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Old   October 29, 2013, 14:45
Default tet growing rate
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Francisco
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Hi everybody,

I'm working in a 3d conformal tet-mesh and I'd like to know how to control the rate at which tetraedrals are growing in size away from a size determined zone.

Is there a parameter for that?

I remember it was pretty easy to set this gorwing rate in the ansys meshing tool.

Thanks a lot!
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Old   October 29, 2013, 18:11
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You can work with a density region to determine a local max size in aspecific regioin. Density Box has the option "ratio" which sets the grow rate of elements away from the density region. A value near one gives you a very smooth transition. The option "width" sets the number layers that grow with the determined ratio away from the density box. For very different element sizes you might also put a density region in a density region to achieve a better transition. Works both for octree and delaunay.
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Old   October 30, 2013, 08:11
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Okay, I'll give it a try. This density region has to be a volume enclosed by surfaces? Thanks Kad!
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Old   October 30, 2013, 09:36
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I don't think it has to be a volume enclosed by surfaces. Just set it up anywhere you want. I recently used density region with a fixed grow ration near 1 and a width of 15 or 20 myself. Pics are attached.

Remember that octree uses element sizes as a power of two of the smallest mesh size, so your requirements probably won't be met. If you have octree volume you should better replace it with delaunay.
Attached Images
File Type: jpg density1.jpg (13.8 KB, 12 views)
File Type: jpg density2.jpg (55.6 KB, 11 views)
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