SYMPTOM:
When perfoming a volume/density calculation using the Redlich Kwong model, a sudden density discontinuity can happen leading to a solver crashing.
PROBLEM:
The initial guess for the newton root finder is based on the ideal gas equation. The initial guess will be returned at any given temperature when the ideal gas equation of state predicts a volume less (or higher density) than that of the Redlich Kwong equation.
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WORKAROUND: No workaround is current available. FIXED IN: ANSYS CFX Release 11.0 Service Pack 1. |
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