Program was written to include integration of surface pressure in order to obtain axial-force, normal-force, and pitching-moment coefficients. Program was written in CDC FORTRAN for the CDC-6600 computer system

Jackson, C. M., Jr.

Sawyer, W. C.

Smith, R. S.

English

NASA Technical Reports Server

October 1973	 B73-10362 
NASA TECH BRIEF 
Langley Research Center 
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. 
Computer Program to Determine Pressure Distributions and 
Forces on Blunt Bodies of Revolution 
C
The problem: 
A process was needed to obtain the surface pressures 
along meridian lines of blunt bodies of revolution. 
The solution: 
A computer program was written to include the 
integration of the surface pressures in order to obtain 
the axial-force, normal-force, and pitching-moment co-
efficients. 
How it's done: 
The program reads-in the body geometry in terms of 
a spherical nose-cap radius and x,y coordinates starting 
at the point of tangency to the nose cap. The program 
then generates for the desired radial angles 0 the 
equivalent bodies which represent the shape of the 
meridian lines of the body at the input angle of attack. 
The program represents the longitudinal shape of these 
bodies by straight-line elements between the transformed 
input coordinates. The spherical cap from the stagnation 
point to the tangency point is represented by 20 
straight-line segments. After the equivalent bodies are 
obtained, the pressure distributions are computed and
integrated along the respective meridian lines of the 
input body to obtain the forces and moments. By 
selecting output options, the pressure and Mach number 
variations for each meridian line can be obtained with 
the forces and moments, or just the forces and moments 
can be output. 
Notes: 
1. This program was written in CDC FORTRAN (Run 
2.3) for the CDC-6600 computer system. 
2. Inquiries concerning this program should be directed 
to:
COSMIC 
University of Georgia 
112 Barrow Hall 
Athens, Georgia 30602 
Reference: LAR-1 1197 
Source: Charlie M. Jackson, Jr.,
Wallace C. Sawyer, and Rudeen S. Smith
Langley Research Center
(LAR-1 1197) 
Category 09, 06 
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.
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Computer program to determine pressure distributions and forces on blunt bodies of revolution

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