hi i am trying to bench mark flow over spher problem with experimental results. The drag coefficent what i am getting with cfd is not matching with experimental. Any boby can guess. the flow field is steady, 3d, Laminar and Reynold no is 100. Thanks in advance.

[kr63]

Hi
you should check where the transition and separation is taking place in both casses.

[DoHander]

On the same mesh do a turbulent simulation and check your y+ if this is larger then 1, the n you are not properly solve the boundary layer region.

You can create your mesh in order to have a y+<1 and then do again the laminar calculation - also try steady vs. unsteady. You can find here on cfd-online a good y+ estimator.

Do