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

Time Accuracy of the NITA - FRACTIONAL STEP method

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 19, 2008, 06:37
Default Time Accuracy of the NITA - FRACTIONAL STEP method
  #1
Paolo Lampitella
Guest
 
Posts: n/a
Hello,

i'm trying to perform some accuracy tests of the NITA - FRACTIONAL STEP time integration scheme employed in Fluent using the Taylor Test Case, which is a double periodic array of vortex whose kinetic energy is decaying in time.

I performed several simulations with several grids, domains, boundary conditions, pressure interpolation schemes and space discretizations but i have misleading results.

Using exactly the same conditions cited in the paper

Sung-Eun Kim Boris Makarov

An Implicit Fractional-Step Method for Efficient Transient Simulation of Incompressible Flows

AIAA 2005-5253

  Reply With Quote

Old   March 19, 2008, 06:45
Default Re: Time Accuracy of the NITA - FRACTIONAL STEP me
  #2
Paolo Lampitella
Guest
 
Posts: n/a
Sorry, i pushed the wrong button.

Using the same conditions cited in the paper, i obtain the same results cited there, a 2nd order accurate in time scheme.

But, just going outside the conditions cited there, i always obtain only a first order time accurate scheme.

So i'd like to know if someone has experience in this or even know if there are some other papers where the scheme has been more rigorously tested and with which compare my results.

Thanks a lot, any help is appreciated
  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
Comparing between the Fractional step method and the SIMPLE method ghlee Main CFD Forum 1 April 10, 2012 16:59
Time accuracy of NITA - FRACTIONAL STEP in Fluent Paolo Lampitella Main CFD Forum 0 March 19, 2008 08:20
Question about fractional step method Harish Main CFD Forum 2 September 25, 2006 09:29
fractional step method Fuka Main CFD Forum 1 March 23, 2006 18:01
Fractional Step Method interpretation Jean-Fran├žois Corbett Main CFD Forum 2 March 1, 2006 11:38


All times are GMT -4. The time now is 18:57.