Much Difference on my airfoil simulation

teguhtf · November 3, 2009, 02:00

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

Figd84 · November 16, 2009, 12:21

It doesn´t look good to me, how are the residuals??

teguhtf · November 21, 2009, 20:04

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

-mAx- · November 23, 2009, 00:51

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

teguhtf · December 4, 2009, 06:43

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

November 21, 2009, 20:04		#3
teguhtf Senior Member teguh hady Join Date: Aug 2009 Location: Saga, Japan Posts: 222 Rep Power: 17	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, 00:51		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	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, 06:43		#5
teguhtf Senior Member teguh hady Join Date: Aug 2009 Location: Saga, Japan Posts: 222 Rep Power: 17	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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November 16, 2009, 12:21		#2
Figd84 Member Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 17	It doesn´t look good to me, how are the residuals??