[ZQWY]

Hello,
I want to use eulerian two-phase model to simulate a airlift membrane bioreactor, the viscous model is standard k-epsilon. The boundary conditions at the gas inlet are set by prescribing a fixed inlet velocity of 0.02m/s and a given gas fraction 1. the boundary conditions at the pressure outlet are set by gas backflow volume fraction is zero. I don't know why in the computation it always remind me that turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 511831 cells.
some one say there is something wrong with mesh ,but when I only model water phase use laminar model ,it runs correct and the results are resonnable.
There is another question that sometimes I use the dispersed standard k-epsilon model, after setting the water phase' turbulence specification ,when I check the case, there is a recommendation "review the turbulence specification at boundary conditions. Default values be detected." I don't know what to do.
Can someone help me,thank you !