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Direction of a Neumann BC

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Old   August 23, 2011, 10:09
Default Direction of a Neumann BC
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fisch
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Hi,

i know that e.g. a Neumann BC for the pressure at a patch is defined as dp/dn where n is the normal to the wall.
My question is, in which direction points this normal vector?
Always in or out of the domain? Or how is it defined?

thanks a lot
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Old   August 24, 2011, 07:32
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Steven van Haren
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I think if you read Jasak's thesis page 94-95 this will be clarified for you.
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Old   August 24, 2011, 07:56
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thanks steven,

so it points always outwards.
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