I am working on a 2-d and 3-d cfd code and use an iteration method to get solutions. Now, I like to solve the problems using a matrix solver. If any body have a free matrix solver or have information of free matrix solver, please contact me.

The properties of your systems will determine the solver that you need. For general problems:

http://www.osl.iu.edu/research/itl/

Thank you very much, al. In fact, I am looking for a matrix solver written in FORTRAN. Any way, thank you for your quick response.

Try f77 SPARSKIT package by J.Saad. I successfully use it.

http://www-users.cs.umn.edu/~saad/software/home.html

Alexey.

Thanks Alexey. I found the website you suggested is interesting. It may take me a wihle to read the documents. I will go back to you if I need some thing more in detail.

ya, i just tried it too. u can also try another similar package called NSPCG.