Difference between pressure outlet and outflow

July 11, 2006, 15:40

I want to simulate a turbulent flow in a rectangular channel, what is the difference between pressure outlet and outflow in bondary condition.

July 11, 2006, 16:57

The pressure outflow means, the flow at exist is monitored with some specified pressure... In this case, the flow may or may not achieve the fully developed state.

Outflow condition assumes a zero diffusion flux for all flow variables. Physically it is consistent with a fully-developed flow assumption, when there is no area change at the outflow boundary. In this, only the diffusion fluxes in the direction normal to the exit plane are assumed to be zero.

July 11, 2006, 17:39

thank you, but in ma simulation the fully-developed flow is the boundary condition in outlet, so I want to use outflow.

maysmech · February 13, 2011, 01:57

Hi,

If the case be multiphase which one should be used when we want exit of one of species to outlet.

regards.

July 11, 2006, 15:40	Difference between pressure outlet and outflow	#1
ck1973 Guest Posts: n/a	I want to simulate a turbulent flow in a rectangular channel, what is the difference between pressure outlet and outflow in bondary condition.

July 11, 2006, 16:57	Re: Difference between pressure outlet and outflow	#2
ramp Guest Posts: n/a	The pressure outflow means, the flow at exist is monitored with some specified pressure... In this case, the flow may or may not achieve the fully developed state. Outflow condition assumes a zero diffusion flux for all flow variables. Physically it is consistent with a fully-developed flow assumption, when there is no area change at the outflow boundary. In this, only the diffusion fluxes in the direction normal to the exit plane are assumed to be zero.

July 11, 2006, 17:39	Re: Difference between pressure outlet and outflow	#3
ck1973 Guest Posts: n/a	thank you, but in ma simulation the fully-developed flow is the boundary condition in outlet, so I want to use outflow.

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February 13, 2011, 01:57		#4
maysmech Senior Member Maysam Join Date: Jan 2010 Posts: 308 Blog Entries: 2 Rep Power: 6	Hi, If the case be multiphase which one should be used when we want exit of one of species to outlet. regards.