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plz help:"outflow" BC problem

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Old   June 12, 2008, 10:04
Default plz help:"outflow" BC problem
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hello, Am trying to find the HTCs in circular jet impingement cooling of air on a metal plate. The inlet is thru a nozzle of dia 1" and the outflow is thru the curved area of cylinder dia 10" and height 2". The outlet boundry condn is "OUTFLOW". It's creating a lot of convergence issues bcoz there is back flow, actually there is recirculation, is the reverse flow because of that, will it be solved if i increase my domain.

_____________________| ! |_______________________

<----.................................................. .................................------->

_______________________________________________ <--the cooled plate

Another q is that can i use two symetric BC to model a circular section of 30 deg like this" <)" hope you got it
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Old   June 12, 2008, 17:12
Default Re: plz help:"outflow" BC problem
red lemon
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Move outlets further away to capture recirculation and use stagnation pressure (pressure outlet) condition instead.

On second point you can use rotational periodics for that. Both flat faces represent the periodic zone and these can be conformal or non conformal in fluent.

If you can guarantee (big if!) that flow is axial then don't use periodic sector with symmetries as you can model as 2D axi-symmetric as it will solve quicker. Otherwise use the 3D periodic approach described. This latter option may be the safer one.
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