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

Dissipative scheme

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 20, 2005, 10:15
Default Dissipative scheme
  #1
P.Cooke
Guest
 
Posts: n/a
hello all. i am a little confused and wondered if someone can point me in the right direction.

1) firstly, is the following statement true.... image a turbulent jet flow. if we over predict the dissipation of turbulent kinetic energy, then there will be less enegy and motion in the eddies to mix the jet. therefore if we DO over predict the dissipation of turbulent kinetic energy the modelled jet will mix and spread less. are these statements true???

2) secondly, based on the first points, if in solving the navier stokes equations we use say an upwind scheme, i.e. a dissiaptive scheme, what effects does this have on the same jet simulation. i would have thought the dissipation would again damp fluctuations and therefore cause less mixing? but also the upwind scheme will 'smear' the solution on the mesh and therefore 'apparently show more mixing'. what are the effects of the upwind scheme on a spreading jet and how do these effects differ from the ones discussed in the first point i made.

any comments would be great as i am (as you may tell) a little confused.

  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
2nd order upwind scheme (Fluent and CFX) Far FLUENT 0 May 22, 2011 01:50
how to understand high resolution scheme and high order scheme iilw1314 Main CFD Forum 3 September 30, 2010 10:43
Implementation of QUICK scheme Romuald Skoda Main CFD Forum 10 August 3, 2010 12:23
AUSM scheme ? Central Scheme boling Main CFD Forum 5 September 9, 2009 19:06
extrapolation in MUSCL scheme Chandra Main CFD Forum 6 February 14, 2007 12:21


All times are GMT -4. The time now is 03:08.