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Dynamic Mesh Problem - FSI

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Old   September 4, 2024, 05:46
Unhappy Dynamic Mesh Problem - FSI
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Alice Zanella
Join Date: Oct 2019
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Hi everyone,

I'm having some troubles while deforming my mesh during an FSI simulation. The test case is a 2D naca0012 pitching and plunging. I'm using k-omega sst with wall functions and my mesh is unstructured + BL. The problem is that whatever displacementLaplacian method I use, I always end up with a distorsion near the trailing edge and on the pressure side. The crash happens within the first 10-20 timesteps, depending on which diffusivity I choose.

This is my dynamicMeshDict:

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

dynamicFvMesh dynamicMotionSolverFvMesh;

motionSolverLibs ("libfvMotionSolvers.so");

solver      displacementLaplacian;
// OpenFOAM9 or newer: rename "solver" to "motionSolver"

displacementLaplacianCoeffs {
//diffusivity quadratic inverseDistance 1 (airfoil);
// diffusivity  inverseDistance (airfoil);
diffusivity quadratic inverseDistance 1 (airfoil);
// diffusivity     exponential 0.25 inverseDistance (airfoil);
}
I'm also attaching two images: undeformed mesh and last timestep deformation before crashing.

Do you have any ideas how to solve this problem?
Thank you!
Attached Images
File Type: jpg Screenshot from 2024-09-04 10-43-21.jpg (128.6 KB, 8 views)
File Type: jpg Screenshot from 2024-09-04 10-44-04.jpg (127.7 KB, 9 views)
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displacementlaplacian, dynamic mesh, fsi, morphing

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