[Rajaero]

Hello Guys,
I am working on transient multi-phase simulation of Oil inject twin screw compressor (rotors clearance 0.036 mm) by Twin-mesh and CFX. I am getting "overflow" error at 35th and 40th time step.

The following possible changes already made to solve "overflow" error:
1. Tried with k epsilon and SST turbulence model.
2. Different mesh size (max element size 1 mm and 0.8 mm and 2 mm)
3. Different inlet and outlet condition (pressure inlet and mass flow inlet, opening and static pressure outlet)
4. Homogeneous and in-homogeneous with and without free surface model and interface transfer
5. Coupled and segregated multi-phase coupling method
6. Tried with different relaxation parameter and memory allocation factor (expert parameter)
7. run in first order and high resolution
8. Tried with small time step

Note:
I tried all the above changes but still,
I got over flow exactly at 35th time step with first order (advection, transient, turbulence) scheme.
I got overflow exactly at 40th time step with high resolution (advection and turbulence) scheme and second order (transient) scheme.

please someone help me with this "overflow" problem. I truly appreciated your help in advance. I have attached a image of overflow error for your reference.

Thanks...