CFD Online URL
[Sponsors]
Home > Forums > OpenFOAM Pre-Processing

Driver region for LES

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   June 3, 2009, 06:51
Default Driver region for LES
  #1
Senior Member
 
Prapanch Nair
Join Date: Mar 2009
Location: Bangalore, India
Posts: 105
Rep Power: 7
prapanj is on a distinguished road
Hi,

I would like to run a LES case(external flow) with a turbulence upstream. In order to create turbulence upstream, I thought I will build a driver region. that has the same cross section as my domain and same number of cell faces as my domains inlet. In this driver region I think of using standard K epsilon. The idea is to have a uniform flow at the inlet and then map the outlet to the inlet so as to make it a periodic(cyclic) flow. How can I do this?
Will the initial boundary condition at the inlet remain, not letting my cyclic condition influence it?

thank you
Prapanj
prapanj is offline   Reply With Quote

Old   June 30, 2009, 14:28
Default
  #2
Senior Member
 
Cedric DUPRAT
Join Date: Mar 2009
Location: Belgium
Posts: 169
Rep Power: 7
cedric_duprat is on a distinguished road
Quote:
Originally Posted by prapanj View Post
Hi,

I would like to run a LES case(external flow) with a turbulence upstream. In order to create turbulence upstream, I thought I will build a driver region. that has the same cross section as my domain and same number of cell faces as my domains inlet. In this driver region I think of using standard K epsilon. The idea is to have a uniform flow at the inlet and then map the outlet to the inlet so as to make it a periodic(cyclic) flow. How can I do this?
Will the initial boundary condition at the inlet remain, not letting my cyclic condition influence it?

thank you
Prapanj
Hi Prapanj

Maybe you can first have a look on the boundary condition called directMappedPatch
check in the forum you'll find tutorial and details on this BC.

Then, if you want to simulate a LES case, running a cyclic RANS geometry is not enough (of course). You will have to add specific noise, fluctuations at your average parameter.
Otherwise, you can run a previous cyclic LES calculation there, there is no need to add fluctuations but you can get problem to match your mean flow.
Well in fact, the methods depend of your case.

I hope it will help

Cedric
cedric_duprat is offline   Reply With Quote

Reply

Tags
cyclic, driver, les, periodic

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
reconstructpar -region borrbyper OpenFOAM Bugs 2 April 23, 2009 14:52
Gambit HEX core method gives unwanted 2D region KK FLUENT 1 February 4, 2008 10:31
Rotating region of a centr. pump - Counter R wall Emre CFX 0 September 20, 2007 10:58
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 05:15
Import gmsh msh to Foam adorean Open Source Meshers: Gmsh, Netgen, CGNS, ... 24 April 27, 2005 09:19


All times are GMT -4. The time now is 20:55.