Head (m) as in put parametrer

obliqueshrestha · January 1, 2014, 00:14

How to input head (m) as a input parameter??? I have tried using this constant mass flow rate in different guide vane angles but the result of head head varies from 750 m to 12 m which in my veiw no possible.

My script is

LIBRARY:
CEL:
EXPRESSIONS:
Accumulated Time Step = 100
Angular Velocity = 529 [rev min^-1]
Current Time Step = 100
H net = Hin -Hout
Head = Total Pressure in Stn Frame/gama
Hin = massFlowAve(Head )@Inlet
Hout = massFlowAve(Head )@Outlet
Hydraulic power = gama *Q *H net
Q = massFlow()@Inlet /massFlowAve(Density)@Inlet
Reference Pressure = 1 [atm]
Sequence Step = 100
Time = 0 [s]
atstep = Accumulated Time Step
ctstep = Current Time Step
efficiency = (shaft power /Hydraulic power )*100
gama = 9806 [N*m^-3]
omega = Angular Velocity
shaft power = (torque_x()@Rotating Default )*(omega*2*pi/(360[degree]))
sstep = Sequence Step
t = Time
END
END
END

Please help me with this matter

ghorrocks · January 1, 2014, 04:22

WHy not just define the inlet as a total pressure boundary and the outlet as a pressure boundary? Then you simply define the pressure loss over the system. Read the documentation section on "Choice of boundary conditions" for further details.

January 1, 2014, 00:14	Head (m) as in put parametrer	#1
obliqueshrestha New Member Oblique Shrestha Join Date: Sep 2013 Posts: 1 Rep Power: 0	How to input head (m) as a input parameter??? I have tried using this constant mass flow rate in different guide vane angles but the result of head head varies from 750 m to 12 m which in my veiw no possible. My script is LIBRARY: CEL: EXPRESSIONS: Accumulated Time Step = 100 Angular Velocity = 529 [rev min^-1] Current Time Step = 100 H net = Hin -Hout Head = Total Pressure in Stn Frame/gama Hin = massFlowAve(Head )@Inlet Hout = massFlowAve(Head )@Outlet Hydraulic power = gama Q H net Q = massFlow()@Inlet /massFlowAve(Density)@Inlet Reference Pressure = 1 [atm] Sequence Step = 100 Time = 0 [s] atstep = Accumulated Time Step ctstep = Current Time Step efficiency = (shaft power /Hydraulic power )100 gama = 9806 [Nm^-3] omega = Angular Velocity shaft power = (torque_x()@Rotating Default )(omega2*pi/(360[degree])) sstep = Sequence Step t = Time END END END Please help me with this matter

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to calculate mass flow rate on patches and summation of that during the run?	immortality	OpenFOAM Post-Processing	104	February 16, 2021 08:46
How to apply pressure 6.2psi on the upper spinnig head	msormania	CFX	0	April 26, 2012 19:25
Why you call it pressure head	arphy	Main CFD Forum	0	March 6, 2011 12:08
FLUENT shows higher head on the turbine	Sanjay Jain	FLUENT	0	June 3, 2008 08:41
how to replace piston head in the es-ice software	Julian	Siemens	1	December 20, 2007 00:18

January 1, 2014, 04:22		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	WHy not just define the inlet as a total pressure boundary and the outlet as a pressure boundary? Then you simply define the pressure loss over the system. Read the documentation section on "Choice of boundary conditions" for further details.