[rafiktharwat]

Hello

my case is simulating Convergent-Divergent Nozzle with NPR=4.0

the simulation results of k-e STD turbulent model shows good results compared to the experimental readings.

however the problem is that i got bad results for static pressure on the inner surface of the nozzle when using K-w SST and K-e RNG models.
as shown in the attached figures.

i tried different mesh configurations , also a different Y+ values ( 0.5, 1 , 30 and 200) all have small impact on the results .
and results are almost mesh Independence.

please i need advice to achieve an acceptable results for K-w SST and k-e RNG.
i think the problem is about separation after the minimum area of the nozzle.
need advice abut Models corrections , constants corrections or mesh requirements modifications.

Thanks For your Help

Attached:

Pressure Results For Turbulent Models


Velocity Mach Number k-e STD


Velocity Mach Number k-e RNG