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Old   November 7, 2008, 04:09
Default convective boundary conditon
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student
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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

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Old   November 7, 2008, 12:18
Default Re: convective boundary conditon
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kondan
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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.
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Old   November 10, 2008, 00:22
Default Re: convective boundary conditon
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student
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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.
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Old   November 10, 2008, 13:46
Default Re: convective boundary conditon
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kondan
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I assume it has to deal with periodic boundary conditions.
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