LAPACK in openFOAM

Alish1984 · July 27, 2011, 17:17

Hi everyone

does anyone know how to use lapack++ and BLAS libraries in openfoam?

l_r_mcglashan · July 27, 2011, 18:40

Yes.

It can be as simple (in the case of uBLAS) as including the relevant header files in your source code and compiling.

Alish1984 · July 28, 2011, 11:29

Quote:

Originally Posted by l_r_mcglashan

Yes.

It can be as simple (in the case of uBLAS) as including the relevant header files in your source code and compiling.

whats uBLAS?
as I know,LAPACK needs BLAS and both of them are compiled seperately and make their own libraries.and i dont know how to use these libraries.

JimKnopf · August 11, 2011, 09:56

It is as simple als you have to compile the LaPack++ library on your Workstation and than include the headerfiles like

Code:

#include "lafnames.h"

but take care to include the library in Make/options. There you need to define a -I/path/to/your/lapack++library.so

greets
Jim

lakeat · September 5, 2011, 15:55

Hi,

Sorry, my question might be stupid, but why do you want to use Lapack? (LAPACK — Linear Algebra PACKage), is it because the funtion you need OpenFOAM currently does not have it, or is it not as efficient as Lapack is?

Thanks

JimKnopf · September 6, 2011, 01:52

Quote:

Originally Posted by lakeat

Hi,

Sorry, my question might be stupid, but why do you want to use Lapack? (LAPACK — Linear Algebra PACKage), is it because the funtion you need OpenFOAM currently does not have it, or is it not as efficient as Lapack is?

Thanks

Probably he needs the eigenvalue functions or the QR-Factorization in LAPACK. But there might be tons of other reasons

Greets Jim

Alish1984 · September 7, 2011, 06:26

Quote:

Originally Posted by lakeat

Hi,

Sorry, my question might be stupid, but why do you want to use Lapack? (LAPACK — Linear Algebra PACKage), is it because the funtion you need OpenFOAM currently does not have it, or is it not as efficient as Lapack is?

Thanks

As Jim said I wanted to use some of its functions like SVD(Singular value decomposition), Cholesky decomposition, QR decomposition... that openFOAM doesnt have
I forgot about Lapack and used "NumericalRecipies in C++" algorithms for my work

l_r_mcglashan · September 7, 2011, 06:33

There is an implementation of SVD in OF, so you can save yourself the trouble with that one at least.

Alish1984 · September 7, 2011, 07:23

Quote:

Originally Posted by l_r_mcglashan

There is an implementation of SVD in OF, so you can save yourself the trouble with that one at least.

Yeah I saw SVD in OF2.0

lakeat · September 7, 2011, 10:41

Oh, I see.

Have you compared the code, Numerical Receipt good or Lapack++'s good? Or they are same for your case?

lakeat · September 7, 2011, 10:42

Im looking for solving the eigenvalue and eigenvector, I am not sure OF has it or not? Anyone in the know?

brosemu · February 10, 2012, 13:40

If anyone is still having trouble using LAPACK functions in OpenFOAM, I have put together a quick example application that demonstrates how to do it. I sure don't understand all of the intricacies, but it works! Send me a message with your e-mail address and I'll be sure to get it off to you.

mufeng · March 21, 2022, 22:45

Quote:

Originally Posted by brosemu

If anyone is still having trouble using LAPACK functions in OpenFOAM, I have put together a quick example application that demonstrates how to do it. I sure don't understand all of the intricacies, but it works! Send me a message with your e-mail address and I'll be sure to get it off to you.

Dear brosemu, I also have trouble using LAPACK functions in OpenFOAM. would you like to share a quick example application on how to do it? my e-mail address is 1564480576@qq.com. Thanks a lot.

July 27, 2011, 17:17	LAPACK in openFOAM	#1
Alish1984 Member Ali Shamooni Join Date: Oct 2010 Posts: 44 Rep Power: 15	Hi everyone does anyone know how to use lapack++ and BLAS libraries in openfoam?

July 27, 2011, 18:40		#2
l_r_mcglashan Senior Member Laurence R. McGlashan Join Date: Mar 2009 Posts: 370 Rep Power: 23	Yes. It can be as simple (in the case of uBLAS) as including the relevant header files in your source code and compiling. __________________ Laurence R. McGlashan :: Website

August 11, 2011, 09:56		#4
JimKnopf Member Jim Knopf Join Date: Dec 2010 Posts: 60 Rep Power: 15	It is as simple als you have to compile the LaPack++ library on your Workstation and than include the headerfiles like Code: #include "lafnames.h" but take care to include the library in Make/options. There you need to define a -I/path/to/your/lapack++library.so greets Jim

September 5, 2011, 15:55		#5
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	Hi, Sorry, my question might be stupid, but why do you want to use Lapack? (LAPACK — Linear Algebra PACKage), is it because the funtion you need OpenFOAM currently does not have it, or is it not as efficient as Lapack is? Thanks __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

September 7, 2011, 06:33		#8
l_r_mcglashan Senior Member Laurence R. McGlashan Join Date: Mar 2009 Posts: 370 Rep Power: 23	There is an implementation of SVD in OF, so you can save yourself the trouble with that one at least. __________________ Laurence R. McGlashan :: Website

September 7, 2011, 10:41		#10
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	Oh, I see. Have you compared the code, Numerical Receipt good or Lapack++'s good? Or they are same for your case? __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

September 7, 2011, 10:42		#11
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	Im looking for solving the eigenvalue and eigenvector, I am not sure OF has it or not? Anyone in the know? __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

February 10, 2012, 13:40		#12
brosemu New Member Bill Rosemurgy Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 20 Rep Power: 17	If anyone is still having trouble using LAPACK functions in OpenFOAM, I have put together a quick example application that demonstrates how to do it. I sure don't understand all of the intricacies, but it works! Send me a message with your e-mail address and I'll be sure to get it off to you. solefire, jiec827 and hua1015 like this.

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