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Rotating Heat Pipe Help

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Old   July 4, 2021, 04:26
Default Rotating Heat Pipe Help
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Hi. I am simulating a rotating heat pipe with phase change. It is divided into three sections, evaporator, adiabatic part and condenser. I have an initial fill ratio of 8% liquid. I have big problems for phase change. Using Lee's model either via UDF or as a standard fluent model I cannot observe the phase change. I also have problems with turbulent viscosity instability which leads me after a short while to Courant Number over 250 and diverging solution. Do you have any suggestions? My idea is to implement a new multiphase model, Sun's model via UDF, as mentioned in the paper I am referring to. Big problem is the inability to write the udf of this model, do you have any suggestion or help to give me please? I will leave the model below.
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condensation model, evaporation condensation, heatpipe, multiphase, udf

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