Solving 2d problems by 3d solver
Can we solve 2d CFD problems by using 3d CFD codes with periodical boundary condition in third direction?

Re: Solving 2d problems by 3d solver
As my experience(use a 3d code to envaluate the lift of 2d aerofoil), I let the length of computaion domain in the third direction to be much biger than the other two directions, then I averaged the third direction. It is expensive but maybe much reliable.

Re: Solving 2d problems by 3d solver
You should use symmetry conditions (zero normal derivatives) in the third direction and not the periodic bounday conditions. The third velocity component should be set to zero (Dirichlet condition).
regards DML 
Re: Solving 2d problems by 3d solver
If there is a real 2D configuration you can solve the problem with a 3Dcode by setting symmetry boundary conditions at the surfaces in the third direction. Periodic boundary conditions are not really appropriate because this kind of BC does not imply zero mass flux over these surfaces.

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