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Problem : Cell expansion ratio (blockMeshDict) |
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July 16, 2012, 07:16 |
Problem : Cell expansion ratio (blockMeshDict)
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#1 |
New Member
Seon Hye
Join Date: Feb 2012
Location: South Korea
Posts: 18
Rep Power: 14 |
Hi, guys.
I try to make my mesh for simulating 2D flow over the airfoil using blockMesh, so I compiled my blockMeshDict file. But when I check in paraView, I got a problem that the mesh is twisted. First, I inputted small expansion ratio about 20 in normal direction to the airfoil surface, and there is no problem. And then, I increased the expansion ratio (about 100). blockMesh was good working and no error existed. However, in paraView, The mesh had big trouble. I attach a part of my blockMeshDict (related to definition of block) and picture about bad mesh. How can I resolve it? PHP Code:
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July 16, 2012, 09:53 |
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#2 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 21 |
What is the output of checkMesh?
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July 16, 2012, 10:28 |
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#3 |
New Member
Seon Hye
Join Date: Feb 2012
Location: South Korea
Posts: 18
Rep Power: 14 |
The output of checkMesh is
PHP Code:
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July 16, 2012, 11:17 |
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#4 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 21 |
Only thing I get think of is the writePrecision in controlDict, maybe you want to set that to a larger value.
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July 16, 2012, 11:28 |
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#5 |
New Member
Seon Hye
Join Date: Feb 2012
Location: South Korea
Posts: 18
Rep Power: 14 |
Thank you for your advice
Unfortunately, I can not correct my problem with your suggestion. I increased writePrecision till 20, but results of the mesh that I can see in paraView are all the same. Do you need more information to resolve this trouble? |
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July 16, 2012, 11:33 |
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#6 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 21 |
Than you should share everything one needs to reproduce the problem, so that we can try ourselves.
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July 16, 2012, 11:47 |
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#7 |
New Member
Seon Hye
Join Date: Feb 2012
Location: South Korea
Posts: 18
Rep Power: 14 |
I can not understand this problem.
SAME blockMeshDict file, but Different expension ratio. For the small expansion ratio, there is no matter. For the bigger expansion ratio, there is bad results. First, I'll try more things by myself. If I do not find a solution, I'll upload blockMeshDict. Once again, I heartily thank you for your advice |
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July 18, 2012, 00:31 |
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#8 |
New Member
Seon Hye
Join Date: Feb 2012
Location: South Korea
Posts: 18
Rep Power: 14 |
Bernhard, I decided to make a blockMeshDict file again with different structure for blocks.
Last edited by ysh1227; July 18, 2012 at 04:35. |
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July 22, 2012, 09:39 |
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#9 |
New Member
Seon Hye
Join Date: Feb 2012
Location: South Korea
Posts: 18
Rep Power: 14 |
.Bernhard, I decided to make a blockMeshDict file again with different structure for blocks.
Last edited by ysh1227; July 22, 2012 at 11:01. |
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September 10, 2012, 04:56 |
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#10 |
Senior Member
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Can you please attach your whole blockMeshDict, so that we can have a look of that.
It can be problem with your blockMeshDict. Siva |
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September 10, 2012, 05:12 |
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#11 |
New Member
Seon Hye
Join Date: Feb 2012
Location: South Korea
Posts: 18
Rep Power: 14 |
I resolve my problem.
Output of my blockMeshDict shows some errors about the order of definition of block. But the mesh has no errors in paraView. So I thought that is not critical and continued my calculation. When I use simpleFoam, the calculation is perfect. Thank you for your concern. |
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