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

LES of turbulent channel flow (overprediction)

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 19, 2017, 11:33
Default LES of turbulent channel flow (overprediction)
  #1
New Member
 
Nathan Ricks
Join Date: Aug 2015
Posts: 10
Rep Power: 10
nathanricks is on a distinguished road
Hello,

I'm trying to simulate the classical case of turbulent channel flow at Re = 180 with Ansys Fluent 15.0, using LES (with dynamic smag SGS model, and an in-house SGS model).

The simulation is running, and seems to give trends as expected, however we are seeing an overprediction in the mean streamwise (x) velocity - ~21m/s compared to ~18m/s in the literature.

Does anyone have any experience with this particular case in Fluent, and can give me some hints/point me towards a tutorial, etc?

Some of the major setup points include:

- Periodicity in the x (streamwise) and z (cross-stream), with walls in the +/- y direction

The periodicity was defined in fluent, using modify zone. The pressure gradient is defined as -1 (from dP/dx = density*(u_fric)^2), with flow direction = [1,0,0] - this is one of our concerns, is this correct for Fluent?

- CFL and wall y+ < 0.5
- Grid and domain defined consistent with literature
- Flow initialised using k-epsilon RANS, and then init-instantaneous-vel

If any more details would be helpful I'd be happy to give. Any help would be much appreciated!

Thank you in advance,
Nathan.
nathanricks is offline   Reply With Quote

Old   March 3, 2024, 21:47
Default turbulent plane channel flow
  #2
New Member
 
Song Shanshan
Join Date: Mar 2024
Posts: 1
Rep Power: 0
songsshan is on a distinguished road
Hi, sorry to bother you, but has your problem been solved? I've just recently started dealing with this issue and am not sure how to work about it?Could you give some help?
songsshan is offline   Reply With Quote

Reply

Tags
channel flow, fluent, les, periodic bc, pressure gradient

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Issues on the simulation of high-speed compressible flow within turbomachinery dowlee OpenFOAM Running, Solving & CFD 11 August 6, 2021 06:40
Turbulent transition in channel flow yansheng STAR-CCM+ 11 June 16, 2016 09:05
Calculate statistics of Turbulent channel flow with LES sjwon1991 Main CFD Forum 2 May 10, 2016 23:31
references for how to maintain a constant flow rate in turbulent channel flow amirrstg Main CFD Forum 0 October 25, 2011 03:17
Initial conditionfor turbulent channel flow in LES pankaj saha Main CFD Forum 0 November 30, 2007 12:04


All times are GMT -4. The time now is 21:54.