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How do you choose your turbulence model? What challenges do you face?

How do you choose your turbulence model? What challenges do you face?

(OP)
Hi Eng-Tips,

I'm writing an overview article on www.ENGINEERING.com about how to choose a CFD Turbulence model.

I was wondering if Eng-Tips users have any input they would like to add about their personal experiences? I will keep things generic in the article so people can have anonymity. This can really help the CFD community with this challenge.

-How do you choose your turbulence models?
-What challenges do you face modeling turbulence?
-What CFD software do you use? Did your organization choose it for it's library or Turbulence models or a specific one?

Thanks for your help,

Take care,

Shawn Wasserman
Editor at www.ENGINEERING.com
@ShawnWasserman

RE: How do you choose your turbulence model? What challenges do you face?

Hi Shawn,

if I am in the situation where I have to chose a turbulence model, I am looking at the computational costs as well as the application.

For instance if I have the k-epsilon model, I won't use that in flows with strong seperations, large streamline curvatures and large press. gradients.

K-omega is accurate enough for boundary layer flows with press. gradient and so on.

So I look what methods have been used for a particular application that have proved to be successful.

This approach also carries a risk since you cannot apply the same turbulence models just because "it is the same" simulation. You have to look at the boundary conditions and have a good understanding of the mathematical models behind the turbulence models which is crucial!

I personally do not use a software but a cloud-based simulation platform called SimScale that covers a wide range of turbulence models in CFD and combines everything from the Pre-processing (Meshing) to the Post-Processing. I can highly recommend trying SimScale! Not only are you independent from licenses but you can simulate for free as long as you are satisfied with the number of computing hours SimScale provides you with.

Kind regards,

Jousef

Cloud-based simulation in your browser:

https://www.simscale.com/

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