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

Introduce a perturbation during a simulation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 25, 2013, 21:07
Default Introduce a perturbation during a simulation
  #1
Member
 
Bart A.
Join Date: Feb 2012
Posts: 45
Rep Power: 5
ziggo is on a distinguished road
In this article on unsteady CFD analysis of von Karman vortex shedding the following is said on page 3, section 2.3:

Quote:
When the steady state solution is achieved within about 80 time steps, a jet normal to the mean flow direction is introduced in the vicinity of the trailing edge during 10 time steps.
This is done to accelerate the occurrence of the vortex shedding.
How do I introduce a local jet normal to the flow in Fluent for a certain amount of time steps?
ziggo is offline   Reply With Quote

Old   November 26, 2013, 13:14
Default
  #2
Senior Member
 
François Grégoire
Join Date: Jan 2010
Location: Laval University, Canada
Posts: 366
Rep Power: 8
macfly is on a distinguished road
Implement a DEFINE_PROFILE udf where the inlet velocity profile is dependent on the flow time with some conditional statements.

For an example of DEFINE_PROFILE and flow time, look for "UDF for specifying a transient pressure profile boundary condition" in the Ansys Fluent UDF Manual. Then look for "if-esle statement" in the same manual.
macfly is offline   Reply With Quote

Reply

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
Solar Radiation in OpenFOAM plainstyle OpenFOAM Running, Solving & CFD 15 July 8, 2014 04:43
Simulation of a complex wing in solidworks flow simulation niels1900 FloEFD, FloWorks & FloTHERM 6 April 20, 2011 10:44
Use mesh motion to introduce angle for static simulation dancfd OpenFOAM Running, Solving & CFD 1 November 18, 2010 20:15
GUI crash and simulation engine still running RPJones FLOW-3D 2 November 9, 2010 09:18
strange simulation error Ralf Schmidt FLUENT 2 May 4, 2007 13:02


All times are GMT -4. The time now is 03:18.