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Hi, I am modelling heat transfer, (natural and forced convection) of a cabinet with an internal heat source. Please see attached figure. I am using the Boussinesq approximation and including gravity so need to use 'Hydrostatic pressure on' setting. Can someone please explain where to set the hydrostatic pressure origin? Am I right to assume it is in the middle of my outflow surface that is venting to atmosphere? Thanks in advance.