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

Gas flow in vortex tube - LES and grid resolution

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 26, 2009, 03:43
Default Gas flow in vortex tube - LES and grid resolution
  #1
Member
 
Bernard Esterhuyse
Join Date: Mar 2009
Location: Pretoria, South Africa
Posts: 50
Rep Power: 17
bernarde is on a distinguished road
Hi all

We are currently working on a project where we have gas flowing in a vortex tube. The gas is flowing at high velocity (and high Mach number). From the work of JJ Derksen (Simulations of confined turbulent vortex flow, Comupters and Fluids 34 (2005)) I found they made use of LES with a Lattice Boltzmann method. However they the LB method is as yet now effective for high mach number compressible flows.

We are using Star-CCM+, and I have started a simulation with LES with the Smagorinsky SGS, but I am struggeling to reproduce the results obtained by Derksen. I am also unsure about the grid refinement required for LES.

I would like to find out anyone has effectivly simulated confined gas vortex flow (not using Lattice Boltzmann method).

Thanks in advance.

Bernard
bernarde is offline   Reply With Quote

Old   March 26, 2009, 11:50
Default
  #2
Senior Member
 
N/A
Join Date: Mar 2009
Posts: 189
Rep Power: 17
harishg is on a distinguished road
What kind of discretization scheme do you employ for the convection terms ? Make sure to keep it non dissipative to avoid numerical errors. My guess is your flow may have high velocity gradients. What is your geometry size and the meshing that you employ now ? Dynamic smagorinsky or LDKM might be a better option.
harishg is offline   Reply With Quote

Reply

Tags
lattice boltzmann method, les, vortex tube


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
LES -> DNS CFDtoy Main CFD Forum 6 February 24, 2009 06:23
Reynolds transport, turbulence model, etc Beginner Main CFD Forum 1 January 7, 2009 06:36
Initial conditionfor turbulent channel flow in LES pankaj saha Main CFD Forum 0 November 30, 2007 13:04
Grid size in LES Jin Li Main CFD Forum 1 May 19, 2000 11:02
ratio grid resolution (near wall/center) of dispersed bubbly flow columns using LES Ridwan Setiadi Arrizar Main CFD Forum 1 January 30, 1999 18:43


All times are GMT -4. The time now is 18:46.