Prediction of stall point

cfdeng · February 21, 2013, 12:31

Hi everyone,

I would like to know if anyone one here knows a way to predict the stall point? For capturing stall point, I reduce the exit corrected massflow (or increase back pressure) till I get to stall. However, this method could be very time consuming, because several exit corrected mass flow rates should be tried to find the one after which stall happens. I am looking for a way to find stall point with the least number of calculations.BTW, I am working on a one stage fan.
Any suggestion is appreciated.

ghorrocks · February 21, 2013, 16:30

CFX predicts the flow at a given configuration. Think of it like a numerical experiment. So you are going to have to sweep over a parameter (flow rate, AOA, turbulence levels, whatever) to find the stall point.

You can speed things up by using smart curve fitting to the simulation results, for instance you can guess to some level what the stall point will be, so centre your search there.

February 21, 2013, 12:31	Prediction of stall point	#1
cfdeng New Member Join Date: Jan 2013 Posts: 3 Rep Power: 13	Hi everyone, I would like to know if anyone one here knows a way to predict the stall point? For capturing stall point, I reduce the exit corrected massflow (or increase back pressure) till I get to stall. However, this method could be very time consuming, because several exit corrected mass flow rates should be tried to find the one after which stall happens. I am looking for a way to find stall point with the least number of calculations.BTW, I am working on a one stage fan. Any suggestion is appreciated.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problem with UDF compiling for kTkLW model	Wantami	FLUENT	0	July 18, 2011 05:11
matching variable data with grid point data	anfho	OpenFOAM Programming & Development	0	May 6, 2011 15:28
Plot data for a fixed point	aut_iut	OpenFOAM	0	December 23, 2010 05:16
Can't see the point, streamline and line in Post	Atit	CFX	0	October 28, 2004 14:53
static stall	atrh	Main CFD Forum	1	March 9, 2004 06:07

February 21, 2013, 16:30		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	CFX predicts the flow at a given configuration. Think of it like a numerical experiment. So you are going to have to sweep over a parameter (flow rate, AOA, turbulence levels, whatever) to find the stall point. You can speed things up by using smart curve fitting to the simulation results, for instance you can guess to some level what the stall point will be, so centre your search there.