Class 3 Error
SYMPTOM:
The interphase mass transfer rate is inconsistent in how it is applied to the continuity equation compared to the energy equation and the mass imbalance when using the default segregated volume fraction solution method. The mass transfer rate is bounded in the continuity equation but not elsewhere. This can give errors in a converged solution, which may be noticeable in the imbalances.
PROBLEM:
This is due to the area density not going to zero as the volume fraction goes to zero or one, i.e. away from
WORKAROUND: One workaround is to use the coupled volume fraction solution method. An alternative workaround is to use the expert parameter setting 'interface delta option = 2', which uses an alternative area density correlation which is bounded. FIXED IN: ANSYS CFX Release 12.0. 

