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Fluent Boundary Conditions Lifting object out of water

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Old   March 25, 2017, 22:45
Default Fluent Boundary Conditions Lifting object out of water
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Daniel Rogers
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Dear everyone,


I have a question regarding ANSYS fluent.
My geometry is attached in a photo.
A cylinder is lifted out of water, I use two way symmetry to simplify the problem.
Afterwards I create the water based on the CAD model. There is a tiny gap between the cylinder and the vat. This why I get a little area in the corner.
I have tried two different meshes attached with photos.
I hope this setup is fine. Please correct me if I am wrong.

Next I set up the calculation. I have chosen the free surface (top of the water) not covered by the cylinder as a pressure inlet. Is that correct? I get a lot of reverse flow.
Then the calculation is a transient calculation as I lift the cylinder out of the water. I used remeshing by layering. This gives me about 15 calculation steps until my solution diverges. Can anyone comment on that?

My question: Can someone give advice on boundary conditions?
Does anyone have experience with remeshing?

I am thankful for any help you can give

Kind regards
Daniel
Attached Images
File Type: jpg vat (2way symmetry).JPG (35.2 KB, 1 views)
File Type: jpg close up2.JPG (149.1 KB, 2 views)
File Type: jpg close up1.JPG (152.2 KB, 1 views)
File Type: jpg mesh.JPG (121.7 KB, 1 views)
File Type: jpg water.JPG (33.2 KB, 1 views)
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