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Old   August 18, 2020, 13:17
Default Dynamic Mesh Simulation
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Hi All!

I'm trying to generate a simulation of a rotating mesh that has multiple frames so that it can be played back in Paraview like the Cantilever example in the Structural Mechanics section, but I can't seem to find much information about how to do it.

I tried adding the following sections to the config but I think I'm missing something since the mesh doesn't rotate in Paraview when played back:

HTML Code:
GRID_MOVEMENT= ROTATING_FRAME
 MACH_MOTION= 0.8
MOTION_ORIGIN= 0.25 0.0 0.0
ROTATION_RATE = 9.0 9.0 9.0
TRANSLATION_RATE = 4.0 3.0 0.0
Is there an example config file that can be used as a starting point for this sort of thing?

Thanks!
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Old   August 18, 2020, 13:29
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Hi,
Rotating frame simulations do not move the grid, they just assume the region is rotating without actually moving it, hence the "frozen rotor" designation in the turbomachinery world.
In any case, what you want is rigid motion, of the rotating flavor, see TestCases/sliding_interface/rotating_cylinders/
Cheers.
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Old   August 20, 2020, 20:41
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Thanks for the quick reply, sorry it took me some time to get back to you.
I ran the simulation on the test case, and it's hitting:

HTML Code:
FGMRES orthogonalization failed, linear solver diverged.
After iteration 878.

This is on the latest MPI download for macOS, is this a known issue/expected?

Thanks!

Update: When running non-MPI version it ends with:

HTML Code:
SU2 has diverged. (Residual > 10^20 detected)
After 765 iterations

Last edited by de098; August 20, 2020 at 21:55. Reason: Providing update.
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Old   August 21, 2020, 07:00
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Regression tests are not validation examples.
We use them to detect changes to particular features.
Some are a bit contrived so yeah they may diverge after some iterations...
But I only pointed you to that case so you can get a reference for the required options.
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