[kingmaker]

I am trying to simulate a cylinder in flow problem (2D).

Case 1 :

Flow around a cylinder 
Turbulence Model : LES (all default values)
Wall Function : nutUSpaldingWallFunction (for nuSgs)
solver : pimpleFoam

Case 2 :

All physics same as Case 1. 
No Displacement on the mesh
solver : pimpleDyMFoam

OpenFOAM version 2.2.1

I know the Turbulence models LES should not have any effect in 2D case, I setup a generic 3D case.

Now when I plot the forces(Lift and Drag) on the cylinder they are completely different.
Here I am posting the plots. I am totally confused. I am doing this because I want to use the pimpleDyMFoam for FSI simulations (because of mesh motion possibility). So I want to make sure that pimpleDyMFoam, with mesh motion set to 0 on relevant patches, gives same result as pimpleFoam . But apparently this is not the case.

Any hints to as what is happening is really helpful.

[imamwfgf]

Hi Aditya,

Did you ever solve this problem? In my case, my pimpleFoam results converges smoothly while pimpleDyMFoam with no mesh motion diverged after 10-20 iterations.