[mukut]

Dear Foamers!

Greetings. I want to simulate flow in a plain diffuser. I have modified pitzDaily tutorial for my simulation. The flow solver is simpleFOAM and turbulence model is k-spsilon. But I didn't get expected separation from simulation as it was in experiment. I assume inlet turbulence is isotropic and estimate the flactuation 5% of inlet velocity ( 4m/s). Turbulent length scale is considered as 10% of inlet height (200mm). Using these K=0.06 and epsilon is 0.1208

The velocity contour is as follows: I have used two blocks for the domain, one is in straight section just before the diffuser section and 2nd one is remaining straight section with diffuser.



But from simulation I didn't get expected separation which I have found in experiment. So, I seek suggestion from foamers regarding my simulation. Shall I use other turbulence model? If so, which one perfectly match with my purpose?