[Iman Sengupta]

I have problems associated with meshing of a hydrocyclone. I created the geometry and did meshing in Gambit. I used tetrahedral meshes. I have some skew meshes, having aspect ratio more than 0.9. This skewed meshes are causing trouble during convergence. I tried smoothing of meshes in Gambit but unfortunately number of skewed meshes increased from 3 to 26 for both L-W Laplacian and Equipotential methods of smoothing.

Please help me to solve the problem.

[-mAx-]

post a picture of your geometry

[Iman Sengupta]

There are three skewed meshes at the junction of inlet and cylindrical part of the body of a hydrocyclone. I cannot remove these skewed meshes. This meshes are causing problem with convergence.

[-mAx-]

check here:
http://www.cfd-online.com/Forums/ans...nlet-mesh.html

[Iman Sengupta]

I want to inject feed tangentially to the hydrocyclone. If I change the geometry in the way you are mentioning would I be still able to inject feed tangentially?It may hamper fluid flow pattern inside. Can I do some modification on the meshing?

[-mAx-]

sweep the face in x-direction, but with a small vector, just for preventing the sharp edge.
Then you will have a small edge, but you will fix the issue with a size function

[Iman Sengupta]

I already followed the steps and found that inlet geometry is little bit modified but did not apply size functions. I took small vectors keeping so that flow pattern should not be severely disturbed. Then I did the meshing with slightly changed geometry. Now the meshing is perfect and there are no skewed meshes.I will run the simulations to check if the results are okay with it.

[-mAx-]

you can also split the surface you want to sweep, and then you sweep just the surface next to your sharp angle.
Doing that you will keep your inlet
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