problem with FSI artery mechanical result
 

Hello experts.
I'm working on FSI simulation in an bifurcating artery by coupling fluent and
transient structural. I Know here is cfx forum but maybe someone had exprience about this.
my boundry conditions are pulse velocty inlet ( depends on time and writing as a transient profile) and zero pressure in outlets.
simulation run successfully but result of mechanical is incorrect. when I see stress result at different time,the artery miss geometrical form and when I
animate stress,no change occure during the animation.
Attachment 54164

Attachment 54165

Attachment 54166

Attachment 54167

can anyone help me?
thanks for your attention.

Hello!

Did you manage to find any solution to this? I am working on a bit similar model.

Check the stress values. The previous post had stress values on the order or 0.001 MPa, which might be too low to get deformation (?). How much stress to you anticipate? Also, zero pressure BCs might not be suitable here, instead use something more physiological? Blood pressure?

Hello Lance,

Thank you for the response. I am new to 2 way FSI. I have similar artery model. Calculated stress values are low. I considered a basic sine wave for inlet velocity and zero/atm pressure at both inlet & outlet. If available, can you please share any realistic UDF for pressure conditions at both ends?

Also, is deformed the shape of artery shown in 3rd attachment of the previous post the true behavior of artery post simulation? Or is it just the scaled deformed model?

Thanks.

I am sure there are pressure values available in the literature - dont trust strangers on the internet :)
I really hope my arteries dont look like that image, it is probably just a poor representation of a scaled up deformation.