NACA 2412 post-stall

DanijelB98 · May 27, 2021, 04:17

Hi, i have a question. I study this airfoil, but can I use standard model (k-w sst or sst transition) to study this airfoil after stall at 16 degree? Which models can i use?

LoGaL · May 27, 2021, 08:24

As I said in the other post, use the normal k-omega SST. Stall is not turbulence. At your Reynolds number the flow is 99,9999% turbulent, you don't need to predict laminar to turbulent transition. What you should instead whether is whether to run a steady or an unsteady simulation, because stall is certainly not steady.

You can have stall both in laminar and turbulent flow.

DanijelB98 · May 27, 2021, 10:11

Yes, I use only K-w SST for my analysis. But I have another question. I want to compare numerical coeficent static pressure and Experimental coefficent pressure at an angle of pre stall (12 degree). In the front of airfoil I have good results but in the final part no. What a problem could be? I have separation fot this angle at 0.92c

LoGaL · May 28, 2021, 17:10

Hi, if you want to predict the stalled part, you need to run unsteady simulation and then take time average statistics

May 27, 2021, 04:17	NACA 2412 post-stall	#1
DanijelB98 New Member Danijel Join Date: May 2021 Posts: 5 Rep Power: 4	Hi, i have a question. I study this airfoil, but can I use standard model (k-w sst or sst transition) to study this airfoil after stall at 16 degree? Which models can i use?

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May 27, 2021, 08:24		#2
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 373 Rep Power: 12	As I said in the other post, use the normal k-omega SST. Stall is not turbulence. At your Reynolds number the flow is 99,9999% turbulent, you don't need to predict laminar to turbulent transition. What you should instead whether is whether to run a steady or an unsteady simulation, because stall is certainly not steady. You can have stall both in laminar and turbulent flow.

May 27, 2021, 10:11		#3
DanijelB98 New Member Danijel Join Date: May 2021 Posts: 5 Rep Power: 4	Yes, I use only K-w SST for my analysis. But I have another question. I want to compare numerical coeficent static pressure and Experimental coefficent pressure at an angle of pre stall (12 degree). In the front of airfoil I have good results but in the final part no. What a problem could be? I have separation fot this angle at 0.92c

May 28, 2021, 17:10		#4
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 373 Rep Power: 12	Hi, if you want to predict the stalled part, you need to run unsteady simulation and then take time average statistics