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July 10, 2017, 06:11 |
Layers collapsing
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#1 | |
New Member
Join Date: Apr 2017
Posts: 1
Rep Power: 0 |
Hello foamers,
for my thesis I'm currently working on a simulation of the NASA CRM model (https://commonresearchmodel.larc.nasa.gov/). I'm trying to create the mesh using snappyHexMesh. For reaching my yPlus values, I have to add Layers, but there seems to be some problems with snappyHexMesh: The layers collapse before they reach the tip of the leading edge. I've tried to vary the addLayersControls in my snappyHexMeshDict, with no better results than in the attached screenshot. Here you can see my snappyHexMeshDict: Quote:
Thanks for your help, Max |
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July 10, 2017, 08:51 |
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#2 |
New Member
Join Date: Mar 2015
Posts: 16
Rep Power: 11 |
Hi,
Snappy doesn't work well when the size difference between the last cell of the boundary layer and the first cell of the rest of your mesh is too high. Try to refine a bit more the cells close to the geometry, and it should be ok. |
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July 10, 2017, 11:59 |
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#3 |
Member
Join Date: Nov 2014
Posts: 92
Rep Power: 12 |
Try to set featureAngle in addLayersControl to 180
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July 24, 2017, 08:53 |
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#4 |
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benoit paillard
Join Date: Mar 2010
Posts: 96
Rep Power: 16 |
Try cfmesh. It'll work, guaranteed
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August 14, 2017, 18:47 |
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#5 |
Senior Member
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 25 |
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August 15, 2017, 05:05 |
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#6 |
Member
benoit paillard
Join Date: Mar 2010
Posts: 96
Rep Power: 16 |
My experience is exactly the opposite of what you're saying, but I would be very curious to see examples... thanks !
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October 15, 2021, 06:54 |
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#7 |
New Member
Supakorn Suttiruang
Join Date: Mar 2020
Posts: 8
Rep Power: 6 |
Hi,
Have you been able to successfully generate a good CRM mesh with either snappy or cfMesh? I'm starting to be curious if this is possible at all. One report from the AIAA Drag Prediction Workshop even mentioned that "snappyHexMesh is too poor" for even the coarsest mesh requirement. |
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