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-   -   Bad Cd results applying k-ε models to hydrofoil (http://www.cfd-online.com/Forums/fluent/95208-bad-cd-results-applying-k-models-hydrofoil.html)

spk December 9, 2011 06:17

Bad Cd results applying k-ε models to hydrofoil
 
Hi guys,

I simulated a 2D hydrofoil geometry in non-cavitating conditions.
The tested angles are from 0 to 10 degrees and the velocity is constant.
I simulated this hydrofoil using Spalart-Allmaras, k-ε models and k-ω models. Using S-A and k-ω models i have good results for Cl and Cd comparing with experimental results.
But using the k-ε models (standard,rng,realizable) i have good results for Cl but bad results for Cd (as the angle attack increases Cd decreases!)
Also i used enhanced wall treatment (y+=1).

k-ε models cant solve correctly the drag coefficient in hydrofoils?
Please could you help me?

spk

spk December 10, 2011 09:27

The problem is solved!


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