# convective BC for non-vertical exit

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 September 17, 2006, 08:41 convective BC for non-vertical exit #1 zonexo Guest   Posts: n/a hi, may i know what's the formula for convective BC when the exit is not vertical, like in an o-grid. when i'm using c-grid, the exit is vertical hence, du/dt+U*du/dx=0. Is it the same for o-grid as well? or should it be du/dt+U*du/dn=0.? Thank you.

 September 18, 2006, 09:59 Re: convective BC for non-vertical exit #2 Mani Guest   Posts: n/a No, if du/dt+U*du/dx=0 is your governing equation, then this equation is valid everywhere, in the interior domain as well as on all boundaries, regardless of their shape. The other equation, i.e. du/dt+U*du/dn, is not equivalent to that. The difference between a straight vertical and curved boundary is that in the former case the implementation of du/dx is easier. You'll have to think how to express du/dx across the curved boundary, and that will indeed involve du/dn, but it's not equal.

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