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Meshing a bent coronary (like pipe) with stenosis (narrowing)

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Old   May 10, 2011, 07:09
Default Meshing a bent coronary (like pipe) with stenosis (narrowing)
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Martin
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Hi there

i am trying to simulate the flow in a coronary with narrowing (75% area stenosis)...

Therefor i would like to create a mesh with blockMesh. I already have some results, but they are not satisfying
The problem is, to get the curved and narrowed part generated without any inconstancies.
I defined the points, for the middle of the bent part (45 degrees) and created arc - edges from the ending of the unbent cylinders to the middle plane, with calculated points for the arcs. The arc - points are points of a circle, lying in an angle of 22.5 degrees to the ending cylinder and the middle circle. As you could see on the pictures, one will get inconstancies with this method
I hope this was not to complicating - maybe the pictures will show what i mean!!!

Now the most important question: does anyone have an idea, how to solve this problem?

Regards,

Martin
Attached Images
File Type: jpg coronary.jpg (10.9 KB, 30 views)
File Type: jpg bent - problem.jpg (12.3 KB, 32 views)
File Type: jpg bent2 - problem.jpg (37.9 KB, 42 views)
Attached Files
File Type: txt blockMeshDict.txt (6.4 KB, 15 views)
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Old   May 10, 2011, 07:23
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Martin
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Hi Martin,

you can try to use splines instead of arcs. The bend will be modeled with 5 hex blocks instead of 10.
Or have a try with discretizer...

Martin
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Old   May 10, 2011, 07:33
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dear Martin (nice Name

if i already tried to mesh it with only 5 blocks - the result is to be seen below...

I think i will need the middle circle, for getting the guaranty, that it is a circle cross section at each point of the line...
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File Type: jpg only5Blocks.jpg (26.6 KB, 36 views)
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Old   May 10, 2011, 11:21
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Martin
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I adapted the arc - interpolation coordinates a little bit - below you will see the result!!!

One problem is left: the inconstancies at the end of the curved part...

Does anyone have an idea how to solve this?

I will try a little bit with splineLines as edges - maybe results will get better..!?
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File Type: jpg adaptedGeometry.jpg (13.3 KB, 27 views)
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