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

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May 10, 2011, 07:09
Meshing a bent coronary (like pipe) with stenosis (narrowing)
#1
Member

Martin
Join Date: Aug 2010
Location: Germany
Posts: 55
Rep Power: 9
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
 coronary.jpg (10.9 KB, 39 views) bent - problem.jpg (12.3 KB, 40 views) bent2 - problem.jpg (37.9 KB, 53 views)
Attached Files
 blockMeshDict.txt (6.4 KB, 19 views)

 May 10, 2011, 07:23 #2 Senior Member   Martin Join Date: Oct 2009 Location: Aachen, Germany Posts: 253 Rep Power: 14 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

May 10, 2011, 07:33
#3
Member

Martin
Join Date: Aug 2010
Location: Germany
Posts: 55
Rep Power: 9
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...
Attached Images
 only5Blocks.jpg (26.6 KB, 44 views)

May 10, 2011, 11:21
#4
Member

Martin
Join Date: Aug 2010
Location: Germany
Posts: 55
Rep Power: 9
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..!?
Attached Images