Reynolds Stress Turbulence Model

cesar.14bis · April 24, 2010, 03:47

Hi all
I trying to calculate the drag and lift of a low-reynolds high-lift airfoil using RSTM model, but i'm having problems to activate this model. What i should do???

Thanks all

Cesar, from Brazil.

PS:I tried k-e model but the airfoil have separations zone that the k-e model can't simulate correctly. The results with k-e were far of the experimental data.

Linh.Hoang · April 26, 2010, 02:56

Hi Cesar,
I haven´t worked with the reynold stress model yet but why don´t you set the RSTM = T in the Q1 file? like told in Polis:
http://www.cham.co.uk/phoenics/d_pol...enc_r.htm#rstm

Have you tried this and it didn´t work?

Linh

Darren Leong · December 2, 2010, 22:28

Hi Cesar,

I've only so far explored the rstm models using ANSYS CFX. The k-e model is highly sensitive to the grid density/y+ around the foil shape. I suggest that you do a grid independence study and apply a SST model if avalaible in pheonics.

How far off were the results? ~15% is alright for initial validation of your model as the procedure's semi-blind unless you're really confident of your experiment data accuracy.

-Dazza

April 24, 2010, 03:47	Reynolds Stress Turbulence Model	#1
cesar.14bis New Member Cesar Laureti Join Date: Apr 2010 Posts: 2 Rep Power: 0	Hi all I trying to calculate the drag and lift of a low-reynolds high-lift airfoil using RSTM model, but i'm having problems to activate this model. What i should do??? Thanks all Cesar, from Brazil. PS:I tried k-e model but the airfoil have separations zone that the k-e model can't simulate correctly. The results with k-e were far of the experimental data.

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April 26, 2010, 02:56		#2
Linh.Hoang New Member Join Date: May 2009 Location: Germany Posts: 25 Rep Power: 17	Hi Cesar, I haven´t worked with the reynold stress model yet but why don´t you set the RSTM = T in the Q1 file? like told in Polis: http://www.cham.co.uk/phoenics/d_pol...enc_r.htm#rstm Have you tried this and it didn´t work? Linh

December 2, 2010, 22:28		#3
Darren Leong Member Darren Leong Join Date: Dec 2010 Posts: 64 Rep Power: 16	Hi Cesar, I've only so far explored the rstm models using ANSYS CFX. The k-e model is highly sensitive to the grid density/y+ around the foil shape. I suggest that you do a grid independence study and apply a SST model if avalaible in pheonics. How far off were the results? ~15% is alright for initial validation of your model as the procedure's semi-blind unless you're really confident of your experiment data accuracy. -Dazza