Multi-element airfoil

aaronlong · March 6, 2011, 16:33

Hello,
I'm new to CFD and I'm running a 2D multi-element wing in STAR-CCM at various angles to measure the lift and drag coefficients. I have tried using different meshes and I have been unable to get the results and stall point to match with previous results.
I am using a k-epsilon turbulent, consent density model.

What can i change to give me accurate results?

aaronlong · March 6, 2011, 16:42

I forgot to mention that the wing is in air at 30 m/s

nomad · March 15, 2011, 19:36

From my experience with multi-element airfoils, kepsilon gives a more accurate Clmax, but doesn't indicate stall angle correctly, whereas the transition model seems to predict stall angle correctly but underestimates the Clmax.
I don't think there is anything out there available commercially that does a good job of predicting stall, but I could be wrong.

PB4 · April 1, 2011, 07:47

also, stall means flow separation which I gathered from these forums makes the problem unsuitable for 2D, you should work in 3D instead.. but my experience in CFD is very low I stand corrected..

March 6, 2011, 16:33	Multi-element airfoil	#1
aaronlong New Member Aaron Long Join Date: Mar 2011 Posts: 2 Rep Power: 0	Hello, I'm new to CFD and I'm running a 2D multi-element wing in STAR-CCM at various angles to measure the lift and drag coefficients. I have tried using different meshes and I have been unable to get the results and stall point to match with previous results. I am using a k-epsilon turbulent, consent density model. What can i change to give me accurate results?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problem running simpleFoam on a multi element airfoil	vinz	OpenFOAM Running, Solving & CFD	18	April 11, 2013 11:26
Question about reference values --> Area (multi element wing)	Zweeper	FLUENT	7	March 28, 2010 11:29
Modelin Multi Element Airfoils	Yashwant Ganti	FLUENT	0	June 5, 2007 03:50
multi element airfoil data	shadi memarpour	Main CFD Forum	0	June 20, 2004 04:33
Multi Element Airfoil	J.Dumas	Main CFD Forum	2	May 13, 2000 07:24

March 6, 2011, 16:42		#2
aaronlong New Member Aaron Long Join Date: Mar 2011 Posts: 2 Rep Power: 0	I forgot to mention that the wing is in air at 30 m/s

March 15, 2011, 19:36		#3
nomad Member John Join Date: Aug 2009 Posts: 92 Rep Power: 16	From my experience with multi-element airfoils, kepsilon gives a more accurate Clmax, but doesn't indicate stall angle correctly, whereas the transition model seems to predict stall angle correctly but underestimates the Clmax. I don't think there is anything out there available commercially that does a good job of predicting stall, but I could be wrong.

April 1, 2011, 07:47		#4
PB4 New Member Join Date: Sep 2010 Posts: 10 Rep Power: 15	also, stall means flow separation which I gathered from these forums makes the problem unsuitable for 2D, you should work in 3D instead.. but my experience in CFD is very low I stand corrected..