i don't want to use commerical software . i want to know which language is most suit for cfd software program.thanks

Fortran90 is supposed to be robust language,if you are interested in developing an inhouse code.

sri

what about c++ plus some mathematics library?

English is pretty good.

I think you can have a look at another discussion in this forum about computer languages for CFD. It could be helpful.

http://www.cfd-online.com/Forum/main.cgi?read=23349

I wrote codes for solving a lid driven cavity flow in both C++ and Fortran on Linux. The Fortran version runs about 30% faster. I plan to rewrite the C++ code using pointers, and see, if there will be any change.

This is a highly emotive question to ask a load of cfd hackers, old and young. Try looking through a recent, long thread started by someone calling themelves "Ringo". (Search in the main discussion forum for Ringo and that thread is listed first.)

You'll find all the usual arguments in there represented with various levels of rigour and emotion (but rarely both together). And the whole thread is summed up nicely by Bert Laney's closing comments.

Take some time out, read the whole thread, you'll learn (I did).

thanks all of you for helping ,and i read the ringo 's post ,i think do caculate by fortran and do simulation by c++,is it all right?

Yep, calculations via fortran, file handling, scripts and GUI via C, C++ or perl.