Hello, everyone. Now I am trying to model two-phase flow using Eulerian multiphase model with dispersed k-e model. However, I have a convergent problem. When I tried to ingore the turbulence equation in the solution panel, I found it converges well. Does anyone know that whether my solution is reasonable without the turbulence equation? Or is it possible that I will get some reasonable solution when I add this turbulence equation later? Thank you very much.

You need to give much more explicit on what you are modelling for anyone to be able to answer your question.

O.K. I am sorry that I stated my problem simply. Actually, I am trying to model air(gas)-water(liquid) two-phase flow problem using Eulerian multiphase model. It is unsteady solver with standard k-e turbulence model. I use vel-in for both phases and pressure-out boundary condiition. After the simulation runs, I noticed that the residual of the continuity is quite big (~ 0.1) and it stays flat. I tried to reduce the under-relaxation factor of momentum. The residual went down to ~ 0.001 but also stayed flat (did not converges!) Finally, I noticed that if I did not select the equations of turbulence under the panel of "solve->controls->solution", the residuals go down perfectly. I want to know the effect of the turbulence in the solving processing. Is it possible to get the reasonable solution in this way? BTW, I also tried to refine my mesh or reduce the time step during the calculation but the residuals did not go down. Thank you very much.

Turbulence is multiphase flow is a thorny issue ... Reynolds number dependancy etc.

I use air-water two-phase flow. Since the superfacial velocity for air is about 0.23 m/s and for liquid is 2 m/s and the void fraction is 10%. The Reynolds number for gas is only 736 but for liquid is 1e5, which is quite large.