How can I calculate the head , power, and efficiency of a pump?

Ahmed Saeed Mansour · March 26, 2016, 20:55

I have carried out 4 simulations on a centrifugal pump using fluent at 4 flow rates and I want to know how can I know the value of the head,the efficiency and the eff.? Is there a direct method in fluent to know these values?
Thanks.

LuckyTran · March 28, 2016, 12:07

These are all bulk quantities that are better to calculate by hand. The problem with bulk quantities is they have too many variations to their definitions that are user specific. For example, dynamic head as one-half the density times the velocity squared sounds simple on paper until you get to a 3D problem with real temperature & pressure dependent properties. Then there are plenty of ways to compute and average dynamic head depending on whether you average the local dynamic head at each cell, or calculate it from average density and bulk velocity.

Just get the properties you need from Fluent and then calculate them externally in excel or whatever. If it is only 4 cases then is the fastest approach. If you need to automate it, you will have to get creative with reports, udf's, or custom field functions.

Ahmed Saeed Mansour · March 28, 2016, 12:14

Thank you sir.

March 26, 2016, 20:55	How can I calculate the head , power, and efficiency of a pump?	#1
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	I have carried out 4 simulations on a centrifugal pump using fluent at 4 flow rates and I want to know how can I know the value of the head,the efficiency and the eff.? Is there a direct method in fluent to know these values? Thanks.

March 28, 2016, 12:07		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,763 Rep Power: 66	These are all bulk quantities that are better to calculate by hand. The problem with bulk quantities is they have too many variations to their definitions that are user specific. For example, dynamic head as one-half the density times the velocity squared sounds simple on paper until you get to a 3D problem with real temperature & pressure dependent properties. Then there are plenty of ways to compute and average dynamic head depending on whether you average the local dynamic head at each cell, or calculate it from average density and bulk velocity. Just get the properties you need from Fluent and then calculate them externally in excel or whatever. If it is only 4 cases then is the fastest approach. If you need to automate it, you will have to get creative with reports, udf's, or custom field functions. Ahmed Saeed Mansour likes this.

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March 28, 2016, 12:14		#3
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Thank you sir.