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Flow rate reduction analysis

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Old   April 14, 2016, 08:11
Smile Flow rate reduction analysis
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hosein
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Hi all,
I am a new autodesk CFD user. and I want to analyze an air tunnel and my goal is to determine the amount of air out let volume. how i have to defined the boundaries?
mu boundary setup now is:
inlet Volume rate is 900 Cubic meter per hour.
out let pressure 0
all the other wall are set to slip.
But I received almost the same amount in outlet, but in a practical test I have had an almost 50% reduction in air flow.
what would be my mistake or unassign boundary?
Tanks for your help.
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Old   December 21, 2016, 08:02
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Jon Wilde
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In reality you have less flow exiting than you do entering?
This could only really be true with a high speed compressible study and only with volumetric flow rate, otherwise you really must have the same volume of flow entering and exiting.
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