FAQ: Tips on Harpoon Boundary Layer Meshing
Can you give me some pointers in boundary layer meshing using Harpoon?
Here are a few tips for Boundary Layer meshing.
1. Reduce the number of level variations on surfaces where BLs will be
created. Constant sizes are ideal. If several sizes are necessary, limit
this to 1-2, or at most 1-3 levels of change.
2. For STAR-CD, increase from 40 to 50 (or even 60 if user happy to do
3. For larger Boundary Layers, remove hanging nodes or use 100% Tet mesh.
BL Meshing Procedure
1. Assign BL levels to geometry or surface parts. For best results
keep BL below 3 times smallest cell height. No smoothing is required between
meshing and BL creation
2. Smooth at end of meshing. “Smooth all cells” works well.
3. For cells with remaining high skews, try hand-adjustment of nodes, in mesh fixing options, "Adjust Cell Nodes"
4. Compute and display Mesh Quality histogram. Display Worst Skew and hand modify these as desired.
Mesh without BLs first
In some cases, such as internal ones, 2 times or
even 1 times the minimum height should be used
Because Harpoon is very good at creating a mesh on
very complex/dirty geometries, it is easy to forget
that not all geometies are suitable for Boundary Layer
production. Some geometries are almost impossible to
put a boundary layer on due to their complexity.
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