1st ice prediction workshop results
TRANSCRIPT
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1st Ice Prediction Workshop ResultsAnsys / Bombardier
Isik OzcerAlberto PueyoShezad NilamdeenYue ZhangHabib FouladiCristhian AliagaShoaib ShahJeya Selva
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Ansys in-flight icing simulation methodology
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Ansys in-flight icing simulation methodology overview
Initial CAD/Mesh, unstructured
Air flow, RANS, sand-grain roughness, HTC
Droplet flow, Eulerian,Size distributions
Wall film flow & icing for ∆t, Ice roughness & ice shapes
RemeshingAero analysis, 3D printingMultishot iterations:
Fully automatedSame grids for all solversUser-free remeshing
Boundary/initial condition update
1 shot of icing simulation
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ICE3D: ice accretion and runback module
Qice
Qimp
QevapQconv
Qcond
roughness, turbulence
Transient FVM
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Solvers and settings used for the workshop
• RANS solver: FENSAP- Compressible, Finite element method- Spalart-Allmaras with sand-grain roughness
(0.5mm, 1mm)- Steady-state, CFL, 300-400 iterations
• Droplet flow solver: DROP3D- Finite element method- Steady-state, CFL, 100-200 iterations- Customizable size distributions- SLD modeling
• Breakup: Pilch & Erdman • Splashing & Bouncing: Mundo• Runback water and bouncing droplet reinjection
• Icing and runback: ICE3D- Finite volume method- Transient with automatic time step size- Constant and variable ice density (beta 21R2)
• Multi-shot - Remeshing: Fluent Meshing- Mesh resolution:
• 1mm minimum edge size• 5-deg max face-to-face
- Number of shots = 10
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Collection efficiency cases
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Collection efficiency: Horizontal tail
Case 111: MVD 21, 27-bin Case 112: MVD 92, 27-bin
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Collection efficiency: Multi-element airfoil
Case 121:MVD 21 27-bin
Case 122:MVD 9227-bin
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Collection efficiency: Nacelle
Case 131:Low mass flow
Case 132:High mass flow
A B C D E
A B C D E
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2D Icing cases
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2D NACA 23012 resultsFENSAP-ICEExperiment
Case 242Ts = 266KMVD = 15µm LWC = 0.8 g/m3
V = 103 m/sτ = 5 minρice = 917 kg/m3
Case 241Ts = 250KMVD = 30µm LWC = 0.4 g/m3
V = 103 m/sτ = 5 minρice = 917 kg/m3
18-inch NACA 23012
Case 251Ts = 261KMVD = 22µm LWC = 1.6 g/m3
V = 103 m/sτ = 6.6 minρice = 779 kg/m3
Case 252Ts = 261KMVD = 22µm LWC = 1.6 g/m3
V = 103 m/sτ = 6.6 minρice = 776 kg/m3
72-inch NACA 23012
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3D Icing cases
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Swept NACA 0012 MCCS, constant ice density (experimental)
Case 361Ts = 257KMVD = 35µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 minρice = 538 kg/m3
Case 362Ts = 266KMVD = 35µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 minρice = 459 kg/m3
Case 363Ts = 263KMVD = 21µm LWC = 0.5 g/m3
V = 115 m/sτ = 18 minρice = 620 kg/m3
Case 364Ts = 260KMVD = 21µm LWC = 0.5 g/m3
V = 114 m/sτ = 18 minρice = 660 kg/m3
Case 371Ts = 257KMVD = 32µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 minρice = 437 kg/m3
Case 372Ts = 266KMVD = 32µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 minρice = 402 kg/m3
FENSAP-ICEExperiment
30o swept NACA 0012 45o swept NACA 0012 30o swept NACA 0012
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Variable ice density model (case 362)
ρice = 917 kg/m3
Solver setting variations, roughness, shot length, mesh size, etc.
Void Density (AIAA-2014-2200)Void Density (AIAA-2014-2200)
Void density
Impact ice density
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Case 361Ts = 257KMVD = 35µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 minρice = 538 kg/m3
Case 371Ts = 257KMVD = 32µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 min
Case 362Ts = 266KMVD = 35µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 min
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Swept NACA 0012 MCCS, variable ice density
Case 361Ts = 257KMVD = 35µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 min
Case 363Ts = 263KMVD = 21µm LWC = 0.5 g/m3
V = 115 m/sτ = 18 min
Case 364Ts = 260KMVD = 21µm LWC = 0.5 g/m3
V = 114 m/sτ = 18 min
Case 372Ts = 266KMVD = 32µm LWC = 0.5 g/m3
V = 103 m/sτ = 20 min
FENSAP-ICEExperiment
30o swept NACA 0012 45o swept NACA 0012 30o swept NACA 0012
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Swept wing numerical ice shape (case 362)
10-shot, 1.0mm mesh 20-shot, 1.0mm mesh 40-shot, 1.0mm mesh 20-shot, 0.7mm mesh
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Swept wing numerical ice shape (case 362)
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Closing remarks
• SLD modeling needs work- Bouncing criteria- Sensitivity to droplet temperature through water viscosity- Numerical experiments, VoF & SPH methods, machine learning for data reduction
• Ice density modeling- Strong factor- Variable density is the way to go, could be better – research opportunity!
• Multi-shot step size- More shots bring out more details in the ice shape- How can it be automated, with some “resolution” dial?
• Future workshop ideas- Performance degradation analysis on the ice shapes created by participants in IPW1 (exp. possible)- Less cases please, deep dive into methods, modeling
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Additional slides
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Horizontal tail Cp
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Three Element Airfoil
High Lift, Three Element AirfoilStructured mesh (created using ICEM CFD) (BKFINEGRID)480,798 nodes238.936 hexahedral cells
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Three element airfoil Cp
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Case-131: Surface Mach
Reference: NASA CR 4257
Optional
Calculated using P-total at test section inlet
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Reference: NASA CR 4257
Optional
Calculated using P-total at test section inlet
Case-132: Surface Mach
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Case-362 – variations
k=0.5 k=0.2 k=0.5, LangD k=0.5, gravity k=0.5, mesh 0.0007 k=0.5, mesh 0.0013k=0.5, mesh 0.0013, Jones Glaze