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FSI 2D - dynamic mesh

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Old   June 6, 2018, 10:08
Default FSI 2D - dynamic mesh
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I am preparing 2D FSI analysis in ANSYS Fluent and Mechanical. For this purpose, I created extruded (sweep) mesh for the one layer.
I am using smoothing and 2.5D remeshing.

Unfortunately, I had the NCV (Negative Cell Volume) problem.
My case is some flap in the water stream.

In the below picture, I showed the cell volume contour and mesh; it shows only negative cell volumes.

Please give me some advices, what could be wrong. I tested many time step sizes, the min and max cell size in dyn mesh settings is OK.

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Old   June 6, 2018, 17:10
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It seems to me like the information about the flap deformation is not transferred from Mechanical to Fluent.
The mesh before calculation:

and after calculation, with negative cell volumes:

It's strange - I set appropriate data transfers and dynamic mesh zones.

But I'm not sure if I should search the mistake here - maybe it's only dynamic mesh issue?
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