simulator fire dynamicsfire.fsv.cvut.cz/ifer/2014-training_school/lectures of... · 2014. 3....
TRANSCRIPT
![Page 1: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/1.jpg)
Fire DynamicsSimulator
Wolfram JahnLulea, 13th-15th of March 2014
![Page 2: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/2.jpg)
About FDSDeveloped by Kevin McGrattan at NIST for examining fire andsmoke movement in enclosed spaces such as atria, exhibitionhalls, warehouses, tunnels, etc
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![Page 3: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/3.jpg)
About FDSDeveloped by Kevin McGrattan at NIST for examining fire andsmoke movement in enclosed spaces such as atria, exhibitionhalls, warehouses, tunnels, etc
FDS consists of
− Navier-Stokes solver
![Page 4: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/4.jpg)
About FDSDeveloped by Kevin McGrattan at NIST for examining fire andsmoke movement in enclosed spaces such as atria, exhibitionhalls, warehouses, tunnels, etc
FDS consists of
− Navier-Stokes solver
− Turbulence Model
![Page 5: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/5.jpg)
About FDSDeveloped by Kevin McGrattan at NIST for examining fire andsmoke movement in enclosed spaces such as atria, exhibitionhalls, warehouses, tunnels, etc
FDS consists of
− Navier-Stokes solver
− Turbulence Model
− Combustion Model
![Page 6: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/6.jpg)
About FDSDeveloped by Kevin McGrattan at NIST for examining fire andsmoke movement in enclosed spaces such as atria, exhibitionhalls, warehouses, tunnels, etc
FDS consists of
− Navier-Stokes solver
− Turbulence Model
− Combustion Model
− Radiation Model
![Page 7: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/7.jpg)
About FDSDeveloped by Kevin McGrattan at NIST for examining fire andsmoke movement in enclosed spaces such as atria, exhibitionhalls, warehouses, tunnels, etc
FDS consists of
− Navier-Stokes solver
− Turbulence Model
− Combustion Model
− Radiation Model
− Boundary heat transfer
![Page 8: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/8.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Change of mass inControl Volume
![Page 9: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/9.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Incoming/Outgoingmass
![Page 10: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/10.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Produced mass
![Page 11: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/11.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Change of momentumin Control Volume
![Page 12: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/12.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Inertia
![Page 13: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/13.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Pressure difference(external force)
![Page 14: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/14.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Gravity
![Page 15: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/15.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Some external force
![Page 16: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/16.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Shear forces
![Page 17: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/17.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Energy Conservation∂∂t (ρh) +∇ · ρhu = Dp
Dt + q′′′ −∇ · q′′
Change of energy inControl Volume
![Page 18: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/18.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Energy Conservation∂∂t (ρh) +∇ · ρhu = Dp
Dt + q′′′ −∇ · q′′
Incoming/Outgoingenergy by convection
![Page 19: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/19.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Energy Conservation∂∂t (ρh) +∇ · ρhu = Dp
Dt + q′′′ −∇ · q′′
Pressure changes
![Page 20: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/20.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Energy Conservation∂∂t (ρh) +∇ · ρhu = Dp
Dt + q′′′ −∇ · q′′
Energy production
![Page 21: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/21.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Energy Conservation∂∂t (ρh) +∇ · ρhu = Dp
Dt + q′′′ −∇ · q′′
Incoming/Outgoingenergy by radiation
![Page 22: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/22.jpg)
About FDSNavier-Stokes:
Mass Conservation∂ρ∂t +∇ · ρu = m′′′b
Momentum Conservation∂∂t (ρu) +∇ · ρuu +∇p = ρg + f b +∇ · τ ij
Energy Conservation∂∂t (ρh) +∇ · ρhu = Dp
Dt + q′′′ −∇ · q′′
Gas Equation (for closure)p = ρRspecT
![Page 23: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/23.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
![Page 24: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/24.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
![Page 25: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/25.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:
![Page 26: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/26.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:→ Large eddies are solved directly.
![Page 27: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/27.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:→ Large eddies are solved directly.→ Subscale eddies are approximated (Smagorinsky).
![Page 28: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/28.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:→ Large eddies are solved directly.→ Subscale eddies are approximated (Smagorinsky).
• Mixture fraction combustion model:
![Page 29: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/29.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:→ Large eddies are solved directly.→ Subscale eddies are approximated (Smagorinsky).
• Mixture fraction combustion model:→ Infinite rate combustion.
![Page 30: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/30.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:→ Large eddies are solved directly.→ Subscale eddies are approximated (Smagorinsky).
• Mixture fraction combustion model:→ Infinite rate combustion.
• Two approaches to model a fire:
![Page 31: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/31.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:→ Large eddies are solved directly.→ Subscale eddies are approximated (Smagorinsky).
• Mixture fraction combustion model:→ Infinite rate combustion.
• Two approaches to model a fire:→ Prescribed HRR.
![Page 32: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/32.jpg)
About FDS• FDS solves a simplified version of Navier-Stokes, appropiate
for slow, buoyancy driven flows.
• Finite difference discretisation on a rectangular grid.
• Large Eddy Simulation (or DNS if required) for turbulences:→ Large eddies are solved directly.→ Subscale eddies are approximated (Smagorinsky).
• Mixture fraction combustion model:→ Infinite rate combustion.
• Two approaches to model a fire:→ Prescribed HRR.→ "Fire spread".
![Page 33: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/33.jpg)
About FDS
• Free (download it from https://code.google.com/p/fds-smv/).
![Page 34: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/34.jpg)
About FDS
• Free (download it from https://code.google.com/p/fds-smv/).
• Very easy to use (after this you’ll be ready to go).
![Page 35: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/35.jpg)
About FDS
• Free (download it from https://code.google.com/p/fds-smv/).
• Very easy to use (after this you’ll be ready to go).
• If used with caution, very powerful tool.
![Page 36: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/36.jpg)
About FDS
• Free (download it from https://code.google.com/p/fds-smv/).
• Very easy to use (after this you’ll be ready to go).
• If used with caution, very powerful tool.
• But potentially dangerous if miss-used, or used withoutproper analysis of the results
![Page 37: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/37.jpg)
About FDS
• Free (download it from https://code.google.com/p/fds-smv/).
• Very easy to use (after this you’ll be ready to go).
• If used with caution, very powerful tool.
• But potentially dangerous if miss-used, or used withoutproper analysis of the results→ e.g. Sprinkler - Fire interaction DOES NOT WORK!!
![Page 38: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/38.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
![Page 39: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/39.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
• Most of them require advanced knowledge of fire dynamics andnumerical methods.
![Page 40: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/40.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
• Most of them require advanced knowledge of fire dynamics andnumerical methods.
• All of them come with a default.
![Page 41: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/41.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
• Most of them require advanced knowledge of fire dynamics andnumerical methods.
• All of them come with a default...so you don’t have to adjust them.
![Page 42: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/42.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
• Most of them require advanced knowledge of fire dynamics andnumerical methods.
• All of them come with a default...so you don’t have to adjust them.
• FDS offers many features that do not really work (fire spread,sprinklers).
![Page 43: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/43.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
• Most of them require advanced knowledge of fire dynamics andnumerical methods.
• All of them come with a default...so you don’t have to adjust them.
• FDS offers many features that do not really work (fire spread,sprinklers).
• There is no general grid convergence!!
![Page 44: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/44.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
• Most of them require advanced knowledge of fire dynamics andnumerical methods.
• All of them come with a default...so you don’t have to adjust them.
• FDS offers many features that do not really work (fire spread,sprinklers).
• There is no general grid convergence!!
• Non-physical phenomena are common, but are often not recognized.
![Page 45: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/45.jpg)
Use FDS carefully...• Hundreds of parameters that can be adjusted.
• Most of them require advanced knowledge of fire dynamics andnumerical methods.
• All of them come with a default...so you don’t have to adjust them.
• FDS offers many features that do not really work (fire spread,sprinklers).
• There is no general grid convergence!!
• Non-physical phenomena are common, but are often not recognized.→ Example: Burning at openings.
![Page 46: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/46.jpg)
Use FDS carefully...
General Rule: GIGO!
![Page 47: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/47.jpg)
Use FDS carefully...
General Rule: GIGO!
Garbage In – Garbage Out
![Page 48: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/48.jpg)
How does FDS work?
FDS
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How does FDS work?
Input file (plain text): MyModel.fds
FDS
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How does FDS work?
Input file (plain text): MyModel.fds
FDSLots of time..
![Page 51: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/51.jpg)
How does FDS work?
Input file (plain text): MyModel.fds
FDSLots of time..
![Page 52: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/52.jpg)
How does FDS work?
Input file (plain text): MyModel.fds
FDSLots of time..
Output(massive)
![Page 53: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/53.jpg)
Creating an Input File
• Plain text file. Any text editor will do..
![Page 54: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/54.jpg)
Creating an Input File
• Plain text file. Any text editor will do..
• Grid, geometry and boundary conditions are defined here.
![Page 55: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/55.jpg)
Creating an Input File
• Plain text file. Any text editor will do..
• Grid, geometry and boundary conditions are defined here.
• Use an existing input file rather than creating a new onefrom scratch.
![Page 56: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/56.jpg)
Creating an Input File
• Plain text file. Any text editor will do..
• Grid, geometry and boundary conditions are defined here.
• Use an existing input file rather than creating a new onefrom scratch.
• A valid line starts with an ’&’ – any line without it will notbe taken into account.
![Page 57: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/57.jpg)
Creating an Input File
• Plain text file. Any text editor will do..
• Grid, geometry and boundary conditions are defined here.
• Use an existing input file rather than creating a new onefrom scratch.
• A valid line starts with an ’&’ – any line without it will notbe taken into account.
• A valid line has to finish with a ’\’.
![Page 58: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/58.jpg)
Creating an Input File
CHID – Naming the input file:
// Setup of FDS file&HEAD CHID=’First Example’, TITLE=’First Try’ /
![Page 59: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/59.jpg)
Creating an Input File
The computational domain and grid:
// Setup of FDS file&HEAD CHID=’First Example’, TITLE=’First Try’ /
// Grid spacing&MESH IJK=120,192,40, XB=0.0,12.0,0.0,19.0,0.0,4.0 /
![Page 60: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/60.jpg)
Creating an Input File
The computational domain and grid:
// Setup of FDS file&HEAD CHID=’First Example’, TITLE=’First Try’ /
// Grid spacing&MESH IJK=120,192,40, XB=0.0,12.0,0.0,19.0,0.0,4.0 /
XB = xi, xf , yi, yf , zi, zf
![Page 61: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/61.jpg)
Creating an Input File
Simulation time:
// Setup of FDS file&HEAD CHID=’First Example’, TITLE=’First Try’ /
// Grid spacing&MESH IJK=120,192,40, XB=0.0,12.0,0.0,19.0,0.0,4.0 /
// Simulation time&TIME T_END=10. /
![Page 62: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/62.jpg)
Creating an Input File
Simulation time:
// Setup of FDS file&HEAD CHID=’First Example’, TITLE=’First Try’ /
// Grid spacing&MESH IJK=120,192,40, XB=0.0,12.0,0.0,19.0,0.0,4.0 /
// Simulation time&TIME T_END=10. / if set to 0, only geometry is checked.
![Page 63: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/63.jpg)
Creating an Input File
Miscellaneous:
// General Parameters&MISC SURF_DEFAULT=’CONCRETE’, RADIATION=.FALSE.,TMPA=25.,
RESTART=.TRUE. /
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Creating an Input File
Control:
// General Parameters&MISC SURF_DEFAULT=’CONCRETE’, RADIATION=.FALSE.,TMPA=25.,
RESTART=.TRUE. /
// Control Parameters&DUMP DT_RESTART=100.,NFRAMES=1800 /
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Creating an Input File
Control:
// General Parameters&MISC SURF_DEFAULT=’CONCRETE’, RADIATION=.FALSE.,TMPA=25.,
RESTART=.TRUE. /
// Control Parameters&DUMP DT_RESTART=100.,DT_DEVC=5.,DT_SLCF=10. /
![Page 66: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/66.jpg)
Defining the Geometry
Obstacles:Walls, furniture, doors etc. are all defined using rectangleblockages
![Page 67: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/67.jpg)
Defining the Geometry
Obstacles:Walls, furniture, doors etc. are all defined using rectangleblockages
// Creating obstacles&OBST XB=6.2,6.4,1.6,6.6,0.0,2.4 /
![Page 68: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/68.jpg)
Defining the Geometry
Obstacles:Walls, furniture, doors etc. are all defined using rectangleblockages
// Creating obstacles&OBST XB=6.2,6.4,1.6,6.6,0.0,2.4 /
from x to x
![Page 69: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/69.jpg)
Defining the Geometry
Obstacles:Walls, furniture, doors etc. are all defined using rectangleblockages
// Creating obstacles&OBST XB=6.2,6.4,1.6,6.6,0.0,2.4 /
from y to y
![Page 70: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/70.jpg)
Defining the Geometry
Obstacles:Walls, furniture, doors etc. are all defined using rectangleblockages
// Creating obstacles&OBST XB=6.2,6.4,1.6,6.6,0.0,2.4 /
from z to z
![Page 71: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/71.jpg)
Defining the Geometry
![Page 72: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/72.jpg)
Boundary Conditions• The obstruction is a boundary condition to the flow (free slip)
![Page 73: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/73.jpg)
Boundary Conditions• The obstruction is a boundary condition to the flow (free slip)
• What about thermal boundary conditions (to calculate heatfluxes, wall temperatures)?
![Page 74: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/74.jpg)
Boundary Conditions• The obstruction is a boundary condition to the flow (free slip)
• What about thermal boundary conditions (to calculate heatfluxes, wall temperatures)?
Surfaces and Materials
&SURF ID=’Wall’,MATL_ID=’Paper’,’Concrete’,THICKNESS=0.001,0.3,BACKING=’EXPOSED’/
![Page 75: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/75.jpg)
Boundary Conditions• The obstruction is a boundary condition to the flow (free slip)
• What about thermal boundary conditions (to calculate heatfluxes, wall temperatures)?
Surfaces and Materials
&SURF ID=’Wall’,MATL_ID=’Paper’,’Concrete’,THICKNESS=0.001,0.3,BACKING=’EXPOSED’/
&MATL ID=’Paper’,CONDUCTIVITY=0.12,SPECIFIC_HEAT=1.172,DENSITY=128./
![Page 76: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/76.jpg)
Boundary Conditions• The obstruction is a boundary condition to the flow (free slip)
• What about thermal boundary conditions (to calculate heatfluxes, wall temperatures)?
Surfaces and Materials
&SURF ID=’Wall’,MATL_ID=’Paper’,’Concrete’,THICKNESS=0.001,0.3,BACKING=’EXPOSED’/
&MATL ID=’Paper’,CONDUCTIVITY=0.12,SPECIFIC_HEAT=1.172,DENSITY=128./
&MATL ID=’Concrete’,CONDUCTIVITY=1.7,SPECIFIC_HEAT=0.75,DENSITY=2400./
![Page 77: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/77.jpg)
Boundary Conditions• SI units.
![Page 78: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/78.jpg)
Boundary Conditions• SI units.
• Every Surface needs an ID associated to it.
![Page 79: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/79.jpg)
Boundary Conditions• SI units.
• Every Surface needs an ID associated to it.
• Can be applied directly to an obstacle (all surfaces havesame ID).
![Page 80: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/80.jpg)
Boundary Conditions• SI units.
• Every Surface needs an ID associated to it.
• Can be applied directly to an obstacle (all surfaces havesame ID).
• Or to a certain part of surface:→ &VENT XB=6.2,6.2,1.6,6.6,0.0,2.4,SURF_ID=’WOOD’\
![Page 81: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/81.jpg)
Boundary Conditions• SI units.
• Every Surface needs an ID associated to it.
• Can be applied directly to an obstacle (all surfaces havesame ID).
• Or to a certain part of surface:→ &VENT XB=6.2,6.2,1.6,6.6,0.0,2.4,SURF_ID=’WOOD’\
• The BCs of the Computational domain have to defined:
![Page 82: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/82.jpg)
Boundary Conditions• SI units.
• Every Surface needs an ID associated to it.
• Can be applied directly to an obstacle (all surfaces havesame ID).
• Or to a certain part of surface:→ &VENT XB=6.2,6.2,1.6,6.6,0.0,2.4,SURF_ID=’WOOD’\
• The BCs of the Computational domain have to defined:// All domain boundaries initially exposed
&VENT MB=’XMIN’,SURF_ID=’OPEN’/&VENT MB=’XMAX’,SURF_ID=’OPEN’/
![Page 83: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/83.jpg)
The Fire• Special case of Boundary Condition
![Page 84: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/84.jpg)
The Fire
SURF ID
• Special case of Boundary Condition
![Page 85: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/85.jpg)
The Fire
SURF ID
• Special case of Boundary Condition
• HRRPUA, RAMP&SURF ID=’MyFire’,HRRPUA=700,RAMP_Q=’MyRamp’\
![Page 86: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/86.jpg)
The Fire
SURF ID
• Special case of Boundary Condition
• HRRPUA, RAMP&SURF ID=’MyFire’,HRRPUA=700,RAMP_Q=’MyRamp’\
&RAMP ID=’MyRamp’,T=0,F=0.0/
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The Fire
SURF ID
• Special case of Boundary Condition
• HRRPUA, RAMP&SURF ID=’MyFire’,HRRPUA=700,RAMP_Q=’MyRamp’\
&RAMP ID=’MyRamp’,T=0,F=0.0/&RAMP ID=’MyRamp’,T=80,F=0.2/
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The Fire
SURF ID
• Special case of Boundary Condition
• HRRPUA, RAMP&SURF ID=’MyFire’,HRRPUA=700,RAMP_Q=’MyRamp’\
&RAMP ID=’MyRamp’,T=0,F=0.0/&RAMP ID=’MyRamp’,T=80,F=0.2/&RAMP ID=’MyRamp’,T=120,F=0.5/
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The Fire
SURF ID
• Special case of Boundary Condition
• HRRPUA, RAMP&SURF ID=’MyFire’,HRRPUA=700,RAMP_Q=’MyRamp’\
&RAMP ID=’MyRamp’,T=0,F=0.0/&RAMP ID=’MyRamp’,T=80,F=0.2/&RAMP ID=’MyRamp’,T=120,F=0.5/&RAMP ID=’MyRamp’,T=150,F=1.0/
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The Fire• Fuel is injected at such rate that, if burnt, produces HRRPUA.
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The Fire• Fuel is injected at such rate that, if burnt, produces HRRPUA
• Adding HRRPUA and TMPIGN to any surface converts it into a firewhen TMPIGN is reached.
![Page 92: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/92.jpg)
The Fire• Fuel is injected at such rate that, if burnt, produces HRRPUA
• Adding HRRPUA and TMPIGN to any surface converts it into a firewhen TMPIGN is reached.→Carful with that!
![Page 93: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/93.jpg)
The Fire• Fuel is injected at such rate that, if burnt, produces HRRPUA
• Adding HRRPUA and TMPIGN to any surface converts it into a firewhen TMPIGN is reached.→Carful with that!
• Alternatively you can prescribe MLRPUA. This will produce injectionof gas at a rate of MLRPUA, which will burn if it finds adequateconditions.
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The Fire• Fuel is injected at such rate that, if burnt, produces HRRPUA
• Adding HRRPUA and TMPIGN to any surface converts it into a firewhen TMPIGN is reached.→Carful with that!
• Alternatively you can prescribe MLRPUA. This will produce injectionof gas at a rate of MLRPUA, which will burn if it finds adequateconditions.
• A radially spreading fire can be prescribed by:&VENT XB=0.0,5.0,1.5,9.5,0.0,0.0,SURF_ID=’FIRE’,
XYZ=1.5,4.0,0.0,SPREAD_RATE=0.03/
![Page 95: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/95.jpg)
The Fire• Fuel is injected at such rate that, if burnt, produces HRRPUA
• Adding HRRPUA and TMPIGN to any surface converts it into a firewhen TMPIGN is reached.→Carful with that!
• Alternatively you can prescribe MLRPUA. This will produce injectionof gas at a rate of MLRPUA, which will burn if it finds adequateconditions.
• A radially spreading fire can be prescribed by:&VENT XB=0.0,5.0,1.5,9.5,0.0,0.0,SURF_ID=’FIRE’,
XYZ=1.5,4.0,0.0,SPREAD_RATE=0.03/
• You can also define pyrolysis parameters and get FDS to mimic a"real" fire.
![Page 96: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/96.jpg)
The Fire• Fuel is injected at such rate that, if burnt, produces HRRPUA
• Adding HRRPUA and TMPIGN to any surface converts it into a firewhen TMPIGN is reached.→Carful with that!
• Alternatively you can prescribe MLRPUA. This will produce injectionof gas at a rate of MLRPUA, which will burn if it finds adequateconditions.
• A radially spreading fire can be prescribed by:&VENT XB=0.0,5.0,1.5,9.5,0.0,0.0,SURF_ID=’FIRE’,
XYZ=1.5,4.0,0.0,SPREAD_RATE=0.03/
• You can also define pyrolysis parameters and get FDS to mimic a"real" fire.→VERY Carful with that!
![Page 97: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/97.jpg)
Other BCs• Mechanical ventilation (i.e. fancoils) can be modelled as air-flow
coming into or leaving the domain.
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Other BCs• Mechanical ventilation (i.e. fancoils) can be modelled as air-flow
coming into or leaving the domain.
• The flow "disappears" ("appears") at the boundary.
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Other BCs• Mechanical ventilation (i.e. fancoils) can be modelled as air-flow
coming into or leaving the domain.
• The flow "disappears" ("appears") at the boundary.
Air supply:
&SURF ID=’SUPPLY’, VEL=-1.2, COLOR=’BLUE’ /&VENT XB=5.0,5.0,1.0,1.4,2.0,2.4, SURF_ID=’SUPPLY’ /
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Other BCs• Mechanical ventilation (i.e. fancoils) can be modelled as air-flow
coming into or leaving the domain.
• The flow "disappears" ("appears") at the boundary.
Air supply:
&SURF ID=’SUPPLY’, VEL=-1.2, COLOR=’BLUE’ /&VENT XB=5.0,5.0,1.0,1.4,2.0,2.4, SURF_ID=’SUPPLY’ /
Exhaust:
&SURF ID=’EXHAUST’, VEL=1.2, COLOR=’RED’ /&VENT XB=5.0,5.0,1.8,3.3,2.0,2.4, SURF_ID=’EXHAUST’ /
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Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:
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Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/
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Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/→ If a volume is given instead of a point, an integrated quantity is
recorded (HRR, Average Temperature)
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Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/→ If a volume is given instead of a point, an integrated quantity is
recorded (HRR, Average Temperature)
• Point "measurements" are recorded in spreadsheet format(CHID_devc.csv)
![Page 105: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/105.jpg)
Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/→ If a volume is given instead of a point, an integrated quantity is
recorded (HRR, Average Temperature)
• Point "measurements" are recorded in spreadsheet format(CHID_devc.csv)
• Devices (DEVC) can also be used to control actions:
![Page 106: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/106.jpg)
Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/→ If a volume is given instead of a point, an integrated quantity is
recorded (HRR, Average Temperature)
• Point "measurements" are recorded in spreadsheet format(CHID_devc.csv)
• Devices (DEVC) can also be used to control actions:→ Smoke detectors, Sprinklers etc.
![Page 107: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/107.jpg)
Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/→ If a volume is given instead of a point, an integrated quantity is
recorded (HRR, Average Temperature)
• Point "measurements" are recorded in spreadsheet format(CHID_devc.csv)
• Devices (DEVC) can also be used to control actions:→ Smoke detectors, Sprinklers etc.
• Add SETPOINT to DEVC line:
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Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/→ If a volume is given instead of a point, an integrated quantity is
recorded (HRR, Average Temperature)
• Point "measurements" are recorded in spreadsheet format(CHID_devc.csv)
• Devices (DEVC) can also be used to control actions:→ Smoke detectors, Sprinklers etc.
• Add SETPOINT to DEVC line:&DEVC XYZ=0,0,0,ID=’Clock’,QUANTITY=’TIME’,SETPOINT=30.,INITIAL_STATE=.TRUE./
![Page 109: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/109.jpg)
Manage the Output• Point "measurements" are obtained by adding "measuring" Devices:→ &DEVC XYZ=2.0,6.4,0.0,QUANTITY=’TEMPERATURE’/→ If a volume is given instead of a point, an integrated quantity is
recorded (HRR, Average Temperature)
• Point "measurements" are recorded in spreadsheet format(CHID_devc.csv)
• Devices (DEVC) can also be used to control actions:→ Smoke detectors, Sprinklers etc.
• Add SETPOINT to DEVC line and link it to other item:&DEVC XYZ=0,0,0,ID=’Clock’,QUANTITY=’TIME’,SETPOINT=30.,INITIAL_STATE=.TRUE./
&OBST XB=...,SURF_ID=’...’,DEVC_ID=’Clock’/
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Manage the Output• Slice Files:
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Manage the Output
Plane parallel to z = 0.45• Slice Files:→ &SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
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Manage the Output• Slice Files:→ &SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
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Manage the Output• Slice Files:→ &SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
• Boundary Files:
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Manage the Output• Slice Files:→ &SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
• Boundary Files:→ &BNDF QUANTITY=’TEMPERATURE’/
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Manage the Output• Slice Files:→ &SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
• Boundary Files:→ &BNDF QUANTITY=’TEMPERATURE’/→ Define BNDF_DEFAULT=.FALSE. on the MISC line in order to avoid
innecessary output.
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Manage the Output• Slice Files:→ &SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
• Boundary Files:→ &BNDF QUANTITY=’TEMPERATURE’/→ Define BNDF_DEFAULT=.FALSE. on the MISC line in order to avoid
innecessary output.→ Define BNDF_OBST=.TRUE. on an OBST line you want to see.
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Manage the Output• Slice Files:→ &SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
• Boundary Files:→ &BNDF QUANTITY=’TEMPERATURE’/→ Define BNDF_DEFAULT=.FALSE. on the MISC line in order to avoid
innecessary output.→ Define BNDF_OBST=.TRUE. on an OBST line you want to see.
• Information contained in the slice files can be exported intospreadsheet format if required (using fds2ascii, which can bedownloaded from the FDS website).
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Finally...• The last line in an FDSv5 input file is ’&TAIL/’:
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Finally...• The last line in an FDSv5 input file is ’&TAIL/’:
&OBST XB=5.6,6.2,5.8,6.6,0.0,2.0,SURF_ID=’WALL’/&OBST XB=5.4,6.2,1.6,5.8,0.0,2.0,SURF_ID=’WALL’/
&SURF ID=’WALL’, MATL_ID=’...’.../
&MATL ID=’...’..../&SLCF PBZ=0.45,QUANTITY=’TEMPERATURE’,VECTOR=.TRUE./
&TAIL/
![Page 120: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/120.jpg)
How to run FDS?• If you run OS X or GNU/Linux, open a terminal.
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How to run FDS?• If you run OS X or GNU/Linux, open a terminal.
• If you run Windows, open cmd window.
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How to run FDS?• If you run OS X or GNU/Linux, open a terminal.
• If you run Windows, open cmd window.
• Change directory to where your input file is (cd/to/your/fds/example/path)
![Page 123: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/123.jpg)
How to run FDS?• If you run OS X or GNU/Linux, open a terminal.
• If you run Windows, open cmd window.
• Change directory to where your input file is (cd/to/your/fds/example/path)
• Once in your working directory run FDS by typing:
![Page 124: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/124.jpg)
How to run FDS?• If you run OS X or GNU/Linux, open a terminal.
• If you run Windows, open cmd window.
• Change directory to where your input file is (cd/to/your/fds/example/path)
• Once in your working directory run FDS by typing:
fds5 inputfile.fds
![Page 125: Simulator Fire Dynamicsfire.fsv.cvut.cz/ifer/2014-Training_school/Lectures of... · 2014. 3. 21. · Fire Dynamics Simulator Wolfram Jahn Lulea, 13th-15th of March 2014. About FDS](https://reader036.vdocuments.site/reader036/viewer/2022071109/5fe481de35ab3b69d5594172/html5/thumbnails/125.jpg)
Let’s try...