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CFX-Net Head Gain Calculation

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Old   December 30, 2020, 14:03
Default CFX-Net Head Gain Calculation
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Hello,

I am currently designing a pump that is from CFTurbo. To analyze it I am using CFX but when I get results in the expression tab I cannot see the net head gain.
So I decided to create my own expression but I failed.
This my expression
(massFlowAve(Total Pressure)@volute outlet-massFlowAve(Total Pressure)@R1 Inlet)/(1050*9.81)
So how can I achieve to define it?
Or is there any solution it to solve automatically?

Thank you.
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Old   December 30, 2020, 16:59
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Why do you think it failed? Did you get an error or warning?
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Old   December 30, 2020, 17:15
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Quote:
Originally Posted by Gert-Jan View Post
Why do you think it failed? Did you get an error or warning?
for example increasing the mass flow rate should result in decreasing the net head gained.
In the parametric study I chose 5 design points in 3 of 5 trend is like that but after 6L/min it suddenly increases and continue like that
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Old   December 31, 2020, 04:34
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It is difficult to say what went wrong. It could be anything. It depends a lot on how you have setup your case.
Are you convinced it has converged? Do you monitor this equation during the solving process?
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