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-   -   about valve closing problem during ANSYS FSI simulation (http://www.cfd-online.com/Forums/cfx/77461-about-valve-closing-problem-during-ansys-fsi-simulation.html)

ivy June 23, 2010 12:03

about valve closing problem during ANSYS FSI simulation
 
Dear all,

I am a new user of ANSYS CFX. What I am now trying to do is to simulate the aortic valve open/close process by ANSYS FSI. My problem is, when the valve approaches to close, the simulation can not continue as the fluid domain is going to be divided into two parts. Does anybody have similar problem? Or have you ever seen any tutorial material relevant to this problem? Any suggestion from you would be greatly appreciated! I would be very grateful if you can share your experience! Thanks!

ghorrocks June 23, 2010 18:40

The motion you are modelling is very complex and I doubt using a moving mesh approach is practical. I encourage you to look at the immersed solid approach instead. Not sure if this approach will work either but definitely check it out.

ivy June 24, 2010 09:39

Hi Glenn, Thanks for your kind reply. I will try as you suggested. Thanks again!:)

Quote:

Originally Posted by ghorrocks (Post 264266)
The motion you are modelling is very complex and I doubt using a moving mesh approach is practical. I encourage you to look at the immersed solid approach instead. Not sure if this approach will work either but definitely check it out.


kimiaghalam June 8, 2011 17:53

kind of a same problem
 
Hi ivy,

I am trying to model the opening and closing behaviour of the aortic heart valve using ANSYS CFX as well. My problem is that I always have smome skewed mesh elements in my model which stops the run when I'm using mesh motion. I have also tried immeresed solid but then I keep running out of solver memory. How did you manage to run the mesh motion ?

Best Regards
Morteza

ghorrocks June 8, 2011 21:01

When the motion is as large as I imagine an aortic valve would be then mesh motion will need some help to avoid folding the mesh. You will have to put in some remeshign steps to keep the mesh quality acceptable. Talk to CFX support about some examples of automatic remeshing.

This would be tricky to do with immersed solids as the approach has restrictions such as the immersed solid cannot contact a wall.


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