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FSI blood flow in artery

Posted Apr 23, 2014, 9:37 a.m. EDT 1 Reply

Jonathan Erbelding
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I'm trying to simulate pulsatile blood flow in an cylindrical elastic artery. I'm using a 2D axi-symmetric FSI model, and an interpolation function for the inlet profile, which looks like the CarotidArteryProfile.jpg that I've attached. I did a simulation using just the unsteady laminar module using this inlet profile, and it worked great. However, when I try the FSI module, I am getting the error shown in Error.jpg which I've also attached. The error pops up almost immediately. I also receive a warning about my mesh which can be seen in Warning.jpg. Does anyone have any suggestions? Thanks in advance.
1 Reply Last Post Nov 29, 2014, 7:49 p.m. EST
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Hello Jonathan Erbelding

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Myungwu Woo
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Posted: 10 years ago Nov 29, 2014, 7:49 p.m. EST
Hi,

I have two suggestions. The first one is to check the velocity in initial settings. It is set to 0 by default in FSI interface. Your initial value for the velocity at the inlet boundary seems around 0.075 [m/s] in CarotidArteryProfile.JPG. This discrepancy luckily works for fluid flow only but I doubt this still works for FSI. The other suggestion is to use ‘strict’ time stepping. Inside COMSOL, default time stepping is ‘free’, which is not always good for time-varying boundary conditions. Hope this helps.

Regards,
Myungwu
Hi, I have two suggestions. The first one is to check the velocity in initial settings. It is set to 0 by default in FSI interface. Your initial value for the velocity at the inlet boundary seems around 0.075 [m/s] in CarotidArteryProfile.JPG. This discrepancy luckily works for fluid flow only but I doubt this still works for FSI. The other suggestion is to use ‘strict’ time stepping. Inside COMSOL, default time stepping is ‘free’, which is not always good for time-varying boundary conditions. Hope this helps. Regards, Myungwu

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