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[DesignModeler] Problem with creating thickness

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Old   February 12, 2017, 11:04
Red face Problem with creating thickness
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ramin
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Hello experts.

I'm working on blood vessel with FSI methode. I have a stl file for artery(without

thickness) and convert it to IGS. and there is no problem in modelling it as a

fluid zone(no FSI).now for FSI methode I need to create 0.7mm thickness for wall.

for that I create a surface body in design modeller and I put 0.7mm for thickness in ansys mechanical. but when I create thickness,there is a hole or empty space in artery.
blood zone.JPG

surface body-befor thickness.JPG

After thickness.JPG



have anyone suggestion for this problem?
please help me.
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Old   February 12, 2017, 11:21
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Uwe Pilz
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If I look at this geometry there are some problematic points:
- Elements with an large aspect ratio. Should be less than 1:5 everywhere and less 1:3 in areas of interest
- Abrupt changes in element size. It is better to avoid this, at least in areas which are of special interest.

Getting a good mesh is one of the crucial point whes simulation partial differential equations. There is no shortcut.

I always used my own geometry generators for meshing, but my experiences are only 2D.

BTW: I find that problem very interesting and would like to read more form your results.
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