Vortex Shedding in low Reynold's Number 2D airfoil

Pacer · February 1, 2014, 01:22

Hi

I was simulating flow on a low Reynold's Number airfoil, eppler387. I have taken the Re No. as 60000 and angle of attack 4 degrees. In these conditions vortex shedding is supposed to occur. I simulated the problem using 3 Eq turbulence model K-Kl-w keeping laminar kinetic energy 1e-6, turbulence intensity 1% and turbulence length scale 0.0008. The results were good and I got behavior that was expected. However when I change to the 4 eq model Transition SST, I didnt
get the expected vortex shedding. As I do not have a lot of background knowledge on the subject I was wondering what might be the reason of such behavior?

3 Equation Model

4 Equation Model

atulurade · February 5, 2014, 04:20

you should go through the basics books of cfd you will get your answer or also you get it in fluid dynamics books..

February 1, 2014, 01:22	Vortex Shedding in low Reynold's Number 2D airfoil	#1
Pacer New Member Join Date: Jan 2014 Posts: 6 Rep Power: 12	Hi I was simulating flow on a low Reynold's Number airfoil, eppler387. I have taken the Re No. as 60000 and angle of attack 4 degrees. In these conditions vortex shedding is supposed to occur. I simulated the problem using 3 Eq turbulence model K-Kl-w keeping laminar kinetic energy 1e-6, turbulence intensity 1% and turbulence length scale 0.0008. The results were good and I got behavior that was expected. However when I change to the 4 eq model Transition SST, I didnt get the expected vortex shedding. As I do not have a lot of background knowledge on the subject I was wondering what might be the reason of such behavior? 3 Equation Model 4 Equation Model

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February 5, 2014, 04:20		#2
atulurade New Member Join Date: Jan 2014 Posts: 5 Rep Power: 12	you should go through the basics books of cfd you will get your answer or also you get it in fluid dynamics books..