Learning Forum

[Jose Matias Arbelo Romero]

I believe ANSYS Fluent has vortex method and/or harmonic method to model fluctuating velocity at velocity inlet boundaries. I have been studying the user manual for CFX version 2023 R1m but unfortunately I have not found any reference to a similar method being implemented into CFX. 

Would somebody please assist in confirming or deny whether this is true?

Best regards

[Saurabh R Patil]

Hi,

 For the velocity inlet, the fluctuations are added on the mean specified velocity.

You can check fluent theory guide for more details: 4.15.3. Inlet Boundary Conditions for Scale Resolving Simulations (ansys.com)

Hope this helps you.

Thank you.

[Jose Matias Arbelo Romero]

Hi, thank you very much for your response. How about in CFX, instead of Fluent? There is no mention in the CFX theory guide to an equivalent method.

Best regards

[Saurabh R Patil]

Hi,

You can try specifying turbulent intensity at the inlet.

[Jose Matias Arbelo Romero]

Hi,

I have already specified a turbulent intensity at the inlet. This is not what I am looking for though. For unsteady simulations, I believe a turbulent flow inlet is desireable. Ie: one in which a time-varying flowfield is specified for the resolved length scales. The inflow fluctuations are used to emulate the turbulent content of the real problem being studied.

I know Fluent incorporates the possibility of using the "Vortex method", a synthetic turbulence generator. I believe it also has the option of using "spectral synthesizer". 

What I would like to know, if possible please, is whether CFX incorporates a synthetic turbulence generator option. And if so, would you kindly suggest how to access this utility?

 

Best regards