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-   -   Problems with circular shapes in FSI simulations (http://www.cfd-online.com/Forums/ansys-meshing/68321-problems-circular-shapes-fsi-simulations.html)

kezman September 15, 2009 09:35

Problems with circular shapes in FSI simulations
 
Hello,

I am working on a impact model of the human head. Skull, Cerebrospinal fluid (CSF) and the human brain.
First I made a very simple model without the brain. Just a simple square filled with the CSF. There is a force applied (starts at 3e-5 seconds ends at 9e-5 seconds ) at the front of the square which represents the impact.
BUT when I model the brain in this square (see it as a circle in a square, around the square is the CSF) the simulation stops always at the timestep when the force will come up.

I tried all different kind of meshes and it didn't help. Maybe the problem is the density of the brain and the fluid, because they are almost simular??

end time = 3e-3
time step = 3e-5

Hope someone can help me.

Kezman

PSYMN September 16, 2009 11:24

Meshing oppinion...
 
I am no expert in your application, but this doesn't sound like a meshing issue to me (or you wouldn't get to the first time step)...

Ask this question on the solver setup boards, but you will probably need to provide more info about which solver you are using, as well as your bocos, etc.

It may be that you don't have constraints setup correctly.


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