Discussion Forum

Hello,

I'm going to model a simple artery , here is the model definition:
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Model data
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A cylindrical artery with 10mm radius, 1mm thickness and 80mm length is considered with E=10MPa,v=0.3,density=1050.
Blood flows through the artery, density=1050 and viscosity=0.022 Pa.s ,
Blood inlet pressure form : 100+100*sin(3.14*t) [Pa]
Blood outlet pressure : 0 [Pa]
The inlet and outlet of the artery is fixed.
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I want to build the animation of blood pressure, velocity, artery deformation in first 20 seconds of simulation ...
I've done all of the above and I'm almost sure it's correct, but my model doesn't converge.
Please help me by answering the following questions :
1- As this is a pulsatile flow, the artery expands and constricts periodically, can I consider the structure as quasi static? or all of the model should be solved as time dependent??

2- there're some sections in my FSI module called 'Free Deformation 1','Wall 1', 'Prescribed Mesh Displacement 1' with three checked 'Prescribed x,y,z displacement = 0', 'Free 2'. I don't know what are these and how I should treat them...

3- for the fixed artery in inlet and outlet, I've defined a fixed constraints BC and selected the boundaries at inlet, outlet artery wall. Is this correct?

4- Should I define a 'Prescribed mesh velocity' at interior FSI walls with Vx=0 too ? (as the no slip condition)

5- The outer surfaces of the wall, should I define a roller BC for them??


That's all. Please advice.