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[snappyHexMesh] Multi Layers SnappyHexMesh

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Old   March 28, 2019, 09:26
Default Multi Layers SnappyHexMesh
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Edoardo
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Good Morning everybody,



I am Edoardo and I am currently working on the Ahmed Body. Right now I am trying to give different setting for the layers in snappy but I do not know why nothing happened; it seems like the local parameters that I gave to in the Dict were not red.



In particular I want to give different layer specification ( such as n of layers, expansion ratio and the final layer thickness) to different patches. I hope it is possible to do that in snappy.



This is what I wrote in my snappyDict for the layers:



addLayersControls
{
// Are the thickness parameters below relative to the undistorted
// size of the refined cell outside layer (true) or absolute sizes (false).
relativeSizes true;

//GLOBAL PARAMETERS

// Expansion factor for layer mesh
expansionRatio 1.3;

// Wanted thickness of final added cell layer. If multiple layers
// is the thickness of the layer furthest away from the wall.
// Relative to undistorted size of cell outside layer.
// See relativeSizes parameter.
finalLayerThickness 0.53;

// Minimum thickness of cell layer. If for any reason layer
// cannot be above minThickness do not add layer.
// Relative to undistorted size of cell outside layer.
minThickness 0.08;

// Per final patch (so not geometry!) the layer information
layers
{
"Ahmed_patch0|Ahmed_patch2|Ahmed_patch4|Ahmed_patc h6|Ahmed_patch8|Ahmed_patch9|"
{
//LOCAL PARAMETERS
nSurfaceLayers 5;
expansionRatio 1.3;
finalLayerThickness 0.53;

}


"groundWall"
{
//LOCAL PARAMETERS
nSurfaceLayers 5;
expansionRatio 1.3;
firstLayerThickness 0.09;
}


}



Thanks in advance,


Edoardo.
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Old   March 28, 2019, 11:03
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Lucky Tran
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As a workaround, you can try running snappy more than once, each time with a different snappyHexMeshDict.
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layer addition, openfoam, snappy hex mesh

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