CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

LES of turbulent channel flow (overprediction)

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 19, 2017, 12:33
Default LES of turbulent channel flow (overprediction)
New Member
Nathan Ricks
Join Date: Aug 2015
Posts: 10
Rep Power: 9
nathanricks is on a distinguished road

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,
nathanricks is offline   Reply With Quote


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 07:40
Turbulent transition in channel flow yansheng STAR-CCM+ 11 June 16, 2016 10:05
Calculate statistics of Turbulent channel flow with LES sjwon1991 Main CFD Forum 2 May 11, 2016 00:31
references for how to maintain a constant flow rate in turbulent channel flow amirrstg Main CFD Forum 0 October 25, 2011 04:17
Initial conditionfor turbulent channel flow in LES pankaj saha Main CFD Forum 0 November 30, 2007 13:04

All times are GMT -4. The time now is 23:28.