Specifying an inlet boundary k-omega profile in CFX

turbomax · August 31, 2015, 13:18

Hello,

In the k-omega turbulence model I am familiar with, omega is the specific dissipation rate of turbulent kinetic energy. However, in CFX when I want to specify an inlet boundary profile for k and omega, my only options are to enter "Turb. Kinetic Energy" and "Turb. Eddy Frequency." Is the specific turbulent KE dissipation rate the same as CFX's "Turb. Eddy Frequency?" Can anyone explain this discrepancy between CFX's definition and the usual definition of k-omega?

Thanks very much for any help.

Max

Opaque · August 31, 2015, 13:55

ANSYS CFX's Turbulence Eddy Frequency is what others call Specific Dissipation Rate of ...

-Maxim- · September 1, 2015, 04:02

in the ansys help, omega etc is defined (chapter 3.2.12.) and you can compare that to your definitions...

August 31, 2015, 13:18	Specifying an inlet boundary k-omega profile in CFX	#1
turbomax New Member Join Date: Jul 2015 Posts: 13 Rep Power: 11	Hello, In the k-omega turbulence model I am familiar with, omega is the specific dissipation rate of turbulent kinetic energy. However, in CFX when I want to specify an inlet boundary profile for k and omega, my only options are to enter "Turb. Kinetic Energy" and "Turb. Eddy Frequency." Is the specific turbulent KE dissipation rate the same as CFX's "Turb. Eddy Frequency?" Can anyone explain this discrepancy between CFX's definition and the usual definition of k-omega? Thanks very much for any help. Max

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August 31, 2015, 13:55		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,869 Rep Power: 33	ANSYS CFX's Turbulence Eddy Frequency is what others call Specific Dissipation Rate of ...

September 1, 2015, 04:02		#3
-Maxim- Senior Member Maxim Join Date: Aug 2015 Location: Germany Posts: 413 Rep Power: 13	in the ansys help, omega etc is defined (chapter 3.2.12.) and you can compare that to your definitions...