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September 9, 2015, 00:01 |
Negative volume problems with mesh
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#1 |
New Member
Ahmed Jalal
Join Date: Mar 2015
Posts: 22
Rep Power: 11 |
All,
I am simulating a 2D model of a check/relief valve where the ball in the valve is oscillating in the Y-direction (up and down) due to the inlet velocity. Eventually I want to simulate valve chattering. The problem I am encountering is when the ball touches he walls or get really close, I get a "negative volume" error. Mesh: Min Ortho quality is approximately 0.6 Max Ortho Skew is approximately 0.3 Max aspect ratio is approximately 3.8 Dynamic Mesh options: Remeshing (I used diffusion with diffusion factor at 0) Smoothing 6DOF Implicit I used a UDF to determine the rigid ball motion, which is only translation in the y-axis. When I initialize the problem and inspect the motion of the ball it moves well, however, when it reaches the boundaries, I get the error. Also, it does not stop at the boundaries and continue moving which is telling me there is something with the boundary conditions of the contact. I believe since the ball ouches the wall, the topology is separated??? What do I need to consider for the negative volume I am getting? Any help would be appreciated. Thanks |
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