New and versatile method has been developed to supplement or replace use of original CINDA thermal analyzer program in order to take advantage of improved systems software and machine speeds of third generation computers. CINDA-3G program options offer variety of methods for solution of thermal analog models presented in network format

Gaski, J. D.

Lewis, D. R.

Thompson, L. R.

English

NASA Technical Reports Server

December 1972	 B72-10721 
NASA TECH BRIEF 
Manned Spacecraft Center
	
-4r 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Chrysler Improved Numerical Differencing Analyzer for Third 
Generation Computers 
CINDA-3G 
Ll 
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The problem: 
To develop a new and versatile method to supplement 
or replace use of the original CINDA thermal analyzer 
program in order to take advantage of the improved 
systems software and the machine speeds of third 
generation computers. 
The solution: 
CINDA-3G, developed for third generation computers, 
is virtually identical to the original CINDA, but it has 
been almost completely rewritten to take advantage of 
the improved systems software and third generation 
computers. 
How it's done: 
CINDA-3G provides a complete update to handle the 
job. Whereas CINDA was virtually a self-contained 
program having its own Update, Monitor, and Compiler, 
the CINDA-3G foundation consists of a preprocessor 
which accepts the same user input data and converts 
it to advanced FORTRAN.
 subroutines and block data 
input which is then passed on to the systemFORTRAN 
Compiler. While this requires a double pass on data 
where previously only one was required, the increased 
speed and improved software of the 3rd generation 
machines more than compensate. 
The CINDA-3G program options offer the user a 
variety of methods for solution of thermal analog 
models presented to it in a network format. The net-
work representation of the thermal problem is unique 
in that it has a one-to-one correspondence to both the 
physical model and the mathematical model. This 
analogy enables engineers to quickly construct mathe-
matical models of complex thermophysical problems 
and prepare them for program input. In addition, the 
program contains numerous subroutines for handling 
interrelated complex phenomena such as sublimation, 
diffuse radiation within enclosures, and simultaneous
l-D incompressible fluid flow, including valving and 
transport delay effects. The optional combination of 
these capabilities in conjunction with the model size 
allowable (greater than 4000 nodes for a linear 3-D 
system on 65 K core) makes CINDA-3G an extremely 
potent analytical tool for thermal systems analysis. 
The program is virtually identical to its predecessor 
(CINDA) which was a dimensionless multi-option systems 
compiler program. It constructs and analyzes a mathe-
matical model of any one, two, or three dimensional, 
lumped parameter representation of a physical system 
governed by a set of diffusion equations; e.g., the 
Fourier equation with an additional source term. To 
utilize the program, a user must construct a thermal 
analog network representation of the physical system, 
uniquely number all of the elements, and input the 
information in the required format. Nonlinear material 
properties and boundary conditions may be calculated 
simultaneously as a function of one or more independent 
variables. Nonlinear transfer functions may be treated 
as effective nonlinear transfer properties and handled 
in the above manner. 
Notes: 
1. The program is written in FORTRAN V and SLEUTH 
II assembly language for use on the UNIVAC 1108 
computer. 
2. This program is an update of and ultimately replaces 
the original CINDA program, Tech Brief Number 
67-10278. 
3. Inquiries concerning this innovation may be directed 
to:
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: MSC-1 1653
(continued overleaf) 
• 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19720000720 2020-03-17T03:44:25+00:00Z
Source: J. D. Gaski, D. R. Lewis, L. R. Thompson of 
Chrysler Corporation	 40 
under contract to
Manned Spacecraft Center

(MSC-1 1653)
. 
40 
B72-10721	 Category 03, 09


Chrysler improved numerical differencing analyzer for third generation computers CINDA-3G

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