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FSI - negative volume in very elastic walls model

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Old   November 6, 2016, 01:45
Default FSI - negative volume in very elastic walls model
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Marcin
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Hi everyone,

I'm trying to solve a model of a blood flow in very elastic walls using 2-way Fluid-Structure-Interaction and time-depentend velocity. The strains are much greater then the cell size next to the wall, so I've got a problem with dynamic mesh - negative volume. When I use a poor mesh without any inflation, I can solve several time steps without this problem, but after that number of time steps I receive a problem with convergence (continuity). Furthermore, the model with a poor mesh is very inaccurate, obviously.

I'm using a structural, hexahedral mesh. I use dynamic mesh: smoothing and layering.

Can you give me some advices, how can I solve this model with high quality mesh not receiving above problems - negative volume or convergence?

Regards,
destroy
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