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[GAMBIT] Problem with boundary layer - high skewness |
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#1 |
New Member
Oleg
Join Date: Feb 2014
Posts: 5
Rep Power: 12 ![]() |
Hello, everyone! I'm asking for help with a GAMBIT problem. Trying to create boundary layer on volume but it results with high skewness.
I don't think it's possible to slice this volume into smaller parts. (Actually it is a part of much more complex case). Trying different surface mesh schemes didn't help as well as trying to change defaults for BLAYER. What I cannot understand is why it doesn't preserve thickness of boundary layer, because even if I managed to reduce skewness <0,97 a layer is still too thin in some areas. I'm out of ideas, please, suggest something... ![]() |
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#2 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
Rep Power: 41 ![]() |
yoou have to be sure that your problem comes from the BL.
For that, delete the BL and mesh your volume. As I see you your surface mesh, I suppose you want to mesh your volume with hexa. With such a topology, you won't be able. You have to split your volume. check this tutorial: https://www.sharcnet.ca/Software/Gam...guide/tg03.htm
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In memory of my friend Hervé: CFD engineer & freerider ![]() |
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#3 |
New Member
Oleg
Join Date: Feb 2014
Posts: 5
Rep Power: 12 ![]() |
Thank you very much for this tutorial. I somehow missed it.
I don't want to mesh this volume with hexa, I only want a hex BL. However now I see it's unlikely to get a good layer without splitting the volume. |
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#4 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
Rep Power: 41 ![]() |
Ok if you don't want hexa volume, mesh your surface mesh with tri elements.
Your BL will be prismatic. It should fix your problem. Then mesh your volume with tet/hexcore (core of your volume with hexaeders)
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In memory of my friend Hervé: CFD engineer & freerider ![]() |
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#5 |
New Member
Oleg
Join Date: Feb 2014
Posts: 5
Rep Power: 12 ![]() |
I tried triangular meshing and it didn't help. I fiured out that increasing mesh density and thickening BL rows can partly resolve the problem. Of course, the right way is to split the volume but I don't have much time so I'll put up wth it, thank you again.
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Tags |
boundary layer, gambit 2.3.16, skewness |
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