Computer program to generate time history of load factor and pressure on conical body of revolution during impact with water is discussed. Program calculates depth of penetration, velocity, force, load factor, maximum pressure at water line, and average pressure. Program is written in FORTRAN 4 Level H for IBM 360/85/195 Release 20.1 computer

Safronski, S. G.

Sanders, D. H.

English

NASA Technical Reports Server

October 1972	 B72-10621 
NASA TECH BRIEF 
Marshall Space Flight 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. 
Water Impact Loads 
The problem:	 Some possible uses of the program are for military 
To be able to generate time history of load factor and 	 ordinance, water recovery of space and military vehicles, 
pressure at the water line of a conical body of	 and dropping of commercial or military payloads from 
revolution impacting water.	 aircraft. 
The solution: 
A computer program was developed to do the above 
calculations. 
How it's done: 
This program calculates a time history of depth of 
.
penetration, velocity, force, load factor, maximum 
pressure at the water line, and average pressure for a 
body of revolution impacting water. The nose shape of 
the body can be conical or a truncated cone frustum 
with a spherical nose cap. Forces on the body during 
submergence of the nose section are based on virtual 
mass theory. 
For submergence past the nose cone, body motion 
is determined by hydrodynamic drag. Either a drag co-
efficient for the body is calculated to balance the forces 
from the virtual mass theory at the intersection of the 
cylinder and nose cone or a coefficient of drag can be 
input to replace the calculated value.
Notes: 
1. This program is written in FORTRAN IV Level H for 
the IBM-360/85/195 Release 20.1 computer. How-
ever, the program has been compiled on an IBM-360/ 
65 computer. 
2. Inquiries concerning this program should be directed 
to:
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: MFS-2 1955 
Source: Donald H. Sanders and
Stanley G. Safronski of

McDonnell Douglas Corp. 
under contract to

Marshall Space Flight Center 
(MFS-2 1955) 
Category 09 
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=19720000620 2020-03-17T03:36:22+00:00Z


Water impact loads

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