[Mazen91]

Hi everyone,

I am trying to model an FSI simulation of a tricuspid aortic valve with a model I have designed on CATIA. Unfortunately I am getting problems defining fluid-solid interfaces in the CFX setup since the leaflets do not appear as I suppressed them in the fluid mesh. I also suppressed the fluid volume in the solid mesh. Please note the leaflets are not visible as part of the fluid volume for some reason. If you can offer any help or tips I would be very grateful. I have been really stuck on this for a few months now.

Kind regards

[urosgrivc]

Did you set (fluid solid interface) in structural?

[Mazen91]

Yes I did. I also set the clamped boundary condition at the attached edges of the leaflet. Could it be a problem that the leaflets are surface bodies (CAD model problem) or a problem with the ds.dat multisolver file coming from the structural module??

[urosgrivc]

It might be a surface problem I think, as you set fluid solid interface to a surface you can probably only click on the surface you have (both sides of the surface as it doesent have sides becouse it doesent have thicknes),
but structural needs forces which are calculated from presures and if presure on a surface is the same on both sides there is no forces as these cancel out as these are oposite to eachother,

I hope i did not complicate to much and I hope you get where Im going vith this.
I havent done FSI simulation in which solid body is a surface (only 3d fluid,solid) so I dont exactly know if this is posible, so somebody vith these kind of experience will have to help.

But i think that if you would have a 3d body valve you wouldnt have problems. i think that fluid solid interface in structural for 2d body is not well defined

Try to structuraly deform (bend) a 2d element with pressureBC in structural (is it posible?). it actualy is but the direction of deflection is (surface side dependant (but it doesent have sides) wierd) I will just stick to not well defined.