[sgaggar]

Hello everyone!

I am a relative novice in turbulence modelling. I have made and simulated the flow of air in a pipe with a 90-degree bend using a k-omega SST model on ANSYS Fluent Academic. Through this, it is easy to visualize the formation of Dean's flows at the outlet of the pipe section.

Now, I want to divide the total pressure drop and total friction losses into its components coming from the primary and secondary flow. I looked at the literature but until now, I have been unable to find some CFD analyses or even some theoretical models that might allow me to do this. So I needed your expert guidance on the topic. Specifically, I would like to ask the following:

1. Is there a way to segregate the losses into its components directly or by running a user-defined script in any commercial code (I am working right now in ANSYS Fluent Academic but I would be switching to Star-CCM+ soon)?
2. If not, is there a way to calculate just the pressure drop of the primary flow? I was considering somehow evaluating the Darcy Weisbach equation along the length of the pipe to find the effect due to the primary flow, and then subtracting this from the total pressure loss across the pipe to find the effect of the secondary flow. Is this approach possible (and correct)? Would I be missing something if I took this route? Are there any other possibilities?

I would greatly appreciate if you could help me with the same and please do let me know if I was not clear enough or can provide some additional information.

Thank you for your time!

Kind Regards!