Opening Boundary Condition

shahid nadeem · February 4, 2014, 06:39

My Dear Friends can anybody tell me whats the difference between Outlet or Inlet and Opening Boundary Condition

tb_cfd · February 5, 2014, 16:14

Hello,

the inlet boundary condition is for boundaries where the fluid predominantly flows into the domain. When you have a flow which is predominantly out of the domain you use the outlet boundary condition. At an opening the fluid can flow simultaneously both in and out of the domain.
That means either all of the fluid might flow in to the domain at the opening or all of the fluid might flow out of the domain or a mixture of in- and outflow might occur.

shahid nadeem · February 6, 2014, 00:17

Thank You Very Much tb_CFd. I am Clear now, But in the Outlet Condition also we are providind some Backflow conditions right what do you say about it.

Far · February 17, 2014, 01:22

we do not specify back flow condition in CFX, it is done in Fluent

shahid nadeem · February 17, 2014, 06:56

Y it is such what is the difference with fluent and cfx here

February 4, 2014, 06:39	Opening Boundary Condition	#1
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 12	My Dear Friends can anybody tell me whats the difference between Outlet or Inlet and Opening Boundary Condition

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February 5, 2014, 16:14		#2
tb_cfd New Member tb_cfd Join Date: May 2013 Posts: 8 Rep Power: 12	Hello, the inlet boundary condition is for boundaries where the fluid predominantly flows into the domain. When you have a flow which is predominantly out of the domain you use the outlet boundary condition. At an opening the fluid can flow simultaneously both in and out of the domain. That means either all of the fluid might flow in to the domain at the opening or all of the fluid might flow out of the domain or a mixture of in- and outflow might occur.

February 6, 2014, 00:17		#3
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 12	Thank You Very Much tb_CFd. I am Clear now, But in the Outlet Condition also we are providind some Backflow conditions right what do you say about it.

February 17, 2014, 01:22		#4
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	we do not specify back flow condition in CFX, it is done in Fluent

February 17, 2014, 06:56		#5
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 12	Y it is such what is the difference with fluent and cfx here