Hello Dear, greetings. You have to specify full mass flow rate, even when you consider either quarter or half of the cylinder.

I'm not sure I understand. If the boundary is periodic, you simply copy the outflow condition on the other side of the grid and use them as inflow conditions.

Abhinav,

you have to specify the amount which corresponds with your area. So quarter symmetry  - means 1/4 of your mass flow rate, half symmetry - 1/2 of your mass flow rate. Btw if it is a simple cylinder than you better use wedge geometry or even 2D with axisymmetry.

Victor.  

 Thanks! 

@Allard : Pardon my terminology, I meant a symmetry boundary condition.

@Victor : Thanks for you reply. I used an example of cylinder to simplify the description, but the geometry is much more complicated than that. Anything less than a quarter would not to able to include all features. We tried a simple axisymmetric solution, but were not able to match the experimental results

if u want simulate flow on cylinder u can use axisymmetric B.C in 2D.

this is for geometry with mirror face and symmetrical