KNOWN ISSUE: Transient multiphase flow with initial smoothing of volume fraction (Class 3 Error)
When doing a transient multiphase simulation in which Initial Volume Fraction Smoothing is active, incorrect answers will be obtained on the first time step.
The solver evaluation of the transient terms on this first timestep is incorrect.
No workaround is currently available.
ANSYS CFX Release 14.0. A custom executable for ANSYS CFX Release 13.0 is available on request.