[arslanadeel]

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

[Bloerb]

High velocity is relative. Which medium is it? And what is the mach number of the flow?

[arslanadeel]

Hi

I am using air and Mach no is 0.5.

[Bloerb]

Are you using the transsonic switch? Which schemes are you using? What is the mesh quality like? What are your relaxation factors?

[arslanadeel]

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

[Bloerb]

Try this:

    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.