# convective boundary conditon

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 November 7, 2008, 04:09 convective boundary conditon #1 student Guest   Posts: n/a Sir, I am solving channel flow problem, At the exit I used fully developed boundary condtion du/dx=0. I have seen one paper mentioned at the exit convective boundary condtion i.e du/dt+u(avg)*du/dx=0 please help me how to use this as boundary condtion. Thank you

 November 7, 2008, 12:18 Re: convective boundary conditon #2 kondan Guest   Posts: n/a The second equation also implies the fully developed conditions at the exit (du/dt = 0 for steady flow, and second term du/dx = 0 as you have specified). So you are all set. No problem there.

 November 10, 2008, 00:22 Re: convective boundary conditon #3 student Guest   Posts: n/a Thanks. Actually I am solving time dependent problem I understood. One more doubt in vortex shedding problem at the top wall u[i][j]=-u[i][j-1] and at the bottom wall u[i][j]=-u[i][j+1]. Could you please tell me how do we name this type of boundary conditions.

 November 10, 2008, 13:46 Re: convective boundary conditon #4 kondan Guest   Posts: n/a I assume it has to deal with periodic boundary conditions.

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