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-   -   SolidBodyMotion in RhoCentralDyMFoam (http://www.cfd-online.com/Forums/openfoam-solving/112491-solidbodymotion-rhocentraldymfoam.html)

rmoreno January 29, 2013 22:56

SolidBodyMotion in RhoCentralDyMFoam
 
Hi everyone,

I have been trying to run some simulations moving the whole mesh as a rigid body using pimpleDyMFoam as starting point. I can run simple oscillating cases in pimpleDyMFoam and the results agree with the analytical values (i.e. Theodorsen function for an oscillating airfoil).

I want to move now to rhoCentralDyMFoam, as I have been working with it for a while already. If I deform the mesh, I get similar results to what I was getting in pimpleDyMFoam. However, when I try to move the mesh as a rigid body, rhoCentralDyMFoam still asks for a solver, and even if I provide one I think it is mixing the two approaches.

Taking a look at rhoCentralDyMFoam.c I have seen that it calls motionSolver.H and CreateMesh.H, instead of dynamicFvMesh.H and CreateDynamicFvMesh.H. So, it seems that when it was programmed it was not intended to use all the capabilities available in some other solvers.

Can anybody put some light into this?. I have started to modify the code to make it work with solid body motions, but maybe there was a good reason not to do this at the original time and I might just be wasting my time...

Thanks a lot and best regards

immortality January 30, 2013 06:06

hi
Im going to run a mesh with solid body motion.but i don't know how to start in rhoPimpleFoam.could you send me your case?
Another question i didn't get its answer is abot residualControl in rhoPimpleFoam.whats it's duty when we can set tolerances in related dictionaries in fvSolution?

immortality January 30, 2013 06:07

hi
Im going to run a mesh with solid body motion.but i don't know how to start in PimpleDYMFoam.could you send me your case?
Another question i didn't get its answer is abot residualControl in rhoPimpleFoam.whats it's duty when we can set tolerances in related dictionaries in fvSolution?
Thanks.

rmoreno January 30, 2013 07:27

Quote:

Originally Posted by immortality (Post 404976)
hi
Im going to run a mesh with solid body motion.but i don't know how to start in rhoPimpleFoam.could you send me your case?
Another question i didn't get its answer is abot residualControl in rhoPimpleFoam.whats it's duty when we can set tolerances in related dictionaries in fvSolution?

Hi, I do not know about rhoPimpleFoam, I have never used it, only pimpleDymFoam. This is how the constant/dynamicMeshDict file looks

Code:

dynamicFvMesh      solidBodyMotionFvMesh;

motionSolverLibs ("libfvMotionSolvers.so");

solidBodyMotionFvMeshCoeffs
{

solidBodyMotionFunction oscillatingRotatingMotion;
oscillatingRotatingMotionCoeffs
{
CofG        (0.25 0.007 0.125);
amplitude    (0 0 0.573);
omega            30.;
}
}


immortality January 30, 2013 10:21

sorry.i corrected it.how can specify which cells are moving and which are stationary ones? Could you send me necessary files?thanks.

rmoreno January 30, 2013 19:06

Quote:

Originally Posted by immortality (Post 405051)
sorry.i corrected it.how can specify which cells are moving and which are stationary ones? Could you send me necessary files?thanks.

The dynamicMeshDict file I shared is all you need to move the mesh rigidly, it all moves as a solid. If you want to specify only certain zones I think you need to use AMI, but I have never done it...

immortality January 31, 2013 13:32

2 Attachment(s)
thanks.these show what i want to model.

immortality February 4, 2013 02:47

does anyone could help on how can it be simulated?how to start?

immortality February 5, 2013 15:30

Ruben do you know how can i set in the dictionary you wrote for a linear displacement solid body motion?

rmoreno February 6, 2013 20:06

Quote:

Originally Posted by immortality (Post 406169)
Ruben do you know how can i set in the dictionary you wrote for a linear displacement solid body motion?

It should simply be oscillatingLinearMotion, you can see the dictionary and any other available solidbody functions in

src/dynamicFvMesh/solidBodyMotionFvMesh/solidBodyMotionFunctions/*

immortality February 12, 2013 13:34

thanks.but i dont want oscillating motion.how to set linear constant velocity motion?


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