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Old   October 21, 2020, 04:16
Default rhoSimpleFoam Help
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Hello everyone,


I am trying to do a rather simple test case where a hot air stream in a pipe like shape is at some point mixed with a colder air stream and I want to find out the temperature at the outlet.


The Mach numbers are very small (<= 0.01), thus I probably would not need to use a compressible solver. However, I need the temperature field and I didn't find such an incompressible solver.


My problem is that the simulation does not converge. I tried a lot of relaxation factors and boundary condition combinations but nothing seems to help. I also tried to start with very low relaxation factors and increased them after about 100.000 iterations each, still no convergence.



Maybe somebody has an idea what I'm doing wrong.


You can find the case here: https://www.dropbox.com/sh/xlpwf1had...z_CzdpB6a?dl=0



Thank you


Maike
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Old   October 22, 2020, 09:04
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If anybody wondered.. I fixed the problem by simulating with turbulence (RAS - kEpsilon) and starting off with very low relaxation factors (0.01) for every variable except U (0.8).
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heat transfer, hot air, multiple inlets, rhosimplefoam, thermophysical model

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