hi ppl,

i need to simulate incompressible flow of a cylinder using an o-grid. Scheme is SIMPLE on structured grid. since the external boundary is a full circle, i wonder how i should impose the BC.

i guess if the flow is from left to right,

fix inlet u=1,v=0 for left half of circle

outlet du/dx,dv/dy=0,p=0 for right half of circle.

is this correct?

tks in advance

Dear Joe

I thing since the boundary is far away you should have u=1 and v=0 (instead of the gradients) all over the circle. And the no slip no penetrate conditions on the body its self!

P.S. Your B.C.s are logical so i guess they'll work but I thing dirichlect are better!

I think that you may set your boundary conditions in curvelinear coordinates (ksi,eta) not in cartesian coordinates (x,y), because y're solving your equations in (ksi,eta).