boundary condition for compressor

krunal_me00 · April 19, 2010, 07:59

hii to all.
I am doing work on FLUENT to analyze compressor with ideal gas.
but every time i am getting reversed flow or FLUENT having fatal error.
Boundary conditions I am using are:
Inlet : Pressure inlet
Outlet : pressure outlet
Solver : Density based (steady)
Hub,Shroud and side walls : Rotating (Relative to moving ref. frame; rpm=0)
Fluid : moving ref. frame (rpm = 5000)
my actual rpm is 40000 but i want to converge it first at 5000.
i am not giving any pressure or temp values at Outlet,as it should calculate on its own.Is it right??

need urgent reply...
Thank you.

Chris D · April 19, 2010, 12:55

But if there is reversed flow, then FLUENT uses the backflow values that you set. If those values aren't realistic, it could blow out your solution.

krunal_me00 · April 20, 2010, 01:57

my outlet static pressure is 3.2 atm and total rpm is 40000.
if i am giving this values directly then after few iterations it shows FULENT has fatal error....
so how should i go for the solution..??
thank u..

Chris D · April 20, 2010, 14:56

What does it say besides "Fatal Error"? Segmentation, Access_Violation? Are you using a UDF?

April 19, 2010, 07:59	boundary condition for compressor	#1
krunal_me00 New Member Krunal Join Date: Mar 2010 Posts: 11 Rep Power: 16	hii to all. I am doing work on FLUENT to analyze compressor with ideal gas. but every time i am getting reversed flow or FLUENT having fatal error. Boundary conditions I am using are: Inlet : Pressure inlet Outlet : pressure outlet Solver : Density based (steady) Hub,Shroud and side walls : Rotating (Relative to moving ref. frame; rpm=0) Fluid : moving ref. frame (rpm = 5000) my actual rpm is 40000 but i want to converge it first at 5000. i am not giving any pressure or temp values at Outlet,as it should calculate on its own.Is it right?? need urgent reply... Thank you.

April 20, 2010, 01:57	boundary condition for compressor	#3
krunal_me00 New Member Krunal Join Date: Mar 2010 Posts: 11 Rep Power: 16	my outlet static pressure is 3.2 atm and total rpm is 40000. if i am giving this values directly then after few iterations it shows FULENT has fatal error.... so how should i go for the solution..?? thank u..

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April 19, 2010, 12:55		#2
Chris D Senior Member Chris Join Date: Jul 2009 Location: Ohio, USA Posts: 169 Rep Power: 16	But if there is reversed flow, then FLUENT uses the backflow values that you set. If those values aren't realistic, it could blow out your solution.

April 20, 2010, 14:56		#4
Chris D Senior Member Chris Join Date: Jul 2009 Location: Ohio, USA Posts: 169 Rep Power: 16	What does it say besides "Fatal Error"? Segmentation, Access_Violation? Are you using a UDF?