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-   -   2 zones mesh morphing (to keep the boundary layer) (http://www.cfd-online.com/Forums/openfoam-solving/117537-2-zones-mesh-morphing-keep-boundary-layer.html)

fredo490 May 10, 2013 06:24

2 zones mesh morphing (to keep the boundary layer)
 
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.
http://www.fredo490.fr/public/mesh2zones.PNG

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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