[b91]

what are the best 2D complex geometries to validates codes of turbulent flows.
Does anyone knows links to some journal/paper/thesis.

thanks in advance

[agd]

Well, the obvious answer is that since turbulence is fundamentally 3D, no 2D geometries are good. Having said that, the second-most obvious answer is a flat plate. Have you validated your code against a simple flat plate? With an adverse pressure gradient? Have you compared to the accepted theoretical and empirical results for that simple geometry? If you have done that, then move on to other basic cases - can you get a good separation point for flow over a cylinder? What does your boundary layer look like? Once you've satisfied those basic requirements (which are not trivial even though the geometry may seem like it) try some of the airfoils - a NACA 0012 at a Re = 9E6 and 2.26 degrees angle of attack is a good starting point. The location of the shock on the upper surface is quite sensitive to the turbulence model. Such a case should be out in the open literature.

After you have exhausted those (and other) cases, then move on to additional geometric complexity. Of course, if you have done all this work already, then feel free to ignore this post.

[b91]

Hey;

thanks for your reply. But I have already validated my code against a simple flat plate with an adverse pressure gradient and also comparison to the accepted theoretical and empirical results for that simple geometry has been done. But I still have not verified the case of NACA 0012 aerofoil. Can you post any link to the papers related to NACA aerofoil so that I can validate against them ? I have find any good resource in net.

I am currently working using K-omega model.

Thanking you in advance again

[FMDenaro]

Originally Posted by b91

Hey;

thanks for your reply. But I have already validated my code against a simple flat plate with an adverse pressure gradient and also comparison to the accepted theoretical and empirical results for that simple geometry has been done. But I still have not verified the case of NACA 0012 aerofoil. Can you post any link to the papers related to NACA aerofoil so that I can validate against them ? I have find any good resource in net.

I am currently working using K-omega model.

Thanking you in advance again

I think that the geometry-induced separation like the bacward facing step flow would be much more challenging than the 0012 airfoil

[agd]

I don't know if this link will survive the posting or not, but here is one paper for the NACA 0012. As FMDenaro has pointed out, there are other cases that can also be considered.

www.dtic.mil/dtic/tr/fulltext/u2/p013696.pdf

[LuckyTran]

I think Flat Plate, NACA air foils, flow through parallel plates are good start. There is always the flow over the backward facing step. Sorry I don't have any references off the top of my head but there are annual meetings at AIAA fluid dynamics conference that do regular benchmarking.

[FMDenaro]

the Agard can be a further source of test problems...

[akOOma]

Take a look at that: http://turbmodels.larc.nasa.gov/