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chtMultiRegionFoam in of6 at High Speeds

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Old   October 2, 2019, 06:27
Default chtMultiRegionFoam in of6 at High Speeds
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Arslan Adeel Ur Rehmann
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Hi everyone!



I am trying to simulation flow over an airfoil using chtMultiRegion v6 at a high velocity 160ms-1. But the issue is the simulation explodes every-time.



I have already tried many things like initializing solution with rhoSimpleFoam, run at low velocity and mapping the solution nothing is working at a velocity above 10ms-1.


Does anyone has experience using chtMultiRegion at high velocities. Would love to hear your comments.



Thanks
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Old   October 2, 2019, 08:27
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High velocity is relative. Which medium is it? And what is the mach number of the flow?
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Old   October 4, 2019, 08:32
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Hi

I am using air and Mach no is 0.5.
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Old   October 4, 2019, 09:00
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Are you using the transsonic switch? Which schemes are you using? What is the mesh quality like? What are your relaxation factors?
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Old   October 4, 2019, 09:26
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I have attached my fvSchemes and fvSolutions files. I am using chtMultiRegionSimpleFoam of5. My mesh quality is

MaSckewness : 0.15
Max Non-orthogonality : 50
max Aspect Ratio : 205
Attached Files
File Type: txt fvSchemes.txt (1.6 KB, 4 views)
File Type: txt fvSolutions.txt (1.8 KB, 2 views)
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Old   October 4, 2019, 09:31
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Try this:
Code:
    div(phi,U)      bounded Gauss upwind;
    div(phi,k)      bounded Gauss upwind;
    div(phi,omega)  bounded Gauss upwind;
    div(phi,h)      bounded Gauss upwind;
    div(phi,K)      bounded Gauss upwind;
    div(phi,Ekp)   bounded Gauss upwind;
If this works you can increase your schemes to second order one by one. Second order in everything is a bit ambitious for coupled energy systems.
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