# Slip boundary condition

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 October 2, 2012, 08:29 Slip boundary condition #1 Member   mahzad_kh Join Date: Jun 2010 Posts: 38 Rep Power: 9 Sponsored Links Hi every body I'm solving inviscid flow over Naca0012 airfoil using a control volume based finite element method! I'm using slip boundary condition at wall. I've used two method for applying wall boundary condition: 1) at wall the mass fluxes are zero so the continuity equation doesn't change! for x and y momentum equations the pressure fluxes for the wall are added to the equations. For x-mom equation integral(p.ds_x) is added and for y-mom equation integral(p.ds_y) is added. 2) at the wall I have transfered the x and y mom equations to the normal and tangential directions at the wall, It means that I've replaced the x-mom with this equation: (alfa is the local angle of the surface) in tangential direction: Mom_x.sin(alfa)-Mom_y.cos(alfa)=0 and I've replaced the y-mom with this equation: in normal direction: u.cos(alfa)+v.sin(alfa)=0 but unfortunately in both cases my code didn't converge!I have solved the code for viscous flows and it works. I think, maybe there is something wrong with wall boundary condition. Does anybody have any idea about that? Is there something wrong with my boundary condition? Thanks in advance

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