Pressure boundary conditions for a walled domain -- CFD Online Discussion Forums

March 21, 2012, 00:40	Pressure boundary conditions for a walled domain	#1
Jeffzda New Member Jeff Cumpston Join Date: Oct 2011 Posts: 8 Rep Power: 14	Hi there, For a computational domain with the outside boundary of type 'wall', what is the difference between specifying the pressure boundary conditions as 'zeroGradient' and specifying it as 'calculated; value $internalfield' (the latter is as found in the hotRoom tutorial for buoyantBoussinesqPimpleFoam solver)? Wouldn't the 'calculated' value just be the value for the pressure that was calculated for the cells adjacent to the wall, vis a vis zeroGradient? Thanks for your time! Jeff

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