divergence in DDPM with RSM

I am using DDPM multiphase model with RSM and the solution diverges at the beginning after 3 or 4-time steps warning that "turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 1170 cells". I have searched for problems leading to this error and I found the following and checked them but it still the problem still exist:

1. mesh quality: max non-orthogonality is 0.5 so mesh quality can not be the problem

2. discretization method. the problem exists even with low order discretization methods

3. initialization: I used both hybrid and initialize from the inlet and both have the same problem

4. boundary condition for turbulence: at the inlet, I specified turbulence boundary condition using intensity and hydraulic diameter and it seems ok

 

can this problem have other reasons?? 

 

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