Centrifugal pump

svenki7 · October 22, 2014, 06:52

Hi,
I am working on Cavitation in Centrifugal pumps. I have experimental data for discharge(l/s) and Total head (m). First I am matching Head vs Discharge graph in steady state for single phase flow (water, with out cavitation).

My Boundary conditions used:
Inlet: Mass flow
Outlet: Pressure Outlet
RPM: 2000
But for above boundary conditions Head is not matching.

Another trail:
Inlet: Pressure Outlet
Outlet: Mass flow
RPM: 2000
But for above boundary also conditions Head is not matching.

I saw some publications on pumps. Most of the authors used above boundary conditions. I am new to this area.

Can you suggest me boundary conditions for getting Head Vs Discharge graph.

Any help will appreciate .

Thanks in Advance

Venkat

swiftaircraft · October 22, 2014, 13:57

A you using the Sliding Mesh Model or one of the others?

svenki7 · October 28, 2014, 09:46

i am using MRF (moving reference frame).

mhmt · May 24, 2016, 02:22

You can use mass flow inlet and static pressure outlet BCs but make sure that your calculation domain is extended enough at the pump inlet and outlet.
If this is not the case, the outlet BC can detoriate the pressure field and lead wrong inlet presuures.

October 22, 2014, 06:52	Centrifugal pump	#1
svenki7 New Member venkat Join Date: Apr 2013 Posts: 14 Rep Power: 13	Hi, I am working on Cavitation in Centrifugal pumps. I have experimental data for discharge(l/s) and Total head (m). First I am matching Head vs Discharge graph in steady state for single phase flow (water, with out cavitation). My Boundary conditions used: Inlet: Mass flow Outlet: Pressure Outlet RPM: 2000 But for above boundary conditions Head is not matching. Another trail: Inlet: Pressure Outlet Outlet: Mass flow RPM: 2000 But for above boundary also conditions Head is not matching. I saw some publications on pumps. Most of the authors used above boundary conditions. I am new to this area. Can you suggest me boundary conditions for getting Head Vs Discharge graph. Any help will appreciate . Thanks in Advance Venkat

October 22, 2014, 13:57		#2
swiftaircraft Member David Stanbridge Join Date: Apr 2010 Location: Norwich, UK Posts: 59 Rep Power: 16	A you using the Sliding Mesh Model or one of the others? __________________ David Stanbridge Swift TG Solutions Limited www.swifttgsolutions.com

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October 28, 2014, 09:46		#3
svenki7 New Member venkat Join Date: Apr 2013 Posts: 14 Rep Power: 13	i am using MRF (moving reference frame).

May 24, 2016, 02:22		#4
mhmt New Member Mehmet Kaya Join Date: Jan 2010 Posts: 10 Rep Power: 16	You can use mass flow inlet and static pressure outlet BCs but make sure that your calculation domain is extended enough at the pump inlet and outlet. If this is not the case, the outlet BC can detoriate the pressure field and lead wrong inlet presuures.