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[ANSYS Meshing] Fluent crashing with dynamic mesh

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Old   September 15, 2018, 23:46
Default Fluent crashing with dynamic mesh
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Hello all,

I'm trying to simulate a tilted metal plate being dropped into a tank of water. The solution method is realizable k-epsilon with scalable wall function. I am using a dynamic mesh and the 6DOF module. The version of ANSYS I'm running is v17.0 and so I have to utilize a compiled UDF to specify the 6DOF inertial properties.

The solver seems to run fine until the mesh becomes stretched. The residuals suddenly diverge very, very rapidly. In fact, it's in the matter of a single timestep (of dt = 0.0001 sec).

My mesh is uniformly "fine" with an inflation later of 3 around the plate. This is the initial mesh (with VOF isosurface):



And this is the last mesh before the solver fails:



To me, this does not look like I've done a good job setting up the remeshing. Properties of my dynamic mesh:




At this point, when I try to run the solver/hit "calculate", Fluent simply crashes on me. Could it be that my cell skewness is dangerously close to 1.0? If so, how do I go about fixing that? If not, what might it be?

Thanks!

G
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