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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;
nSurfaceLayers 5;
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
type kqRWallFunction;
value $internalField;
- nut
type nutkWallFunction;
value uniform 0;
- omega
type omegaWallFunction;
value $internalField;
- p
type zeroGradient;
- U
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?

Best regards
fedora is offline   Reply With Quote


boundary layer, snappyhesmeshdict, wall

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