[hamedc]

Hi,

What should I do to calculate the exact tke and eps at the inflow and outflow of engine?
Based on what computations (hydraulic diameter) did you enter tke and eps in your example (SAGE-pfi)?
In my case, the inlet and outlet are not open to the same conditions.
similarly, how to calculate these values for injector simulation?

Best regards,
Hamed

[tmburton]

Hamed,

Typically the turbulence intensity is specified depending on the anticipated turbulence level for your application:
-
High turbulence flow: 0.05 to 0.20
-
Medium turbulence flow: 0.01 to 0.05
-
Low turbulence flow: < 0.01

and a turbulent length scale is also selected, usually 5-10% of the hydraulic diameter. Together, the turbulence intensity and turbulent length scale set k and epsilon at the boundary. Please see the slides from the Boundaries and Boundary Conditions lecture of the CONVERGE introductory training for more details.

Best regards,

Tristan