[snowgetu]

Dear Foamers!

I am trying to do a a backward facing step simulation according to this webpage: http://turbmodels.larc.nasa.gov/backstep_val.html
I have specified the boundary conditions to reach a reynolds number of 36000 but I never get close to the reattachment length (max. 5.5). Can anyone tell me what is wrong with my simulation? (I think the boundary layer is wrong but I'm a bit confused about the Reynolds number as well..)
I am sending my simulation files with the post.

Thank you in advance!

[alexeym]

Hi,

1. Your mesh differs from the one on NASA's site.

2. You use incompressible solver, while:

As discussed elsewhere on this site, note that all cases are compressible flow verification and validation cases. Although many are at low Mach numbers such that the flow is "essentially" incompressible, if you run with an incompressible code your results will not exactly correspond with the compressible code results given here.

(http://turbmodels.larc.nasa.gov/noteonrunning.html)

3. How did you calculate inlet value for k and epsilon?