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Old   January 15, 2004, 02:23
Default outlet conditions
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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!
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Old   January 15, 2004, 06:22
Default Re: outlet conditions
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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.
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Old   January 15, 2004, 23:07
Default Re: outlet conditions
Leon Mills
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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.

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Old   January 16, 2004, 04:07
Default Re: outlet conditions
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Thank you very much for your help!

Have a nice day everybody. Tzapelina
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