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-   -   Outflow boundary condition in FLUENT (https://www.cfd-online.com/Forums/fluent/32496-outflow-boundary-condition-fluent.html)

Sri November 12, 2003 04:53

Outflow boundary condition in FLUENT
 
Hi.....

I am new to FLUENT. I am unable to understand what OTUFLOW boundary condition means in FLUENT 5/6 solver. The only thing I could get is that it can be used in case of pipes where flow is being divided and u have the convenience of specifying the mass flow ratio into each branch. For my case, I have a single pipe and so it would be 1.

But what are the conditions it uses, when we specify OTUFLOW as the boundary condition.

Does it assume fully developed flow condition at that end?

ap November 12, 2003 12:25

Re: Outflow boundary condition in FLUENT
 
See the manual here:

http://p2chpd-cluster.univ-lyon1.fr/...ug/node201.htm

Hi :)

ap

Sri November 15, 2003 20:58

Outflow boundary condition in FLUENT
 
Hi ap,

Thank you for the information. But it still remains doubtful about what information it extrapolates from the interior. Does it mean that it takes the boundary condition to be that existing just prior to the end of our geometry??

I also came across another posting which said that outflow boundary conditions typically assume fully developed flow type conditions. This confused me. But I think I am getting a feel of it now.

Thanx for the help once again

Alamgir November 18, 2003 21:53

Re: Outflow boundary condition in FLUENT
 
outflow bc is needed to be set to initialize how much fluid will be flowed out of the system/geometry. and it is assumed to be fully developed.

Alamgir

Sri November 22, 2003 21:56

some more on: Outflow boundary condition in FLUENT
 
can we have two mass flow inlet boundary conditions for a sinlge outflow......?? I guess it shouldnt be a problem. Thax to one and all for their response.

Sri

ap December 5, 2003 05:42

Re: some more on: Outflow boundary condition in FL
 
Yes. You can define as many inlet as you want.

Hi :)

ap


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