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Rotating Mesh - Mesh Overlap/Discontinuity At Boundary Interface

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Old   June 10, 2020, 12:17
Default Rotating Mesh - Mesh Overlap/Discontinuity At Boundary Interface
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Hello,

I am trying to model a 3D scenario in which a cube is placed within a channel and is experiencing a crossflow while the cube is rotating. I am rotating the cube by encapsulating it within a rotating cylinder region and using a rotating mesh. I am attaching a visual of the model at a certain point in time of the simulation. On the macro level, I am not detecting any issues with the results but when I zoom in close to the boundary between the rotating ellipsoid domain and the surrounding stationary flow field domain (picture attached), there seem to be discontinuities (mesh gaps and overlapping points) as the mesh moves. This may be skewing the results locally and I am not sure how that is affecting the results on a macro-scale. I have also attached a zoomed in view of the boundary so you can understand what I mean by the "gaps".

Ideally, I would like to have some sort of dynamic mesh refinement at this interface that would adjust the flow field mesh to fill in those voids. Is the best way to go about this to use 'Dynamic Meshing'? There are many methods so I am not sure what would be best for this situation. I am not sure if the mesh elements are being distorted, but rather they are not adjusting to fill the voids. The best thing I have had some success with is increasing the mesh density at this interface so that the element size is very small and therefore as the rotating domain slides at the interface, the gaps are small.

If you all have any suggestions for how to improve the model and avoid this issue, that would be great. I am relatively new to ANSYS Fluent, and I am stuck at this point.
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File Type: png overall view.PNG (62.5 KB, 6 views)
File Type: png zoomed view.PNG (20.5 KB, 2 views)
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Old   June 15, 2020, 08:58
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The mesh appears to be very coarse. Refine it.
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