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What's the requirement of the derivative order of boundary conditions?

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Old   July 25, 2009, 00:47
Default What's the requirement of the derivative order of boundary conditions?
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What's the requirement of the derivative order of boundary conditions?

If my governing equations contain 3 variables, vorticity,u and v, the derivatives order of which are:

vorticity: 2nd/1st
u: 1st
v: 1st

Can I use 2nd order boundary conditions like d^2(u)/d(x)^2=0 on the outflow boundary?

Thank you in advance.
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