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Outflow boundary condition

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Old   April 1, 2016, 06:09
Default Outflow boundary condition
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I know that in outflow boundary we assume a zero normal gradient condition and use upwind scheme for approximation. However, I saw this sentence in a book which I do not understand; "Convective fluxes are usually assumed to be independent of the coordinate normal to an outflow boundary." What does it exactly mean and why are we allowed to make that assumption?

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Old   April 1, 2016, 08:18
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it means that the normal derivative to the outflow plane is zero
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