CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Programming & Development

ldu matrix, ldu addressing

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

LinkBack Thread Tools Search this Thread Display Modes
Old   December 7, 2013, 12:40
Default ldu matrix, ldu addressing
Senior Member
Join Date: Jan 2012
Posts: 166
Rep Power: 14
maybee is on a distinguished road

within method

surfaceSum (const GeometricField<Type, fvsPatchField, surfaceMesh>& ssf)
is found

163* const labelUList& owner = mesh.owner();
where method owner() is

const labelUList& owner() const  //Internal face owner.
return lduAddr().lowerAddr(); //Return ldu addressing. //Return lower addressing.
My questions are about the ldu matrice of fvmesh. Questions:
1. I have read the article:

In chapter 2.2 it is written that a 9 cell mesh has 91 matrice coefficients. This means nine coefficients per cell. Is it that the coefficients are 8 for the surface centers and 1 for the cell center? (I am just guessing here )

2.Am I right, that with method owner first the ldu matrix of fvmesh mesh is returned with lduAddr() and afterwards the lower triangle of this matrice is returned with lowerAddr()?
Furthermore, does ldu addressing just mean that we select different parts of the ldu matrice by this methods?

3. When calling owner() on fvmesh mesh what are the coefficients saved in the fvmesh mesh matrice, to be more precise what physical dimension do the coefficients represent?

maybee is offline   Reply With Quote


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
more equation in block matrix system yhaomin2007 OpenFOAM 1 September 6, 2012 08:33
Force can not converge colopolo CFX 13 October 4, 2011 22:03
How to find the product of A+ matrix and A- matrix arjun shanker Main CFD Forum 0 November 12, 2010 22:12
OpenFOAM version 1.6 details lakeat OpenFOAM Running, Solving & CFD 42 August 26, 2009 21:47
Addressing matrix element and reuse of system matrix marziolettich OpenFOAM Running, Solving & CFD 2 February 19, 2008 05:04

All times are GMT -4. The time now is 01:46.