Class 3 Error
When an epsilon-based Reynolds stress turbulence model is used for modelling certain flows, such as that past a blunt body, it is occasionally possible for the turbulence to disappear entirely, and for the CFX Solver to predict an unphysical laminar solution. This will often be noticeable.
This is due to the parameter ustar, in the turbulent wall function, vanishing when the turbulent kinetic energy i
No workaround is currently available.
ANSYS CFX Release 12.0. The fix is achieved by a combination of documentation and the inclusion of a new expert parameter, which modifes the turbulentb wall treatment.