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-   -   Direction of a Neumann BC (http://www.cfd-online.com/Forums/openfoam-solving/91813-direction-neumann-bc.html)

fisch August 23, 2011 10:09

Direction of a Neumann BC
 
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

stevenvanharen August 24, 2011 07:32

I think if you read Jasak's thesis page 94-95 this will be clarified for you.

fisch August 24, 2011 07:56

thanks steven,

so it points always outwards.


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