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

conservative and non conservative

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 15, 2006, 11:25
Default conservative and non conservative
  #1
jj
Guest
 
Posts: n/a
dear sir, can we say eulerian approach is conservative form and lagrnagian approach as non conservative form?
  Reply With Quote

Old   August 15, 2006, 14:07
Default Re: conservative and non conservative
  #2
ag
Guest
 
Posts: n/a
No - an Eulerian approach can be non-conservative or conservative. A conservative approach involves casting the flux terms as a divergence of a flux function.
  Reply With Quote

Old   August 16, 2006, 00:50
Default Re: conservative and non conservative
  #3
Deepak
Guest
 
Posts: n/a
ya any approach can be converted into conservative or non conservative forms..we can do this using mathematical formulations like using advection terms.but can anybody explain the physics going behind that? like how by just changing into divergence form,u can assure conservative?

Thanks in advance,

Deepak
  Reply With Quote

Old   August 16, 2006, 07:51
Default Re: conservative and non conservative
  #4
ag
Guest
 
Posts: n/a
The differential equations that we normally solve are actually derived from integral equations that hold globally. When they are reduced to differential form then the equations hold locally and we need extra conditions to ensure global conservation. The divergence form is one form that can be directly related to the integral form of the equations via Gauss' Divergence theorem. It thus possesses better conservation properties than a non-conservative scheme (for example the ability to capture shocks without the explicit application of the Rankine-Hugoniot condition). At least, that's how I learned it. More information could be found in the Wiki article, as well as googling for conservation form+CFD. Most textbooks also include some information on this.
  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



All times are GMT -4. The time now is 08:36.