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mesh within certain angles

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Old   June 8, 2011, 15:52
Default mesh within certain angles
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Hey guys,

How to deal with mesh in the sharp angle area as marked in the attached picture? The problem is that the room becomes narrower when it approaches the thinner corner.

The skewness angle there is very large. Is there any tool in the starccm I can use to solve this problem?

Thanks for any help!
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File Type: jpg mesh within the angle.jpg (21.2 KB, 30 views)
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Old   June 10, 2011, 13:51
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If your issue is specifically with a prism layer in that area, you can try changing the layer reduction percentage and minimum thickness percentage under the prism layer mesher options.
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Old   June 10, 2011, 15:21
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Quote:
Originally Posted by daveatstyacht View Post
If your issue is specifically with a prism layer in that area, you can try changing the layer reduction percentage and minimum thickness percentage under the prism layer mesher options.
Thanks but what I'm concerning now is not the prism layer but the mesh in that area. Do you have any idea of how to deal with the sharp angles?
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Old   June 11, 2011, 07:03
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Perhaps try refining either the surface or the volume cells using a volume control? You could also refine it and modify your geometry to eliminate the corner's point such that the if the modification is very minor it will have minimal impact on the resulting flow. I am not sure how important capturing the flow in the smaller end of the corner is to capturing your flow without knowing the details of what you are trying to capture.
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Old   June 11, 2011, 10:27
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Quote:
Originally Posted by daveatstyacht View Post
Perhaps try refining either the surface or the volume cells using a volume control? You could also refine it and modify your geometry to eliminate the corner's point such that the if the modification is very minor it will have minimal impact on the resulting flow. I am not sure how important capturing the flow in the smaller end of the corner is to capturing your flow without knowing the details of what you are trying to capture.
A good way to accomplish the above is to use the feature curve ont he corner to make a smaller surface mesh. Change your growth ratio so that the cells grow more slowly away from the small line source.
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Old   June 15, 2011, 15:29
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Originally Posted by rwryne View Post
A good way to accomplish the above is to use the feature curve ont he corner to make a smaller surface mesh. Change your growth ratio so that the cells grow more slowly away from the small line source.
Thanks. I'm interested in the feature curve way. Could you please explain more in detail about how to use it to control the surface mesh in that area? Thanks.
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Old   June 15, 2011, 15:31
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Quote:
Originally Posted by daveatstyacht View Post
Perhaps try refining either the surface or the volume cells using a volume control? You could also refine it and modify your geometry to eliminate the corner's point such that the if the modification is very minor it will have minimal impact on the resulting flow. I am not sure how important capturing the flow in the smaller end of the corner is to capturing your flow without knowing the details of what you are trying to capture.
It's not the major part and I have no idea about its impact on the flow. What I know is it couldn't be converged when the skewness angle is around 132 degree. Currently it still has a 92 degree. But anyway, thanks for your reply.
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