appropriate BC  top half of the pipe
Hi,
Im simulating a pipe with a ke model, considering the top half of the pipe. My problem is with the boundary conditions. I set “velocityinlet” and “pressureoutlet” for the inlet and outlet faces. What is the more appropriate BC for the symmetry plane? “symmetry” or “axis”? What is the difference? 
*symmetry means symmetric with respect of a plane
*axis means revolutionaxisymmetric with respect of an axis (solution thetaindependant with theta: rotationangle around your axis) When you are using axis, you must work with 2d solver. 
thank you very much!

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