Rise through the Atmosphere of a Hot Bubble
Local PDF: ADA382489.pdf
AD Number: ADA382489
Subject Categories: FLUID MECHANICS
Corporate Author: LOS ALAMOS SCIENTIFIC LAB ALBUQUERQUE NM
Title: Rise through the Atmosphere of a Hot Bubble
Personal Authors: Harlow, Francis H.; Meixner, Billy D.
Report Date: 13 NOV 1962
Pages: 18 PAGES
Report Number: LAMS-2770
Contract Number: W-7405-ENG-36
Monitor Acronym: XF
Monitor Series: XD
Descriptors: *HOT GASES, *FLUID DYNAMICS, NUCLEAR EXPLOSIONS, BUBBLES.
Identifiers: PARTICLE IN CELL METHOD
Abstract: The Particle-in-Cell method for multidimensional fluid-dynamics
calculations has been used on the IBM Stretch Computer to study the motion of a
hot gas bubble created by a nuclear explosion in the earth's atmosphere. In the
example, a total energy of 8.24 x 10(exp 20) ergs was deposited at an altitude
of 95 km. After 2.85 sec the originally-heated air was moving upwards with a
mass-averaged velocity of 3.5km/sec and was still accelerating somewhat,
probably to an asymptotic value of 4.0 km/sec. Along the cylindrical axis at 2.
85 sec, the upwards velocities varied from 0.0 km/sec at the bottom to 5.8 km/
sec at the top; most of the central material was moving at velocities greater
than 4.0 km/sec. This report also includes details concerning bubble shape,
energy histories, and shock configurations.
Limitation Code: APPROVED FOR PUBLIC RELEASE
Source Code: 394961
Citation Creation Date: 18 OCT 2000