Need help - Divergence in AMG solver - temperature
Hi all,,
I am doing dual stream heat transfer analysis of 3 heat exchangers which are put together under a single domain. After modelling all the three heat exchangers under a single domain ( cuboid ), I mesh it. There are many contact regions created ( nearly 300 ). After that I mesh it. And I open it in fluent. I turn on the energy equation and I gave the cell zone. In boundary condition, I gave the air in(velocity inlet) and air out(pressure outlet) for the domain. Now for coolant I'm not able t give the boundary condition since all are under interface so that mesh interface is created. If I change the interface option to mass flow inlet, the solution is diverged and following error pops out. " Divergence detected in AMG Solver - temperature" "Temperature limited to 1.000000 in 22500 cells in domain 17" "Floating point exception" An if I delete all the contact regions, then also it is not working and the same errors pops out. What should I do now ??? I have clean mesh and geometry. Help me. Thanks in advance... |
reduce the Under relaxation factor for energy near 0.2 or reduce mesh skewness
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But the thing is that I tried this method by reducing the UDF energy to 0.6 Still it showed the same error. Now my question is how to create a contact region for mesh interface ? Help me |
in mesh with the help of new contact region, we can create contact or in solver with the help of mesh interface by selecting srg and their respective trg
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If possible, send me tutorial if you have any. Thanks. |
watch this video https://www.youtube.com/watch?v=NPJImYibx48
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