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how to get total mass of air through a surface

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Old   June 2, 2010, 08:14
Default how to get total mass of air through a surface
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李逾
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after a dynamic calculation,I want to calculate the total mass of air through a surface
but I can only get the mass flow rate in a certain time step using "surface intergral"
could anyone tell me what can I do
thanks in advance!
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