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April 22, 2012, 12:47 |
Volume mesh smoothing problem -DLR F6
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#1 |
Senior Member
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Dear All
Right now I am practicing the prism-tetra part of ICEM. I am practicing ICEM 14 Workshop tutorials and geometry is DLR F6. I am sucessful in creating all steps e.g. shell meshing, volume mesh, prism, density box and smoothing tet-4 elements. But I am stuck in volume meshing step for quad-4, penta-4, tri-3 and as per insturction I have applied smoothing twice but nothing happens. Any one can suggest me, where I am getting it wrong. This is what I get: This is what, should be achieved: http://img515.imageshack.us/img515/5...rf6correct.png Last edited by wyldckat; September 3, 2015 at 19:06. Reason: disabled embedded images |
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April 23, 2012, 05:12 |
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#2 |
Senior Member
Christoph
Join Date: May 2011
Location: Germany
Posts: 182
Rep Power: 18 |
I can't see the attached pics!?
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April 23, 2012, 06:22 |
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#3 |
Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 739
Rep Power: 26 |
The way I meshed this airfame (well the Common Research Model, but there very similar) was to first set-up the surface, volume and density region sizings based in the Octree criteria. Then I deleted the volume elements and smoothed the surface triangles until they would not improve any further (but I never used the laplace smoother as I found it made things worse). From that surface mesh I used the Delaunay (with TGlib/Use AF option switched on) to re-fill the volume. Again, I smoothed the volume tetras until no further improvment (no laplace again). Next I generated the prism layers to keep layering until it reached a smooth volume transition to the nearby tetras. The make a few floating prism layers and spliting/re-distributing does suit for this job I found. Then I smoothed it (sometimes freezing the penta elements). I did end up with pyramid elements due to the prism layers.
When smoothing the final mesh I freeze the pentas and aim to get a qualilty > 0.3. When I un-freezed the pentas I only smoothed up to 0.1 or it may have been lower. I used ICEM v 13. As this was over 1 year ago so options my be different to v 14. I made posts with pictures asking for help with his mesh and PSYMN gave a loads of useful tips. I biggest issue I found making a hybrid mesh was I could not get a fine resolution on the blunt trailing edges without getting a very high element total so I under resolved it with only 1 or 2 elements on the trailing edge height. Hexa does not have this issue. |
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April 23, 2012, 07:27 |
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#4 |
Senior Member
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Thanks for help. I shall try this method for this model as well.
But at the moment, I am following the tutorial and I assume that I should get what is depicted in tutorial. I am going to attach the files with shell meshing and volume meshing with/without smoothing. Thankyou again for your helpful hints and consideration. |
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