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Finding volume flow rate through a car

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Old   September 23, 2011, 14:12
Default Finding volume flow rate through a car
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Dear friends.

I modeled a car with an air inlet and outlet, and am required to find out the volume flow rate through the car due to the inlet and outlet.
I have tried going to reports > surface integral and selected 'interior-car' as the surface of interest, but I get a value of about -1000 m3/s.
The domain size is about 20x the car's frontal area and has an inlet flow rate of 4000 m3/s, so im very sure that value is totally wrong. Please give me advice on how to attain this value.

Thank you!
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