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ashtonJ November 30, 2011 19:49

Fluid Solid Interaction
Hi all

I got the following error while doing FSI simulation inside a straight tube.

A negative ELEMENT volume has been detected. This is a fatal error and execution will be terminated

Does inappropriate boundary condition result in this error? If not, what the problem is. I used a time dependent velocity distribution at inlet.

Thank you

Zigainer December 2, 2011 08:52

Negative element volume is probably a mesh problem, so first check your mesh.

omidiut December 2, 2011 12:37

When your deformation in solid domain is large, this error always be occur. One of the limitation of FSI simulation is it. you most use smaller time step.

qingyue1987 December 12, 2011 07:37

YEAH,i also encounter the same problem. I learn to use the rigid body .but if the force was applied the mesh motion will destroy the to solve the problem? are there someone know how to use the rigid body and how to write the formula or CEL for it?

omidiut December 13, 2011 04:14

rigid body solution is different from FSI you explain more?

qingyue1987 December 13, 2011 04:18

you know ,rigid body is another type of simulation of FSI,

k_k December 15, 2011 07:31

Increase the mesh stiffness near smaller elements or where you have folder mesh. Use a smaller time step.

qingyue1987 December 15, 2011 07:35

how to use ''transiant analysis''and 'steady state analysis' in FSI ?

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