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[snappyHexMesh] Boundary Layer on a lower wall

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Old   March 3, 2019, 09:16
Default Boundary Layer on a lower wall
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Federica Fregosi
Join Date: Mar 2019
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Hi everyone,

I have a problem with the generation of a boundary layer on a wall. I am using the snappyHexMesh utility to define my domain around a rudder, and it works on it (it generates the layers and so on). This rudder lays on the lower wall. Now, I am trying to create layers on this lower wall, but I am not sure I am correct.
At first I did this:

relativeSizes false;
layers
{
rudder
{
nSurfaceLayers 5;
}
lowerWall
{
nSurfaceLayers 5;
}
}
expansionRatio 1.5;
thickness 0.016;
minThickness 0.0001;

But it does not cover all the lower wall (just the refined region).
So, I added a new snappyHexMesh just for the lower wall, and in this way it covers all the lower wall but…the simpleFoam does not work! (In the previous way simpleFoam works, but I am not sure it generates the correct results).
Obviously, I changed all the boundary conditions (based on the motorBike case):
- In the blockMeshDict lowerWall is type wall
- K
lowerWall
{
type kqRWallFunction;
value $internalField;
}
- nut
lowerWall
{
type nutkWallFunction;
value uniform 0;
}
- omega
lowerWall
{
type omegaWallFunction;
value $internalField;
}
- p
lowerWall
{
type zeroGradient;
}
- U
lowerWall
{
type noSlip; /*fixedValue;
value $internalField;*/
}
In the U conditions I have tried both types.

Then, I have tried to understand the motorBike case but it is not clear, for example, the wallBoundedStreamLines dictionary.

Any suggestions?
Thanks,

Best regards
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boundary layer, snappyhesmeshdict, wall

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