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-   -   Symmetry and boundary conditions (http://www.cfd-online.com/Forums/fluent/32412-symmetry-boundary-conditions.html)

eric October 30, 2003 07:39

Symmetry and boundary conditions
 
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.

David October 30, 2003 07:49

Re: Symmetry and boundary conditions
 
Hi,

no reason to half the inlet velocity, as you are using a symmetry and indicated it in your BCs.

cheers

David

ap October 30, 2003 10:52

Re: Symmetry and boundary conditions
 
I agree with David.

You have to specify the real velocity inlet.

hhh August 30, 2012 09:09

boundary condition (symmetry vs periodic doubt)
 
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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