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[mesh manipulation] Is it possible to coarsen the mesh? |
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July 29, 2017, 19:01 |
Is it possible to coarsen the mesh?
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#1 |
Member
Charlie
Join Date: Dec 2010
Location: USA
Posts: 85
Rep Power: 15 |
Hi foamers,
I know it's a bit silly to ask this, but it's interesting that we are all discussing how to refine the mesh in the whole domain or regions of interest, however, I wonder if it's possible to coarsen the mesh in certain regions. This question is especially relevant when we have irregular shape (for example, cylinder, stars, etc) in the domain or along the boundary. We could certainly initialize the region to be coarse and then use refineMesh or snappyHexMesh to obtain a finer mesh. However, the initial shape or BC will be distorted because of the coarse mesh at the first step. So my idea is to use fine mesh initially, and then coarsen the mesh in regions far away from the irregular shape or BC, is this possible? Could you let me know which tool is useful for this purpose? Another idea is to create blocks of different mesh resolutions, but this will be problematic, as blockMesh doesn't know how to connect faces with different number of meshes, I tried to use mergePatchPairs, but this will create two internal patches, which doesn't make sense, because these internal patches act like a boundary patch, and the numerical results are affected by them. Any suggestions? Best Charlie |
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July 30, 2017, 05:44 |
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#2 |
New Member
NISHANT
Join Date: Nov 2016
Posts: 22
Rep Power: 9 |
Bravo to Charlie, yeah it's silly but some people have an habbit to take flying arrow in their ass people like Me, You, Issac Newton.. Let's come to the point well you can set the Mesh coarse, Fine apple, orange anything in ICEM CFD and export it as openfoam format.
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August 2, 2017, 22:02 |
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#3 |
Member
Charlie
Join Date: Dec 2010
Location: USA
Posts: 85
Rep Power: 15 |
Thank you, Nishant, I guess there are a lot of meshing tools out there, like ICEM CFD, gmesh, salome, cfmesh, etc. I've tried a few, and they all have their own pros and cons. I guess, I will invest more time on them when I have a very complicated geometry.
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August 2, 2017, 22:24 |
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#4 |
New Member
NISHANT
Join Date: Nov 2016
Posts: 22
Rep Power: 9 |
Roger that Charlie, please send me the image of complicated geometry. May be I will provide some reinforcement to you.
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August 2, 2017, 22:59 |
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#5 | |
Senior Member
Join Date: Aug 2013
Posts: 407
Rep Power: 15 |
Hi Charlie,
Quote:
Hope this helps. Cheers, Antimony |
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