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Forum: OpenFOAM Running, Solving & CFD

October 11, 2014, 07:47

Replies: 21

LES: dynSmagorinsky does not match analytical y+/u+ profile

Views: 3,928

Posted By itchy

Hi Lisa, averaging time that the flow passes...

Hi Lisa,

averaging time that the flow passes 200 times the domain should be enough for a stable mean value. For the variances pherhaps not.

I mean some experimental data of channelflow?? Is...

Forum: OpenFOAM Running, Solving & CFD

October 8, 2014, 03:19

Replies: 21

LES: dynSmagorinsky does not match analytical y+/u+ profile

Views: 3,928

Posted By itchy

Hi Lisa, uTau: The inner variable is the...

Hi Lisa,

uTau:
The inner variable is the velocity (mean velocity). In your first approach you use U to calculate utau. And then you use utau to scale U. With this you get uncertainties in utau....

Forum: OpenFOAM Running, Solving & CFD

October 1, 2014, 09:31

Replies: 21

LES: dynSmagorinsky does not match analytical y+/u+ profile

Views: 3,928

Posted By itchy

Hi again, how do you calculate tau_w??? ...

Hi again,

how do you calculate tau_w???

Do not calculate tau_w with the velocity gradient near the wall, because you use a inner
variable that depends on your variable! If you do this, then...

Forum: OpenFOAM Running, Solving & CFD

October 1, 2014, 08:24

Replies: 21

LES: dynSmagorinsky does not match analytical y+/u+ profile

Views: 3,928

Posted By itchy

Hi, first: In dynamic Smagorinsky you use...

Hi,

first:
In dynamic Smagorinsky you use Germano procedure to estimate the Smagorinsky constant. With this you get the y³-law of the wall for nuSgs (that is what you want). If you use van Driest...

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