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[snappyHexMesh] detached faces on inclined planes |
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December 5, 2014, 16:24 |
detached faces on inclined planes
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#1 |
New Member
Diego
Join Date: Nov 2014
Posts: 8
Rep Power: 11 |
Greetings,
While trying to set up external aerodynamic simulations using snappy I noticed that my wing surfaces were turning out bumpy. After playing with simpler geometries a bit, I isolated this very simple case that exercises such bad behavior: a tilted box inside a blockMesh-ed wind tunnel. If I don't add boundary layers the bumps are stuck to the box. Here with three boundary layers you can see them flying above the surface of the box on the left edge (also along the front edge, but those are more difficult to spot). I'm wondering if I'm doing something obviously wrong, or is this likely to be a bug in snappy? Best, --diego |
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December 6, 2014, 20:35 |
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#2 |
New Member
Diego
Join Date: Nov 2014
Posts: 8
Rep Power: 11 |
Update: false alarm, I am now fairly certain this is actually a bug in paraview.
When I run the flow, the detached patches don't seem to act like a wall, so the parsimonious explanation would be that paraview erroneously assigns some of the internal mesh faces to the patch. |
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December 7, 2014, 16:08 |
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#3 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,975
Blog Entries: 45
Rep Power: 128 |
Greetings Diego and welcome to the forum!
Just a quick question/answer - Try following the instructions given here: http://openfoamwiki.net/index.php/FA...is_in_ParaView - if following those instructions you still see these floating triangles, then you might want to check with checkMesh to see if the mesh is sane or not: Code:
checkMesh -allGeometry -allTopology Bruno
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December 11, 2014, 21:18 |
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#4 |
New Member
Diego
Join Date: Nov 2014
Posts: 8
Rep Power: 11 |
Thanks for the tips Bruno. You were right of course, the mesh ended up broken
after layer addition. I have since turned my attention to cfMesh and am getting beautiful boundary layers this way but the simpleFoam solver tends to blow up with these meshes even with no boundary layers. If you can offer any clues to why this might be, please do! Thanks, Diego |
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December 13, 2014, 16:19 |
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#5 | |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,975
Blog Entries: 45
Rep Power: 128 |
Hi Diego,
Quote:
Yes, it's a clue But a better answer is this - Please follow these instructions: http://www.cfd-online.com/Forums/ope...-get-help.html Best regards, Bruno |
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December 14, 2014, 00:43 |
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#6 | |
New Member
Diego
Join Date: Nov 2014
Posts: 8
Rep Power: 11 |
Quote:
http://www.cfd-online.com/Forums/ope...tml#post523737 |
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