CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

How to implement the zonal (or layering) RANS and LES method

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 1, 2012, 06:43
Default How to implement the zonal (or layering) RANS and LES method
  #1
Member
 
Kim Yusik
Join Date: Dec 2009
Posts: 39
Rep Power: 16
impecca is on a distinguished road
Dear foamers

I am trying to implement a wall model which is known as zonal (or layering or two-layer) RANS and LES method. Papers related to this model are below

1. Wang and Moin, Dynamic wall modeling for large-eddy simulation of complex turbulent flows, Physics of Fluids, 2002

2. L. Temmerman, M. Hadžiabdic, M.A. Leschziner, K. Hanjalic, A hybrid two-layer URANS–LES approach for large eddy simulation at high Reynolds numbers, International Journal of Heat and Fluid Flow, Volume 26, Issue 2, April 2005, Pages 173-190,

In these models, simplified RANS equations need to be solved in the 'inner' or 'embedded' mesh which is different from global mesh for LES (global mesh means that the mesh which is saved in /constant/polyMesh/ folder). So I am wondering is there any way to deal with two different mesh and equations at the same simulation with its overlap area (the inner mesh overlaps on the global mesh) in OpenFoam? I really don't know where to start. if there is any prototype case or any other approach to cope with this issue that you know, please let me know. and any other advice will be very grateful.
Regards

Yusik
impecca is offline   Reply With Quote

Old   December 10, 2012, 22:52
Default
  #2
New Member
 
zhanghaitao
Join Date: Apr 2012
Location: Shanghai
Posts: 1
Rep Power: 0
zht_shanghai is on a distinguished road
Hi, Yusik.
I have exactly the same questions with you. So did your problems finally get solved? or you have other advice? Any reply will be appreciated, thanks.
zht_shanghai is offline   Reply With Quote

Old   January 15, 2013, 11:05
Default
  #3
Senior Member
 
Albrecht vBoetticher
Join Date: Aug 2010
Location: Zürich, Swizerland
Posts: 240
Rep Power: 17
vonboett is on a distinguished road
Maybe of interest: Keylock et. al used that approach to model rivers and streams and they provide some suggestions for the grid resolution and several values for parameters used for the Reynolds averaged wall layer simulation, and of course all the equations:

Keylock et. al (2012) "The application of computational fluid dynamics to natural river channels:
Eddy resolving versus mean flow approaches" in Geomorphology 179 (2012) 1–20

I still work with wall functions or even just vanDriest Damping but I would be happy if someone gets further than that in OF.
vonboett is offline   Reply With Quote

Old   March 10, 2017, 13:34
Default
  #4
New Member
 
Arpan Sircar
Join Date: Mar 2017
Posts: 8
Rep Power: 9
ArpanS is on a distinguished road
Hello everyone

I am trying to implement a similar methodology into OpenFoam. Specifically I am working on implementing non-equilibrium models in a refined embedded mesh close to the walls of IC engines to solve for wall heat transfer. Any pointers on how to get started with embedding such a mesh into the existing mesh, solving additional PDEs on the embedded mesh and passing information between the two meshes would be of great help.

Thanks
Arpan
ArpanS is offline   Reply With Quote

Old   May 16, 2017, 23:52
Default
  #5
Senior Member
 
Huang Xianbei
Join Date: Sep 2013
Location: Yangzhou,China
Posts: 302
Rep Power: 14
huangxianbei is on a distinguished road
To the best of my knowledge, the hybrid method contains both hard interface and soft interface between LES and RANS. Therefore, you may not need to split the mesh into 2 parts. Setting a appropriate y+ should be more convinient. While, the problem remains to solve the interface which couples the 2 methods. That's to say, the RANS field should increase fluctuation and LES should damping towards the interface. I'm interested in this topic, if you have any further research, I'm glad to communicate with you.
huangxianbei is offline   Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Transition RANS to LES during simulation LorenzN OpenFOAM Running, Solving & CFD 4 November 17, 2011 11:47
Mapping RANS data onto an LES christian OpenFOAM Running, Solving & CFD 0 April 13, 2007 06:31
someone to answer..Difference between LES and RANS Nik Main CFD Forum 2 September 4, 2005 12:40
RANS results for LES Li Yang Main CFD Forum 5 June 17, 2002 06:34
use of common RANS B.C.'s in LES? Sanjin Saric Main CFD Forum 0 March 21, 2002 07:08


All times are GMT -4. The time now is 03:25.