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

Finite Difference - Nonuniform mesh

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 28, 2009, 08:56
Default Finite Difference - Nonuniform mesh
  #1
New Member
 
Join Date: Apr 2009
Posts: 1
Rep Power: 0
Excom is on a distinguished road
Hi

I am trying to solve Poissons equation with the use of the finite difference method.

Is there any one that can tell me how the second order derivative lookes like in the interface between a fine and a rough mesh?

I know that this has nothing to do with fluid dynamics, but maybe some one is familiar the finite difference method and is able to help me.

Thanks in advance
Excom is offline   Reply With Quote

Old   April 28, 2009, 10:21
Default
  #2
Senior Member
 
N/A
Join Date: Mar 2009
Posts: 189
Rep Power: 17
harishg is on a distinguished road
You can get the finite difference formula for non uniform mesh by writing the derivative as
f_primeprime = a f_i-1+ b f_i + c f_i-1
Expand the RHS using Taylor's series and match the coefficients on both sides to get a,b anc c.
harishg is offline   Reply With Quote

Old   May 11, 2009, 19:08
Default finite difference approximation to 2nd derivative
  #3
New Member
 
Join Date: Apr 2009
Posts: 6
Rep Power: 17
CFDstudent is on a distinguished road
did this answer your question?
CFDstudent is offline   Reply With Quote

Reply

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
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 19:10
Does a 2D finite volume triangular mesh diaw Main CFD Forum 3 June 15, 2005 04:00
Finite Volume Vs Finite Difference Mukkarum Main CFD Forum 3 February 8, 2003 12:16
Compact finite difference schemes Tom Clay Main CFD Forum 4 November 28, 2002 09:59
Mesh Mignard FLUENT 2 March 22, 2000 06:12


All times are GMT -4. The time now is 10:22.