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Solver: stationary vs. stationary segregated

Posted Jun 8, 2010, 4:22 a.m. EDT Fluid & Heat, Studies & Solvers 2 Replies

Alois Pfenniger
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Hi,

I am simulating the deformation of an artery with FSI in Comsol. I have set initial stress conditions in the arterial wall, such that when a pressure of 80 mmHg is applied inside the artery, the wall should not deform.

I solved the model both with stationary and stationary segregated solvers. With stationary sovler, I get a maximal deformation of 9.852e-6 m. With stationary segregated, I get a maximal deformation of 5.289e-6 m.

Which solver can I trust more? The initial stress conditions where estimated, so that I cannot guarantee that they actually ensure no deformation at all. I can therefore not say that the sovler which outputs the smallest deformation is the better one. Is there a theoretical answer to which solver is best to solve this kind of problem?

Thanks for any help. Regards,

Alois Pfenniger
2 Replies Last Post Jun 8, 2010, 6:08 p.m. EDT
Danial Tz
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Posted: 1 decade ago Jun 8, 2010, 5:15 a.m. EDT
For FSI I would go with stationary solver, as it solves it monolithically. The field of partitioned solver for FSI is a bit tricky and depends highly on your problem, i.e. if densities are close to each other or not. Nevertheless, it is not only the solver type which matters, but the tolerances, iteration numbers, ...
For FSI I would go with stationary solver, as it solves it monolithically. The field of partitioned solver for FSI is a bit tricky and depends highly on your problem, i.e. if densities are close to each other or not. Nevertheless, it is not only the solver type which matters, but the tolerances, iteration numbers, ...
Alois Pfenniger
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Posted: 1 decade ago Jun 8, 2010, 6:08 p.m. EDT
Hi,

Thanks for your help which is much appreciated!

Regards, Alois Pfenniger
Hi, Thanks for your help which is much appreciated! Regards, Alois Pfenniger

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