Unable to open a cgns file

Okey, this is not a core programming question; it is more of a question regarding cgns (CFD general notational system) API.

I've exported a grid/mesh file from ANSYS Fluent (which was first created in Gambit 2.46), and I wrote a very simple Fortran program to open and close it (doing nothing else). To check the file is not corrupt I plotted it in Tecplot.

So, when I compiled using gfortran with the mentioned cgns and ran the program I got this error (as part of cg_error_exit_f())

ADF_Database_Open:File does not exist or is not a HDF5 file

Here is the program

program cavity
include "/usr/include/cgnslib_f.h"
call cg_open_f("Cavity.cgns",CG_MODE_READ,index_file,ier)
!check for error if so exit
if (ier .ne. CG_OK) then
call cg_error_exit_f()
end if
write(*,*)"I kind of opened the file?"
call cg_close_f(index_file,ier)
stop
end program cavity

I'm able to write both structured and unstructured grids in cgns format, without any problem.

I suspect the cgns library I'm using(version 2.5.5 packaged in Fedora 15 and Scientific linux 6.1) is built to support only HDF5, while the exported grid file is written in ADF format.

Any ideas to circumvent this or perhaps adding ADF? Which by the way is not packaged in both the distribu开发者_运维百科tions. Any other grid generator which is compatible with cgns version 2.5.5?

I hope I was clear. Any further info required, I would provide.

There is so much that could've gone wrong in here, and I'm afraid you didn't exactly narrow the problem down.

You said you exported a file from Fluent (what kind of a file is it? Be sure!). cg_error_exit_f() gave you an error listed. I'm assuming you have the source of the mentioned routines? In the program you include a cgnslib_f.h file - what's in it? I'm assumming the program compiled without errors of any kind, making this a file format question, not a fortran question.

Again, verify what kind of file Fluent produced.

When I ran into this situation, I discovered the following tools: hdf2adf adf2hdf

They are in the cgns-convert package on Ubuntu and are probably available for your distribution as well.