Boundary condition..
 

dear All, I am new to CFD. I am trying to write code for the solution of incomressible NS equations. I need to write boundary conditions. I have two conditions. Case 1. = No flow boundary conditions i.e., Non-slip wall BC for example water filled upto the top in a tank covered with the wall . Case2 = Water is flowing from one side to and getting out from the another side. In case 1, I can impose, u,v,w (velocities)= 0 on the walls of the control volume which constrcts the grid. What about the Case 2 ? Any kind of response would be appreiciated. Thanx.. Sas...