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fire in a tunnel simulation

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Old   April 12, 2013, 10:06
Lightbulb fire in a tunnel simulation
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We are working on a simulation of a fire in the middle of a tunnel with some exhauster fans in the ceiling.

At the moment, our model works fine in the horizontal position, but when we try to decompose the gravity in 2 directions, the results aren't logical: the sense of the flux in the fans changes over the time, and in some areas there is a excecive velocity.

We would appreciate if someone explains us why our flux in the fans changes its direction, even after we require a presure gauge.
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fan boundary condition, fire simulation, tunnel

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