# outlet conditions

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 January 15, 2004, 03:23 outlet conditions #1 tzapelina Guest   Posts: n/a Hello everybody! I am a beginner and I'm trying to write a q1 file in PIL. my case is : single room with a fire and i'm following the example from the library. I cant't understand why the velocities at the outlet are all set to 0.0. outlet(venta,low, etc...) value(venta,p1,0.0) value(venta, u1,0.0) value(venta,v1,0.0) value(venta,w1,0.0) Pls help!

 January 15, 2004, 07:22 Re: outlet conditions #2 another Guest   Posts: n/a The specified velocity values are external velocity values. They are only used in the event that inflow (Pexternal > Pin-cell) is predicted through the outflow boundary. A zero value means that an incoming momentum is considered negligible, which in general may not be the case. If outflow is predicted (Pexternal < Pin-cell) through the outlet boundary, then the in-cell velocity values are convected out of the solution domain.

 January 16, 2004, 00:07 Re: outlet conditions #3 Leon Mills Guest   Posts: n/a It would appear that the 'oultet' is set up like an opening (think open window). With this in mind air, smoke would leave the room only when there is a suffcient increase in pressure in the room relative to atmosphere to drive the hot gasses out of the room. hope this helps. Leon

 January 16, 2004, 05:07 Re: outlet conditions #4 tzapelina Guest   Posts: n/a Thank you very much for your help! Have a nice day everybody. Tzapelina

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