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FSI. simple pipe case crashes

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Old   November 19, 2018, 12:59
Default FSI. simple pipe case crashes
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I've tried to simulate an FSI case - flow through an elastic pipe.
Fluent and Transient Structural were used.

I've set up both participants and joined them using a system coupling block.
Then I've defined forth and back data transfers between the components.

Unfortunately, during a simulation I've got an error, saying:
(DP 0) Element 720 located in Body "FFF\vessel" (and maybe other elements) has become highly distorted. You may select the offending object and/or geometry via RMB on this warning in the Messages window. Excessive distortion of elements is usually a symptom indicating the need for corrective action elsewhere. Try incrementing the load more slowly (increase the number of substeps or decrease the time step size). You may need to improve your mesh to obtain elements with better aspect ratios. Also consider the behavior of materials, contact pairs, and/or constraint equations. If this message appears in the first iteration of first substep, be sure to perform element shape checking. Named Selections for the offending element can be created via the Identify Element Violations property on the Solution Information Object.
I've tried to decrease the time step, but with no success. I'm wondering why so simple case crashes...

Could anyone help with this case?
Thank you in advance!

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ansys, fluent, fsi, fsi 2-way coupling, transient structural

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