karman-vortex hitting airfoil. solver-question.

Doktor_Gonzo · May 15, 2015, 11:20

Hi everybody!

Im trying to modell to following case:

a cylinder creates a karman-vortex, which hits a naca 0012-airfoil and creates turbulences.

right now im trying pimpleFoam with the k-epsilon-modell. But i really would like to know if there are any better ways to realize this case. simplefoam? k-omega? i guess the biggest problem ist creating a laminar and turbulent flow in one case.

i think i've got enough cells. maybe i need some more experience and advices when it comes to set the correct boundary-conditions. however, my simulation runs and im waiting for the vortex, but my notebook doesn't has the performance for fast results.

it's actually calculating 10 hours for 1 second. :-D

nimasam · May 18, 2015, 11:12

looking for steady state condition

, so i suggest using simpleFoam.
Also run the case in laminar, after the convergence is met, turn on turbulence

vatavuk · May 19, 2015, 06:19

Hi,
I think you won't get a von Karman vortrex street using a steady state solver. PimpleFoam seems to be the best transient solver available in OpenFOAM. I suggest that you search in the forum for ways to tune up the solver to get a better performance.
Best regards,
Paulo

May 15, 2015, 11:20	karman-vortex hitting airfoil. solver-question.	#1
Doktor_Gonzo New Member Join Date: May 2015 Posts: 3 Rep Power: 10	Hi everybody! Im trying to modell to following case: a cylinder creates a karman-vortex, which hits a naca 0012-airfoil and creates turbulences. right now im trying pimpleFoam with the k-epsilon-modell. But i really would like to know if there are any better ways to realize this case. simplefoam? k-omega? i guess the biggest problem ist creating a laminar and turbulent flow in one case. i think i've got enough cells. maybe i need some more experience and advices when it comes to set the correct boundary-conditions. however, my simulation runs and im waiting for the vortex, but my notebook doesn't has the performance for fast results. it's actually calculating 10 hours for 1 second. :-D

May 18, 2015, 11:12		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	looking for steady state condition, so i suggest using simpleFoam. Also run the case in laminar, after the convergence is met, turn on turbulence __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

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May 19, 2015, 06:19		#3
vatavuk Senior Member Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 17	Hi, I think you won't get a von Karman vortrex street using a steady state solver. PimpleFoam seems to be the best transient solver available in OpenFOAM. I suggest that you search in the forum for ways to tune up the solver to get a better performance. Best regards, Paulo