CGT 0.8 Release Announcement

Release of Chimera Grid Tools Version 0.8

Version 0.8 of Chimera Grid Tools is now ready for your testing and use. This version is a major upgrade from 0.7. Highlights of new features include a major upgrade to the OVERGRID GUI program, a new system of automation scripts, new examples, and new Makefiles. In addition, this version has been compiled and installed to provide an execution-ready environment for most of the NAS machines, you just have to change your path and add an environment variable. Here are some of the details of things included in this new release:

OVERGRID version 1.0

capability to read and operate on double precision files (current implementation degrades GUI efficiency for large files, next release will involve another re-write to improve efficiency)
redesigned SURGRD interface that uses direct screen picking for initial curve and reference entities specification
grid quality diagnostics for surfaces and curves (stretching ratio, turning angle, truncation error)
display of fringe points (colored by iblank value) and orphan points
auto display of point coordinates and iblank value for point subset
new GRIDED functions for splitting an entity along const. J, K, or L at a specified index, entity IDs swapping and resequencing
tog button to swap blanked and unblanked entities
buttons to reset view to front/back/left/right/top/bottom
file path names up to 200 characters are now accepted
option to write file with or without iblanks
edge labels for highlighted or screen picked entity
new .overgridrc format for storing preferences on single AND double precision executables directories and background color.

Configuration Automation Scripts: These scripts are a major addition to the Chimera Grid Tools which can be used to automate parts of the overset gridding process, and provide a mechanism for developing a number of different configurations from a complex geometry with many different components. The user must supply the surface grids and must define the boundary conditions to be applied to these surface grids. The script system includes these new tools:

BuildSurf: updates all surface grids defined for the current configuration
BuildVol: builds all volume grids with minimal user input
BuildProgrdi: builds input file for the PROGRD program
BuildPegi: builds part of a PEGSUS 4.1 input file
BuildPeg5i: builds a PEGSUS 5.0 input file
RunPeg: builds volume-grid input file for PEGSUS, performs PEGSUS run(s), runs PROGRD for post-PEGSUS projections, and reruns PEGSUS
BuildPlot: builds composite file containing current surface or volume grids, and build PLOT3D 4.0 command file to view no-slip walls, boundary conditions, or families.
BuildMixsuri: builds input file for the MIXSUR program
BuildOveri: builds final OVERFLOW input file

Makefiles are now generated with a configure script which automatically determines which type of hardware platform you have; many of the make options have changed.
All of the examples now follow a uniform format, and many of them have been rewritten to utilize new scripts and utilities. HYPGEN examples have also included.
Users on NAS machines have the option to link to pre-compiled executables on server machines. Choose the appropriate installation, and make both both of the following additions to your path and to your environment. To access these directories on vn, eagle, or newton[1234], you must be added to our Access Control List (ACL). Contact Stuart Rogers, rogers@nas.nasa.gov, to be added. (If you are a user outside NASA, you will have to sign a non-disclosure statement first). These examples are for /bin/csh users:

SGI workstations on .nas.nasa.gov network, single precision:

set path = ( /r/octane13/u/wk/chimera/cgt0.8/bin $path )

setenv SCRIPTLIB /r/octane13/u/wk/chimera/cgt0.8/scriptlib

SGI workstations on .nas.nasa.gov network, double precision:

set path = ( /r/octane13/u/wk/chimera/cgt0.8_dp/bin $path )

setenv SCRIPTLIB /r/octane13/u/wk/chimera/cgt0.8_dp/scriptlib

vn, eagle, and newton:

set path = ( /usr/unsupported/bin/chimera/cgt0.8/bin $path )

setenv SCRIPTLIB /usr/unsupported/bin/chimera/cgt0.8/scriptlib

Want to Get It?

If you would like to get a copy of CGT 0.8 sent to you, contacted one of us via email: <wchan@nas.nasa.gov> or < rogers@nas.nasa.gov> . If you have never obtained a copy of the Chimera Grid Tools software package before, you will first have to apply, and sign a Non-Disclosure Agreement. As usual, bug reports and comments are highly appreciated.

Keep In Touch

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