Pressure outlet boundary condition -- CFD Online Discussion Forums

October 29, 2012, 12:50	Pressure outlet boundary condition	#1
new_at_this Member Peter Join Date: Oct 2011 Posts: 52 Rep Power: 15	I am trying to reproduce a two-phase simulation performed in Fluent. The problem is a two phase flow in a circular duct. At the inlet I have specified the velocity. Originally at the duct exit I specified outflow boundary conditions as: $\frac{\partial u}{\partial z} = 0$ However I believe that the correct boundary conditions should be pressure outlet, not outflow. Mathematically, how is pressure outlet defined?

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