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November 13, 2015, 16:02 |
Problem with dynamic meshing in 2D
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#1 |
Member
Bhargav Bharathan
Join Date: Jun 2015
Location: Montreal, Canada
Posts: 71
Rep Power: 10 |
Hi,
I'm trying to simulate a boger slump test using Fluent. The boger is essentially a cylinder with open ends. It is placed on the floor and filled with a paste. It is then lifted slowly and the paste settles on the floor. I'm simulating this in 2D. To explain the set up: A - air (fluid) B - paste (fluid) C - PVC boger (solid) 1. I have the pressure inlet and outlet BC as shown. 2. I wrote a UDF for C to move in -X direction and it works. 3. Transient case. 4. Gravity on in +X direction. 5. (A, B): face sizing mesh + mapped face meshing (triangular) 6. (C): face sizing mesh + mapped face meshing (quad) 7. Laminar + Multiphase VOF models I'm having troubles with the remeshing, smoothing and layering. The problems I'm facing are: 8. There is a stretching of the mesh on one side and compression on the other side. There are no new layers of mesh being generated. The mesh stretches and at a point there is divergence due to high skewness. 9. The paste B is supposed to flow out through the gap after C moves. But this isn't happening either. My one concern is when modelling and meshing (I used workbench modeller and ANSYS meshing), I created 3 different sketches, created surfaces from them. I tried by selecting A, B, C and forming 1 single part. I tried without making the single part (current case) and selecting only A and B for 1 part, but I was facing bad meshes all around. What is the best way to model this? I have attached images of my setup. 10. The layering settings is default. Any help is appreciated. Thanks, Bhargav |
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Tags |
dynamic mesh, fluent, layering, remeshing, smoothing |
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