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pimpleFoam Vs pimpleDyMFoam -- Different Results

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Old   November 16, 2016, 12:14
Exclamation pimpleFoam Vs pimpleDyMFoam -- Different Results
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Aditya
Join Date: May 2013
Location: Munich Germany
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I am trying to simulate a cylinder in flow problem (2D).

Case 1 :

Code:
Flow around a cylinder 
Turbulence Model : LES (all default values)
Wall Function : nutUSpaldingWallFunction (for nuSgs)
solver : pimpleFoam
Case 2 :

Code:
All physics same as Case 1. 
No Displacement on the mesh
solver : pimpleDyMFoam
Code:
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.
Attached Images
File Type: png Fx_plot.png (43.5 KB, 21 views)
File Type: png Fy_plot.png (40.1 KB, 22 views)
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Old   April 22, 2017, 02:05
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Will
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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.
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