Question: Wall heat flux, and other boundary fields, on an internal thin wall show a pattern or strong variations
Answer:
One possible reason is the underlying thin surface mesh definition, especially the orientation of the face normals. If this is not consistent for the whole surface, then the element faces are partly assigned to either side of the thin surface. The result is correct, but visualization is confusing.
The issue can be seen clearly in ICEM CFD when you open your mesh and in the Model Tree under 'Shell' check the 'Face Normals'. The 'Face Normals' at the surface by default should all point into the volumetric domain. For outer walls this is done automatically but for inner walls this is not done.
The user can change this in ICEM CFD with the option EditMesh --> Reorient Mesh -->Reorient Consistent.
To accurately view the results in CFX-Post, you would need to use the 'Face Culling' under 'Render' to view the variables of the inward and outward facing elements.
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Question: Wall heat flux, and other boundary fields, on an internal thin wall show a pattern or strong variations Answer: One possible reason is the underlying thin surface mesh definition, especially the orientation of the face normals. If this is not consistent for the whole surface, then the element faces are partly assigned to either side of the thin surface. The result is correct, but visualization is confusing. The issue can be seen clearly in ICEM CFD when you open your mesh and in the Model Tree under `Shell` check the `Face Normals`. The `Face Normals` at the surface by default should all point into the volumetric domain. For outer walls this is done automatically but for inner walls this is not done. The user can change this in ICEM CFD with the option EditMesh --> Reorient Mesh -->Reorient Consistent. To accurately view the results in CFX-Post, you would need to use the `Face Culling` under `Render` to view the variables of the inward and outward facing elements. |
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