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volumetric flow rate is fluctuating in outlet boundary condition location

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Old   November 30, 2016, 02:59
Default volumetric flow rate is fluctuating in outlet boundary condition location
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Onur Özcan
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I have modelled a control volume. All boundaries in the control volume are outlet boundary condition that is open to atmosphere. I have never seen or run across problem in inlet boundary condition but for outlet boundary condition has, velocity in outlet boundary condition is nonsensically still increasing and volumetric flow rate is fluctuating as well.

What is the reason(s) of effect this phenomena?

Kind Regards,
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Old   November 30, 2016, 03:00
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Onur Özcan
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Quote:
Originally Posted by oozcan View Post
I have modelled a control volume. All boundaries in the control volume are outlet boundary condition that is open to atmosphere. I have never seen or run across problem in inlet boundary condition but for outlet boundary condition has, velocity in outlet boundary condition is nonsensically still increasing and volumetric flow rate is fluctuating as well.

What is the reason(s) of effect this phenomena?

Kind Regards,
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File Type: jpg volumetric flow rate for outlet.jpg (116.2 KB, 6 views)
File Type: jpg velocity for outlet.jpg (123.2 KB, 4 views)
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