methods to initialize DNS turbulence field

songwukong · May 15, 2015, 04:25

Is there any other methods to initialize turbulence field for DNS channel flow case, besides PerturbU?

I have tried perturbU, but the results are not satisfied. The "Streaks" did not evolve into turbulence, and they died out.
It seems parameters of perturbU are too hard to tune...

So, except this way I have to try something else...
Could anybody give me some suggestions? Thank you

songwukong · May 17, 2015, 07:20

Oh, I got it :）
My experience that perturbU did not work well was due to the choice of SGS model.
The oneEqEddy SGS model does not make perturbU work well, as I tried many days before, but the lowReEqEddy does!

sadsid · November 12, 2020, 10:56

Quote:

Originally Posted by songwukong

Oh, I got it :）
My experience that perturbU did not work well was due to the choice of SGS model.
The oneEqEddy SGS model does not make perturbU work well, as I tried many days before, but the lowReEqEddy does!

Have you set up the case for channel flow with PerturbU file?

May 15, 2015, 04:25	methods to initialize DNS turbulence field	#1
songwukong New Member Song Join Date: Nov 2011 Posts: 12 Rep Power: 14	Is there any other methods to initialize turbulence field for DNS channel flow case, besides PerturbU? I have tried perturbU, but the results are not satisfied. The "Streaks" did not evolve into turbulence, and they died out. It seems parameters of perturbU are too hard to tune... So, except this way I have to try something else... Could anybody give me some suggestions? Thank you

May 17, 2015, 07:20		#2
songwukong New Member Song Join Date: Nov 2011 Posts: 12 Rep Power: 14	Oh, I got it :） My experience that perturbU did not work well was due to the choice of SGS model. The oneEqEddy SGS model does not make perturbU work well, as I tried many days before, but the lowReEqEddy does! Aaron_L likes this.

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