Effective thermal conductivity in turbulent flow
I am simulating single phase incompressible turbulent flow using basic komega model in CFX 12. I want to know the effective thermal conductivity from the results at each point in fluid domain. Now
effective thermal conductivity = thermal conductivity of fluid + Cp * eddy viscosity/ turbulent Pr eddy viscosity is listed as a variable in CFX post can be accessed. Where is the value of turbulent Pr listed? If I am thinking correctly, this is an empirical constant for the komega model but I could not find its value in the documentation. Thanks for your help. Best, Chander 
It is set in the turbulence model details in CFXPre. I think by default it is 0.7 but you should check this.

Quote:
Anywhere else I could look? Also, is the way I am trying to account for turbulence in thermal conductivity ( the formula in my above post) correct? 
In CFXPre, setting the domain: Fluid Models/Turbulence/Turbulence Flux Closure for Heat transfer/Turbulent Prandtl Number. Looks like the default for komega is 0.9.

Quote:
Also, the Ansys CFX support says that turbulent prandtl number is defined as sigmaomega and is equal to 2 as given in the cfx solver theory guide under komega model. But I dont see it among the options in CFXPre. Does it mean it is hardcoded and not accesible in my version of 12.1? 
I am on V13. Also you might need an advanced turbulence model license (or a full capability solver license) to access it.

All times are GMT 4. The time now is 07:07. 