[sunweiyi2020]

Hi everyone,

Now, I am doing FSI simulation using openfoam and calculix. And I want to use RBFMeshMotionSolver in solids4foam to deal with the large mesh deformation. I test it with pimpleFoam successfully. But it failed when I conducted a wave-structure case using interfoam with RBF. So I'd like to know whether interFoam can support RBFMeshMotionSolver. If not, could you give me some ideas about how to ingrate RBFMeshMotionSover into interfoam?

[be_inspired]

Hi, could you share some information about the version of openfoam you are using?

[sunweiyi2020]

I used openfoam-v2012 and solid4foam v2.0.

[be_inspired]

I have compiled only RBFMeshMotionSolver from solids4foam ( next release version) . But every time I launch a test in parallel, I obtained the following error.

terminate called after throwing an instance of 'std::bad_alloc'
terminate called after throwing an instance of 'std::bad_alloc'
terminate called after throwing an instance of 'std::bad_alloc'

This is my dynamicMeshDict file:

FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      dynamicMeshDict;
}

dynamicFvMesh dynamicMotionSolverFvMesh;

motionSolverLibs ("libfvMotionSolvers.so" "libRBFMeshMotionSolver.so");

// Radial basis function solver
solver RBFMeshMotionSolver;

RBFMeshMotionSolverCoeffs
{
    // Settings for the RBF solver
    staticPatches    ();
    movingPatches    (tower);
    fixedPatches     (inlet);
    interpolation
    {
        function     TPS;
    }
    coarsening
    {
        enabled      false;
        tol          0.1;
    }
}

I do not want to perform a FSI simulation but use RBF solver for high mesh deformations where the laplacian approach does not work properly.

In serial, the memory usage increase a lot for an hour without doing anything.

Could you confirm that RBF works in parallel?

[xiangxiang]

Hi, I have tested the overPimpleDyMFoam solver in openfoam, and the dynamic mesh uses the RBF mesh motion function of solid4foam. I've tested both serial and parallel, and they all work.

I forgot to mention that my simulation environment is OpenFOAM-Calculix-PreCICE.

[sunweiyi2020]

Hi, I think the number of your mesh is so large that it runs out the memory of your PC. Because RBF method takes up a lot of memory. If you want to use RBF for parallel, you need to decrease the number of mesh or use a better PC. I hope it can help you.

[sunweiyi2020]

Hi xiangxiang,
Did you try RBF when using interfoam? Is it compatible? I tried it and it failed.

[be_inspired]

Originally Posted by sunweiyi2020

Hi, I think the number of your mesh is so large that it runs out the memory of your PC. Because RBF method takes up a lot of memory. If you want to use RBF for parallel, you need to decrease the number of mesh or use a better PC. I hope it can help you.

The mesh size is 2.7M cells I do not think it is so much.

[sunweiyi2020]

If you just want to verify whether it can run in parallel, you can modify the case in solid4foam/tutorials/fluidSolidInteraction/perpendicularFlap. You can find it can run in parallel.