KNOWN ISSUE: Boiling calculations with an energy model for the vapour (Class 3 Error)


SYMPTOM:
If either the Thermal Energy model or the Total Energy model is used for the vapour in a calculation using the RPI boiling model, then temperatures of the vapour phase are incorrect, being potentially either unphysically low or occasionally unphysically high.

PROBLEM:
This is due to an energy source term being included twice.

WORKAROUND:
The problem can be ameliorated by setting the Nusselt number on the zero resistance side to a high value. It is however better to set the vapour to be isothermal.

FIXED IN:
ANSYS CFX Release 14.0. A custom executable for ANSYS CFX Release 13.0 SP2 is available on request.





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