# Much Difference on my airfoil simulation

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November 3, 2009, 03:00
Much Difference on my airfoil simulation
#1
Senior Member

Join Date: Aug 2009
Location: Surabaya, Indonesia
Posts: 153
Rep Power: 9
Hi All,
I'm simulating 2 kind of turbulance model on an airfoil, i.e K Epsilon & SST. but there is much differences. I dont know where is my fault!!
Help me out this problem,
Thanks
teguhtf

P.S. I attach the report and figure of each turbulence condition
Attached Images
 AIRFOIL SST.JPG (89.1 KB, 39 views) AIRFOIL K EPSILON.JPG (86.6 KB, 29 views)
Attached Files
 SST.txt (18.6 KB, 13 views) K EPSILON.txt (18.8 KB, 9 views)

Last edited by teguhtf; November 3, 2009 at 03:49.

 November 16, 2009, 13:21 #2 Member   Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 10 It doesn´t look good to me, how are the residuals??

 November 21, 2009, 21:04 #3 Senior Member     teguh hady Join Date: Aug 2009 Location: Surabaya, Indonesia Posts: 153 Rep Power: 9 Hi Figd84 Thanks for your reply. my simulation has converged on iteration. Btw, How i can see convergence on residual graph?? Because I think if the solution has converged, i ignore the residual. Thank You teguh PS. I'll Post my residual graph later __________________ Now Or Never!!!

 November 23, 2009, 01:51 #4 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 From your pictures I can't see any outlet (I see only a blue edge which means inlet). If I am right, then it might be your error, since you don't have mass conservation __________________ In memory of my friend Hervé: CFD engineer & freerider

 December 4, 2009, 07:43 #5 Senior Member     teguh hady Join Date: Aug 2009 Location: Surabaya, Indonesia Posts: 153 Rep Power: 9 I'm sorry to be late on the reply. I've focused on my fabrication on the turbine for a while. Yes, You are right. I use wrong BC.^^ I've tried some of type of BC and take a note on it. Now, I'm still working by up & down wall (free slip) and the inlet is velocity inlet & outlet is press outlet. thank's teguhtf __________________ Now Or Never!!!

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