CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums

Search Results

Register Blogs Community New Posts Updated Threads Search

Showing results 1 to 10 of 10
Search took 0.00 seconds. Search: Posts Made By: aylalisa
Forum: OpenFOAM Running, Solving & CFD October 28, 2014, 14:47
Replies: 21
Views: 3,928
Posted By aylalisa
Hi Xianbei, I don't understand. How can I...

Hi Xianbei,

I don't understand. How can I run a LES without an LES turbulence model:confused:

I hope anybody could support us here about the reason why defReff() is used for computation of the...
Forum: OpenFOAM Running, Solving & CFD October 28, 2014, 03:17
Replies: 21
Views: 3,928
Posted By aylalisa
Hi Xianbei, to figure out R_{eff} for LES: ...

Hi Xianbei,

to figure out R_{eff} for LES:
I've choosen one of the turbulence models, for example oneEqEddy.C.
Check the source code, line 65 --> Function call GenEddyVisc...
Forum: OpenFOAM Running, Solving & CFD October 27, 2014, 13:55
Replies: 21
Views: 3,928
Posted By aylalisa
Hi huangxianbei, I've computed \tau_{wall}...

Hi huangxianbei,

I've computed \tau_{wall} and u_\tau by the different ways.

u_\tau= sqrt(\nu_{eff} * snGrad(U))
u_\tau = sqrt(mag((-Sfp/magSfp) & B_{eff}))
\rho is not needed.

I get...
Forum: OpenFOAM Running, Solving & CFD October 24, 2014, 07:44
Replies: 21
Views: 3,928
Posted By aylalisa
I started from this thread too but I am still...

I started from this thread too but I am still looking for the reason why the result does not agree with \tau = \rho * \nu * gradU :-(
Forum: OpenFOAM Running, Solving & CFD October 24, 2014, 04:56
Replies: 21
Views: 3,928
Posted By aylalisa
Hi Xianbei, sorry that I ask again but I'd...

Hi Xianbei,

sorry that I ask again but I'd like to be sure to understand you correctly.

You compute \tau_{wall} = \rho * \nu * gradU and this result matches the experimentally received...
Forum: OpenFOAM Running, Solving & CFD October 21, 2014, 12:21
Replies: 21
Views: 3,928
Posted By aylalisa
Dear huangxianbei, thank's for your hint...

Dear huangxianbei,

thank's for your hint according to the turbulence model!

My function for computing u_\tau, using \tau_{wall} according to unit_wallnormal &Beff ,does not work either.
...
Forum: OpenFOAM Running, Solving & CFD October 12, 2014, 14:01
Replies: 21
Views: 3,928
Posted By aylalisa
Hi Florian, I was busy at work and...

Hi Florian,

I was busy at work and completely lag my ToDo list. Tomorrow I can start simulation. It will take some time because I still work on a stand-alone work station. If u_tau is the problem...
Forum: OpenFOAM Running, Solving & CFD October 8, 2014, 07:09
Replies: 21
Views: 3,928
Posted By aylalisa
Hi Florian, uTau: I will check and see how...

Hi Florian,

uTau:
I will check and see how curves change!

Grid-resolution:
Especially the fact, that the coarser grid of both simulations gives seemingly the better result, is astonishing....
Forum: OpenFOAM Running, Solving & CFD October 7, 2014, 11:02
Replies: 21
Views: 3,928
Posted By aylalisa
Hi Florian, thanks for your answer, sorry...

Hi Florian,

thanks for your answer, sorry for late reply!

uTau:

uTau.boundaryField()[patchi] =
sqrt
(
...
Forum: OpenFOAM Running, Solving & CFD September 30, 2014, 11:46
Replies: 21
Views: 3,928
Posted By aylalisa
LES: dynSmagorinsky does not match analytical y+/u+ profile

Dear Foamers,

I've simulated an LES canal flow and used dynamicSmagorinsky (by Alberto Pasquale) with vanDriest damping function.

The dimensionless profiles y+/u+ don't match the analytical...
Showing results 1 to 10 of 10

 
Forum Jump

All times are GMT -4. The time now is 00:35.

Contact Us - CFD Online - Privacy Statement - Top