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-   -   How to set "Far field boundary condition" (http://www.cfd-online.com/Forums/cfx/22741-how-set-far-field-boundary-condition.html)

erick June 21, 2006 03:26

How to set "Far field boundary condition"
 
Dear Friends,

In my simulation, compressible fluid jets from a nozzle(outlet) into atmosphere, at inlet of the nozzle, the pressure, temperature and velocity is known. How to set the boundary condition at outlet? Maybe set "average static pressure"=0 at outlet is not good.

Could you help me? Many thanks.

Eric.

Joe June 21, 2006 07:28

Re: How to set "Far field boundary condition"
 
Depends on any intermediate geometry between the nozzle outlet and the farfield. Either a outlet or opening type BC could be appropriate...

erick June 21, 2006 07:33

Re: How to set "Far field boundary condition"
 
Dear Mr. Joe,

Could you explain it in detail? It is really important to me, Many thanks

Eric

Joe June 21, 2006 11:06

Re: How to set "Far field boundary condition"
 
Post pics of your geometry of interest.

Robin June 21, 2006 13:08

Re: How to set "Far field boundary condition"
 
Hi Erick,

At the opposite end, a constant static pressure outlet would suffice. On the top or sides, use an opening with static pressure and no direction. These should also be sufficiently far away from your jet.

Regards, Robin


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