benchmark case for validation of turbulent model
 

Dear sir:
I want to find several 3D benchmark case, especially straight pipe flow, curved pipe flow and backward step flow , could you please give me some infors about the benchmard data base.
regards

Two very well known sources are:

http://cfd.mace.manchester.ac.uk/ercoftac/index.html

https://turbmodels.larc.nasa.gov/

There are certainly others, but these are a typical first step if you are searching for something.