laser thermal models: prismatic and cylindrical model... · laser thermal models: prismatic and...
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Purdue University : Center for Laser-based Manufacturing
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Laser Thermal Models: Prismatic and Cylindrical
Neil S. Bailey
June 23, 2017
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Purdue University : Center for Laser-based Manufacturing
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Prismatic and Cylindrical
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Purdue University : Center for Laser-based Manufacturing
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Prismatic Model LAMLGUI Prismatic geometry Finite volume method Orthogonal non-uniform mesh Multiple laser profile options Multiple temperature output options Optional features:
Machining with material removal
1D complex geometry along surface
Impinging gas jet Temperature dependent
conductivity and specific heat
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Purdue University : Center for Laser-based Manufacturing
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Prismatic Model Parameters
Overall Parameters
Tool and Jet
Material Property
Workpiece Mesh
Laser Parameters
Temperature Tracking
Complex Geometry
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Purdue University : Center for Laser-based Manufacturing
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Prismatic Model Overall parameters
Machining or heating only
Simulation time parameters
Initial temperatures
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Purdue University : Center for Laser-based Manufacturing
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Prismatic Model Tool and Jet Parameters
Machining:
Tool diameter
laser lead
Impinging jet:
Jet properties
Gas properties
Natural convection coefficient
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Material Properties Density
Emissivity
Reflectivity
Conductivity
Specific heat
Temperature dependent properties are represented by up to 4 polynomials of 5th order.
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Work piece and mesh
Orthogonal mesh
All cells are rectangular, no angles.
Non-uniform mesh
Cell sizes are uniform in fine mesh area, non-uniform outside fine mesh area.
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Laser Parameters
3 laser profiles: Gaussian (most)
Circular (controlled by a 9th order polynomial)
Rectangular (HPDL or non-orthogonal incident angle)
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Temperature tracking
3D domain, 2D surface, point tracking
Cross sections (YZ or XZ) with animations
Slices for 2D steel kinetic model
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Complex geometry parameters
Y, Z coordinates define complex geometry surface profile along X direction.
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Purdue University : Center for Laser-based Manufacturing
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Prismatic Model Input files LAML_parameter.dat main parameter file specify_points.dat used if more than 11 points need to be tracked Output files Open with Tecplot
surface#.dat 2D surface plot 3D_surface_movie.dat 3D surface file showing complex geometry temp3D#.dat 3D domain plot mesh.dat 3D file showing mesh Temperature history of point #.dat x,y plot of single points xz_slice#.dat and yz_slice#.dat Cross-section plots
Other files log.dat iterations and time step data stat#.dat time steps, max temperature, machining data T_restart.dat temperature file saved at the end of each simulation that
can be used to start x_coordinate.dat coordinates of the cell volumes Tmsteps.dat used with steel kinetic model Folders: xz1, xz2, yz1, etc. used with steel kinetic model
Folders must be present for model to run!
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Prismatic Model Useful facts Runs on single core Use MySave, not save icon. Use Windows task manager to kill jobs. Some output files can be used as animation in Tecplot: Animate, Zones
3D_surface_movie.dat, Flux.dat
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Cylindrical Model LAMLGUI Cylindrical geometry Finite volume method Orthogonal non-uniform mesh Up to 2 lasers with multiple
laser profile options Multiple temperature output
options Optional features:
Machining with material removal
1D complex geometry for facing and turning
Impinging gas jet Temperature dependent
conductivity and specific heat
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Cylindrical Model Parameters -> Operating
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Purdue University : Center for Laser-based Manufacturing
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Cylindrical Model Parameters -> Workpiece
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Cylindrical Model Parameters -> Model Control
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Purdue University : Center for Laser-based Manufacturing
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Cylindrical Model
parameters
Machin
Parameters -> BC Conditions
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Cylindrical Model Input files anyname.LAM main parameter file complex#.dat used to define complex geometry Output files Open with Tecplot
surface#.dat 2D surface plot ThreeD#.dat 3D domain plot t_slice#.dat Cross-section plots
Other files log.dat iterations and time step data stats.dat time steps, max temperature, machining data stp.dat temperature at specified points xu.dat, yv.dat, zw.dat coordinates of the cell volumes
Users Manual
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Prismatic and Cylindrical
Questions?
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