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[ICEM] Wrong Prism Direction

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Old   May 23, 2011, 08:16
Default Wrong Prism Direction
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Max
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Hi guys,

I'm tying to mesh a duct flow with ICEM Tet and 1 prism wall layer which I then want to split up. This is no problem so far. But when i split the layer to set an initial height, the initial height is set at the volume side, not the wall side. i have done prism mesh before, but never had this error. my material point is inside the volume(tet works perfectly). is there a way to turn direction for prism layers?

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max
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Old   May 24, 2011, 06:45
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jeevan kumar
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please can you post some images to better understand your problem
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Old   May 24, 2011, 08:53
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I will do later, cant acces my server atm.

EDIT:

There we go. Pic 1 overview, Pic 2 prism front view, Pic 3 splitted view. Problem: The thinner Prism are at the Flow side, but they should be at wall side...
Hope this helps







regards
Max

Last edited by max3.2; May 24, 2011 at 11:31. Reason: pictures added
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Old   June 14, 2011, 00:45
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Hey max, if i understood your problem properly, it is just that the gap between the initial height and the final specified prism height is not sufficient enough for the number of layers you want to grow. Try computing the Height ratio, it should be less than 1. So simply reduce the number of layers to get that ratio upto 1, and then later split the prisms to get your requisite layers.
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Old   June 19, 2011, 16:04
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Hmm thanks but i think i meant something else. As you can see, the growth ratio and initial height is right, if the wall (where the boundary layer is i want to resolve) would be on the right (in the picture above). but it is on the left, so theres the problem.

(I already changed to a block mesh. but still im interested in finding my mistake)

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Old   August 16, 2011, 22:34
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edit mesh ; move nodes; redistribute prism should do the trick
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Old   August 19, 2011, 05:54
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Hi,

thank you. Since i used another mesh, I evaded this problem. But i tested it and it worked!
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Old   August 20, 2011, 20:09
Default Defect... Fixed.
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Yes, sorry, we screwed it up at 13.0

When you split prism, it does it in reverse order so the fattest layer is on the inside...

We had redone the split prism (enhanced it in a bunch of ways with a whole new more flexible algorithm) and we screwed that one thing up.

The fix is to go one more step to Edit mesh => Move nodes => Redistribute Prism. That will sort you out.

This problem was corrected for 14.0, due out later this year.
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