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

Shear stress fluctuations by turbulent flow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 11, 2012, 06:54
Default Shear stress fluctuations by turbulent flow
  #1
New Member
 
Liangli
Join Date: Oct 2012
Posts: 2
Rep Power: 0
Meegao is on a distinguished road
Dear all:

I am trying to plot the shear force as a function of flow time on & near a flat plate at a fixed point. The flow in contact with the plate surface is turbulence therefore I am expecting random time history because the flow velocity of a turbulent flow should be random. However my CFD result shows a quite smooth sin wave.

Its a 2D simulation, I used k-e model, standard wall treatment, no slip, Re=3.6e6, Simplec method and second order for every option. sufficiently small time step, the mesh is ok and I got reasonably good Cl and Cd results in the steady case. For the unsteady simulation I have two monitor points one on the plate and one slightly above. The point-velocity time history for both points follow the same trend (sin wave) with only a little differences in magnitude.

I was hoping to see some randomness and I have been stuck for days. any input on this matter from you guys is much appreciated!
Meegao is offline   Reply With Quote

Reply

Tags
shear stress, turbulence modeling

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
Problem with divergence TDK FLUENT 13 December 14, 2018 07:00
Transitional Flow Shear Stress Transport (SST) k-omega Turbulence Model josechen FLUENT 0 July 20, 2011 17:06
Laminar flow or Turbulent flow mech FLUENT 0 January 27, 2007 19:51
laminar and turbulent flow in one simulation msna FLUENT 0 January 27, 2007 18:35
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 22:31


All times are GMT -4. The time now is 20:49.