Dimensionless multioption systems compiler computer program constructs and analyzes a mathematical model of any arbitrary one, two, or three dimensional lumped parameter representation of a physical system. It automatically optimizes the utilization of computer core space and is more general and versatile than BETA

Gaski, J. D.

Lewis, D. R.

English

NASA Technical Reports Server

August 1967	 Brief 67-10278 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
CINDA: Chrysler Improved Numerical Differencing Analyzer
Computer Program 
The problem: 
To develop a multioption systems computer pro-
gram that constructs and analyzes a mathematical 
model of any arbitrary one, two, or three dimensional 
lumped parameter representation of a physical system. 
The program should automatically optimize the utili-
zation of computer core space and should be more 
general and versatile than BETA (Boeing Engineering 
Thermal Analyzer) which is primarily limited to 
thermal analysis. A numerical analyzer program 
which solves a set of diffusion equations and the state 
variable could represent field and flow potentials other 
than temperature. 
The solution: 
CINDA is a dimensionless, multioption systems 
compiler computer program. It constructs and ana-
lyzes a mathematical model of any arbitrary one, two, 
or three dimensional lumped parameter representation 
of a physical system governed by a set of diffusion 
equations, i.e., the Fourier equation with an addi-
tional source term. 
How it's done: 
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 proper-
ties and handled in the above manner.
The program options offer the user a variety of 
methods for the solutions of the set of simultaneous 
equations each differing in machine speed, core space 
required and solution accuracy. A wide variety of 
computational subroutines are available and are con-
tinually being added to the program. These subrou-
tines do or will make available to the user various 
methods of calculating aerodynamic and orbital heat-
ing rates, several methods of computing convective 
heat transfer coefficients, and several methods of 
calculating material phase changes (ablation, sublima-
tion , and vaporization). In addition, the program can 
solve a set or sets of simultaneous equations of the 
Poisson type either by relaxation or exact methods. 
The diffusion and Poisson sets may be coupled in any 
desired manner to yield the solution of a simultane-
ous system of equations. This capability has been 
successfully applied to rather large incompressible 
thermal fluid flow problems. 
Notes: 
1. The machine requirements are an IBM 7090 or 
7094 computer. 
2. The present program is written in 95% Fortran II 
and 5% FAP, but a Fortran IV version suitable 
for third generation computer and a Fortran V 
version for the Univac 1108 computer will soon be 
available. 
3. This program is an updated version of the Boeing 
Engineering Thermal Analyzer (BETA) program, 
which is described in Tech Brief 66-10404, "New 
Computer Program Solves Wide Variety of Heat 
Flow Problems" (Sept. 1966).
(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=19670000278 2020-03-11T20:37:35+00:00Z
Inquiries concerning this program may be di- 	 Patent status: 
rected to:	 No patent action is contemplated by NASA. 
COSMIC
	
Source: J. D. Gaski and D. R. Lewis 
Computer Center	 of Chrysler Corporation 
University of Georgia 	 under contract to 
Athens, Georgia 30601
	
Marshall Space Flight Center 
Reference: B67-10278
	 (M-FS-2298) 
Brief 67-10278	 Category 06


CINDA - Chrysler Improved Numerical Differencing Analyzer computer program

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