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CFD General Notation System
Mid-Level Library

Document Version 3.2.1
CGNS Version 3.2.1

This document outlines a CGNS library designed to ease implementation of CGNS by providing developers with a collection of handy I/O functions. Since knowledge of the database manager and file structure is not required to use this library, it greatly facilitates the task of interfacing with CGNS.

The CGNS Mid-Level Library is based on the SIDS File Mapping Manual. It allows reading and writing all of the information described in that manual including grid coordinates, block interfaces, flow solutions, and boundary conditions. Use of the mid-level library functions insures efficient communication between the user application and the internal representation of the CGNS data.

It is assumed that the reader is familiar with the information in the CGNS Standard Interface Data Structures (SIDS), as well as the SIDS File Mapping Manual. The reader is also strongly encouraged to read the User's Guide to CGNS, which contains coding examples using the Mid-Level Library to write and read simple files containing CGNS databases.

The complete CGNS Mid-Level Library document in HTML form is also available for installation on a local system. This is a gzip'ed tar file (50K, 378K gunzip'ed), and may be downloaded by clicking on the link while holding down the shift key, assuming your browser supports this capability. A dialogue box will appear for you to specify the directory and file name. To unpack the contents, do

   gunzip -c midlevel.tar.gz | tar xvf -
The files will be extracted and stored in the directory midlevel. Point your browser to the local file midlevel/index.html to display the CGNS Mid-Level Library home page. Note also that some links, to other manuals, etc., may not work.