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cavity example , boundary condition question

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Old   April 9, 2015, 16:28
Default cavity example , boundary condition question
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Hello friends,

my question is in regard to the first solved example in openFoam user guide, Cavity. why we assume that the pressure boundary condition at all walls is zero gradient ?. I mean how can we conclude to this condition from the NS equation.

thanks.
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Old   April 9, 2015, 17:17
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Quote:
Originally Posted by khalifa View Post
Hello friends,

my question is in regard to the first solved example in openFoam user guide, Cavity. why we assume that the pressure boundary condition at all walls is zero gradient ?. I mean how can we conclude to this condition from the NS equation.

thanks.
Please view this explanation from another user on the forum:

zero gradient pressure B/C
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