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-   -   Boundary condition for exhaut flow with imposed mass flow (http://www.cfd-online.com/Forums/fluent/87641-boundary-condition-exhaut-flow-imposed-mass-flow.html)

stephane April 25, 2011 14:13

Boundary condition for exhaut flow with imposed mass flow
 
Hi,

I'm modeling the ventilation of a room with Fluent. At the inlet, I would like to use a velocity inlet BC. I have several outlets. I would like to impose the mass flow at these outlets. For instance, let's say I have an inlet with a mass flow equal to 1 kg/s and 2 outlets where the mass flow are equal to respectively 0.8 kg/s and 0.2 kg/s. Which BC should I use at the outlets? Can I use some velocity inlet BC at the outlets to impose the flowrate? Or should I use some pressure outlet boundaries with the target mass flow rate option? I could also use an outflow BC and adjust the flow rate weighting. What is the best approach.
Thanks in advance,
Stéphane

delaneyluke November 24, 2011 03:04

I assume your flow might be compressible. If so, the outflow condition will not be applicable. The pressure outlet BC with target mass flow is a better option.

Oops, this is a late reply. Hope it helps.

Regards
Luke


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