How to extract Differential Equations Matrix Coeff

srodrb · July 3, 2012, 08:13

Hello Foamers!

I'm pretty new in OpenFoam world, but not in CFD. I've spent 3-4 months working with OP so I have the generals although my field are mathematics, not aerodynamics.

I'm working on differential equations systems acceleration using hybrid methods (CPU-GPU) for my thesis.

My question is:

How can I get an output of OP with the coefficients matrix (the matrix which OpenFoam solves later)?

Thank you.

PD: - I will publish the results and the source under GNU license.
- Sorry about my english

stevenvanharen · July 6, 2012, 08:46

Did you look here?

src » finiteVolume » fvMatrices » fvMatrix

There are a lot of options for output I think.

srodrb · July 31, 2012, 07:22

Thanks for your help.

I'm still trying to find the way. This link helped me, so perhaps it could be useful for someone.

http://188.40.164.115/wordpress/?p=39#comment-44

santiagomarquezd · August 1, 2012, 16:27

Samuel, if you want to extract these values at debugging time and many other debug hacks you have gdbOF

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

Regards

srodrb · October 30, 2012, 04:14

Hello again!

I've been working with other stuff for some time so I've come back with OpenFOAM.

I've write out the matrix coefficients in a file for the cavity (2D) tutorial solved with icoFoam.

Note that coeff. [1][1] is on the left bottom

My question is, it is correct the addressing? Are there additional terms out of diagonals? (Wiki' figure is different from mine but I'm not sure if that would be extendible for 2D cases or only for 3D ones...

)

I'm reading some post of addressing... Thank you in advance.

shizuka · August 12, 2022, 10:59

I see it's an old post, all the links are not available after 10 years...

is there anyone happen to have some new links to this question? Thank you in advance.

dlahaye · August 12, 2022, 13:19

This link https://openfoamwiki.net/index.php/Contrib_gdbOF
still works. Let us know how it goes. Good luck.

shizuka · August 13, 2022, 05:51

Hi dlahaye, you are right, i overlooked this link on #4, thank you!

July 3, 2012, 08:13	How to extract Differential Equations Matrix Coeff	#1
srodrb New Member Samuel Rodriguez Bernabeu Join Date: Mar 2012 Location: Leon, Spain Posts: 3 Rep Power: 14	Hello Foamers! I'm pretty new in OpenFoam world, but not in CFD. I've spent 3-4 months working with OP so I have the generals although my field are mathematics, not aerodynamics. I'm working on differential equations systems acceleration using hybrid methods (CPU-GPU) for my thesis. My question is: How can I get an output of OP with the coefficients matrix (the matrix which OpenFoam solves later)? Thank you. PD: - I will publish the results and the source under GNU license. - Sorry about my english

October 30, 2012, 04:14	Coeff. Matrix. It's correct?	#5
srodrb New Member Samuel Rodriguez Bernabeu Join Date: Mar 2012 Location: Leon, Spain Posts: 3 Rep Power: 14	Hello again! I've been working with other stuff for some time so I've come back with OpenFOAM. I've write out the matrix coefficients in a file for the cavity (2D) tutorial solved with icoFoam. Note that coeff. [1][1] is on the left bottom My question is, it is correct the addressing? Are there additional terms out of diagonals? (Wiki' figure is different from mine but I'm not sure if that would be extendible for 2D cases or only for 3D ones... ) I'm reading some post of addressing... Thank you in advance.

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July 6, 2012, 08:46		#2
stevenvanharen Senior Member Steven van Haren Join Date: Aug 2010 Location: The Netherlands Posts: 149 Rep Power: 16	Did you look here? src » finiteVolume » fvMatrices » fvMatrix There are a lot of options for output I think.

July 31, 2012, 07:22		#3
srodrb New Member Samuel Rodriguez Bernabeu Join Date: Mar 2012 Location: Leon, Spain Posts: 3 Rep Power: 14	Thanks for your help. I'm still trying to find the way. This link helped me, so perhaps it could be useful for someone. http://188.40.164.115/wordpress/?p=39#comment-44

August 1, 2012, 16:27		#4
santiagomarquezd Senior Member Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 452 Rep Power: 24	Samuel, if you want to extract these values at debugging time and many other debug hacks you have gdbOF http://openfoamwiki.net/index.php/Contrib_gdbOF Regards __________________ 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

August 12, 2022, 10:59		#6
shizuka New Member Join Date: Aug 2022 Posts: 19 Rep Power: 4	I see it's an old post, all the links are not available after 10 years... is there anyone happen to have some new links to this question? Thank you in advance.

August 12, 2022, 13:19		#7
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 798 Blog Entries: 1 Rep Power: 17	This link https://openfoamwiki.net/index.php/Contrib_gdbOF still works. Let us know how it goes. Good luck.

August 13, 2022, 05:51		#8
shizuka New Member Join Date: Aug 2022 Posts: 19 Rep Power: 4	Hi dlahaye, you are right, i overlooked this link on #4, thank you!