# Symmetry and boundary conditions

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 October 30, 2003, 07:39 Symmetry and boundary conditions #1 eric Guest   Posts: n/a Hi, I have values for mass flow rate for flow in a pipe, from which I calculate the inlet velocity. I'm using symmetry, to reduce computation time, therefore i have half the domain of the pipe. My question is - do I apply the full, calculated, inlet velocity as the boundary condition or do I halve the inlet velocity, because of the half pipe, and then double the values of the results? Thanks in advance, Eric.

 October 30, 2003, 07:49 Re: Symmetry and boundary conditions #2 David Guest   Posts: n/a Hi, no reason to half the inlet velocity, as you are using a symmetry and indicated it in your BCs. cheers David

 October 30, 2003, 10:52 Re: Symmetry and boundary conditions #3 ap Guest   Posts: n/a I agree with David. You have to specify the real velocity inlet.

 August 30, 2012, 09:09 boundary condition (symmetry vs periodic doubt) #4 Senior Member   kunar Join Date: Nov 2011 Posts: 117 Rep Power: 7 Dear friends, i am doing 3D wing analysis, i have doubt on boundary conditions in fluent ie both symmetry and periodic, anybody have the answer please let me know briefly,for what kind of purpose to use symmetry & periodic boundary conditions, please tell any example with problem.

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