|
[Sponsors] |
LES database for turbulent channel flow at Re_tau=590 |
![]() |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
![]() |
![]() |
#1 |
Senior Member
|
Dear all,
with this post i want to promote the availability of large eddy simulation (LES) data for the turbulent channel flow at Re_tau = 590, following the well known DNS database of Moser, Kim and Mansour. The database, which is available at: http://www.cfdlab.polimi.it/Research/LESinItaly.tar.gz has been produced within the LESinItaly initiative, an Italian collaborative framework on LES. Different research groups produced the results with different codes, in particular: - In house staggered 2nd order Finite Difference - In house cell-centered 2nd order Finite Volume - In house hybrid 4th order/pseudo-spectral solver - Open-Source FV codes Code_Saturne and OpenFOAM - Commercial FV codes Fluent and TransAT Each group has provided results with its own SGS model(s) and a no model computation on two separate grids (differing in the wall-normal resolution). You can find additional information in the README files accompanying the database. Regards |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
cfdnewbie
Join Date: Mar 2010
Posts: 557
Rep Power: 20 ![]() |
Great, we have some computations of that channel as well, thank you for the link and for compiling the data. One question: Can the results be cited (for comparison?) and if yes, how ? Would you have a bibtex for example?
Thanks again! |
|
![]() |
![]() |
![]() |
![]() |
#3 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,830
Rep Power: 73 ![]() ![]() ![]() |
the README file should contain the infos ...
|
|
![]() |
![]() |
![]() |
![]() |
#4 |
Senior Member
cfdnewbie
Join Date: Mar 2010
Posts: 557
Rep Power: 20 ![]() |
Allright, thanks a lot!
|
|
![]() |
![]() |
![]() |
![]() |
#5 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,830
Rep Power: 73 ![]() ![]() ![]() |
we are currently revising the full paper submitted on Meccanica
|
|
![]() |
![]() |
![]() |
![]() |
#6 |
Senior Member
|
I just want to add that, if this post gets lost, you can find again the link to the database in my blog page (in few days actually, as it is not updated yet):
http://www.cfd-online.com/Forums/blogs/sbaffini/ |
|
![]() |
![]() |
![]() |
![]() |
#7 | |
Senior Member
Huang Xianbei
Join Date: Sep 2013
Location: Yangzhou,China
Posts: 302
Rep Power: 14 ![]() |
Quote:
![]() |
||
![]() |
![]() |
![]() |
![]() |
#8 |
Senior Member
|
Hi Huang,
yes, that's the Reynolds according to the DNS. However, as all the codes run with a fixed pressure gradient, the resulting bulk Re numbers for this database will vary from code to code and case to case. Still, they are generally close to this value. This activity started back in 2009 and has nothing to do with Nek5000, which i started using the last summer. However, according to the user file of the example (http://trac.mcs.anl.gov/projects/nek...urbChannel.usr) it is the same flow, but computed with a fixed mass flow rate. |
|
![]() |
![]() |
![]() |
![]() |
#9 | |
Senior Member
Huang Xianbei
Join Date: Sep 2013
Location: Yangzhou,China
Posts: 302
Rep Power: 14 ![]() |
Quote:
|
||
![]() |
![]() |
![]() |
![]() |
#10 |
Senior Member
|
Well, this is (in my opinion) an interesting question indeed. Apparently, this topic has been addressed "privately" in all the labs working on DNS and only recently some details on the topic are coming out in the papers. The universal answer to the question is that it doesn't matter, the results are exactly the same if you fix the pressure gradient or the mass flow rate (corresponding to the same pressure gradient).
While i had the exact same answer from some tests, i admit that i am still not very happy on this matter. One can think of the fixed mass flow case as a fixed pressure gradient case with a super-imposed, null on average, fluctuating forcing. Having the same results means that such fluctuating component has no direct effect on the mean flow. This might depend from the scale separation between the input (the fluctuating forcing is still constant in space) and the output (the fluctuating forcing balances the local fluctuations on the wall shear stress to keep the mass flow constant), which is very large. But, as the flow governing equations are not the same, i don't expect the effect to be exactly null for all the statistics. |
|
![]() |
![]() |
![]() |
![]() |
#11 | |
Senior Member
Huang Xianbei
Join Date: Sep 2013
Location: Yangzhou,China
Posts: 302
Rep Power: 14 ![]() |
Quote:
|
||
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
LES of turbulent channel flows | cedric_duprat | OpenFOAM Running, Solving & CFD | 220 | November 18, 2019 04:19 |
Velocity curve in channel flow by pisoFoam and LES | mxylondon | OpenFOAM Verification & Validation | 9 | June 21, 2015 07:28 |
setup problems - LES pipe flow with cyclic BC (1) and direct mapped inlet (2) | florian_krause | OpenFOAM | 22 | June 13, 2013 21:25 |
Fluent LES Channel Flow | santosh | FLUENT | 0 | January 7, 2010 21:11 |
Signal decay in les channel flow | pankaj saha | Main CFD Forum | 0 | July 25, 2008 12:34 |