How to extract Ax=B from solver for debugging

sontac · January 29, 2012, 01:04

I'm current viewing through the source code for icoFOAM. However I'm really interest in the actually matrix A and B in the Ax=B. I'm planning on tweaking the solver a litle and want to see the actual change on the A and B matrix for debugging purpose. I'm a little stuck as writing the A, the x, the B matrix out to a ascii file for analysis..

Any help is appreciated!!!

vatavuk · January 29, 2012, 07:15

Hi sontac,
You can find some information in this page of the wiki:
http://openfoamwiki.net/index.php/Op...x_coefficients

I hope it helps,
Paulo

elvis · January 30, 2012, 03:48

Hi,
maybe pythonflu is a valuable tool for you

see this post why it might help you
http://www.cfd-online.com/Forums/ope...tml#post302921

santiagomarquezd · January 30, 2012, 08:32

Hi Sontac, I think the perfect tool for you is gdbOF

http://openfoamwiki.net/index.php/Contrib_gdbOF

it is a tool attachable to gdb that helps you to extract FOAM data from memory in a transparent way, in your case you have to use the gdbOF tool

pfvmatrixfull

which dumps the matrix to a file

Enjoy it!

January 29, 2012, 01:04	How to extract Ax=B from solver for debugging	#1
sontac New Member Join Date: Jan 2012 Posts: 4 Rep Power: 14	I'm current viewing through the source code for icoFOAM. However I'm really interest in the actually matrix A and B in the Ax=B. I'm planning on tweaking the solver a litle and want to see the actual change on the A and B matrix for debugging purpose. I'm a little stuck as writing the A, the x, the B matrix out to a ascii file for analysis.. Any help is appreciated!!!

January 30, 2012, 08:32		#4
santiagomarquezd Senior Member Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 452 Rep Power: 23	Hi Sontac, I think the perfect tool for you is gdbOF http://openfoamwiki.net/index.php/Contrib_gdbOF it is a tool attachable to gdb that helps you to extract FOAM data from memory in a transparent way, in your case you have to use the gdbOF tool pfvmatrixfull which dumps the matrix to a file Enjoy it! __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar

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January 29, 2012, 07:15		#2
vatavuk Senior Member Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 17	Hi sontac, You can find some information in this page of the wiki: http://openfoamwiki.net/index.php/Op...x_coefficients I hope it helps, Paulo

January 30, 2012, 03:48		#3
elvis Senior Member Elvis Join Date: Mar 2009 Location: Sindelfingen, Germany Posts: 620 Blog Entries: 6 Rep Power: 24	Hi, maybe pythonflu is a valuable tool for you see this post why it might help you http://www.cfd-online.com/Forums/ope...tml#post302921