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[DesignModeler] Problem with creating thickness

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Old   February 12, 2017, 10:04
Red face Problem with creating thickness
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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, 10:21
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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.
Uwe Pilz
Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)
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