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2 zones mesh morphing (to keep the boundary layer)

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Old   May 10, 2013, 06:24
Default 2 zones mesh morphing (to keep the boundary layer)
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HECKMANN Frédéric
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Dear everybody,

I'm working on a simulation where I have a deforming wall. It is actually an airfoil with a deforming leading edge (the law depends of the flow condition).

I would like to know if there is a function / tool in OpenFoam (2.2 if possible) able to keep the boundary layer next to the wall intact and send the deformation in the domain.

I know that Fluent uses a 2 zone definition to do so. The first zone next to the wall follow the deformation while the second zone takes the deep compression / extension deformation.


In my case the boundary layer is quite important and I need to use a y+ < 1. I know use this options for the dynamicMeshDict:
Code:
dynamicFvMesh      dynamicMotionSolverFvMesh;

motionSolverLibs ("libfvMotionSolvers.so");

solver            displacementLaplacian;

displacementLaplacianCoeffs
{
    diffusivity       inverseDistance (wall);
}
The problem is that the cells next to the wall are pressed together. The first cell height becomes smaller and smaller and finally it makes a divergence because of negative cells.

Does anybody have experience in this kind of simulation ?
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