Ablating-surface boundary conditions involve considerations of surface thermochemistry. Several programs may be used to provide surface thermochemistry information

Kendall, R. M.

Powars, C. A.

English

NASA Technical Reports Server

May 1973	 B73-10065 
NASA TECH BRIEF 
Lewis Research Center 
NASA Tech Briefs announce now 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. 
Aerotherm Charring . Materials Ablation Computer Program 
The Problem: 
To determine the transient transport of thermal energy 
in a three-dimensional material. 
The Solution: 
A program designed to evaluate and analyze data from 
the computer program ACE (LEW . 1 1722). 
How It's Done: 
The Aerotherm Charring Materials Ablation (ACMA) 
program is an implicit, finite-difference computational 
procedure for computing the one-dimensional transient 
transport of thermal energy in a three-dimensional iso-
tropic material which can ablate from a front surface and 
•	 which can decompose in depth. 
The ablating-surface boundary conditions involve con-
siderations of surface thermochemistry. In principle, these 
surface thermochemical calculations could be performed 
within the ACMA program, however, it has proved more 
expedient to do these calculations in a separate program 
and use the tabulated results in the ACMA program. 
A number of programs may be used to provide the 
surface thermochemistry information. One program 
specifically intended for this purpose and specifically 
designed to complement the ACMA program is the 
Aerotherm Chemical Equilibrium Program (ACE) 
(Reference: LEW-11722). The output from ACE can be 
used directly as input to the ACMA program.
Notes: 
1. This program is written in FORTRAN IV (or 
FORTRAN 63) for use on the IBM 7090/7094 and 
CDC-1604. 
2. Inquiries concerning this program should be directed 
to:
COSMIC 
Computer Center 
Information Services 
112 Barrow Hail 
University of Georgia 
Athens, Georgia 30602 
Reference: LEW-1 1854 
Source: C.A. Powars and R.M. Kendal

Acurex Corporatiot
under contract t

Le',vis Research Cente 
(LEW. 1 1854 
Category 09 
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Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
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Aerotherm charring materials ablation computer program

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