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The mass nonconservation caused by the moving mesh |
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November 27, 2024, 02:24
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The mass nonconservation caused by the moving mesh
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WEBEER
Join Date: Jan 2024
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Dear teachers, I am conducting a simulation of compressing ideal gases using an internal combustion engine grid. My 3D compression chamber model has no inlets or outlets, only walls. When the time step is 10e-05, the average air mass in the compression chamber is nearly constant, but the calculation is too large. When the time step is adjusted to 10e-04, the average air mass in the compression chamber will drop significantly, resulting in a large error in the calculation results. What's going on? Here are my model diagram, residual diagram, and mass change diagram.
  https://picture.gptkong.com/20241127...cc891b5f29.jpg |
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| compress air, dynamic mesh, mass defect |
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