Laurence, Stuart and Deiterding, Ralf (2010) Shock-wave surfing and the separation of meteoroid fragments in the atmosphere. 63rd Meeting of the APS Division of Fluid Dynamics, 2010-11-21 - 2010-11-23, Long Beach, USA.
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Official URL: http://meetings.aps.org/Meeting/DFD10/Event/133913
Abstract
Studying the aerodynamic interactions between bodies travelling at highly supersonic speeds is necessary to our understanding of the separation of meteoroid fragments following atmospheric disruption. Here we show that a phenomenon referred to as "shock-wave surfing'', in which a body moves in such a way as to follow the shock wave generated by another upstream body, can lead to the accumulation of a significantly higher relative lateral velocity between fragments than would otherwise be possible. The surfing phenomenon is investigated for the canonical cases of interactions between a sphere and a wedge, and between two spheres. Numerical simulations are performed and a simple theoretical model is developed to determine the forces acting on the surfing body. A phase-plane description is employed to elucidate features of the system dynamics in both cases. For the two sphere case, a strong influence of the body radius ratio on the separation process is found and a critical ratio is predicted for initially touching fragments that delineates entrainment of the smaller fragment within the larger fragment's shock from expulsion. It is also shown that a large fraction of the variation in the separation behaviour of meteoroid fragments deduced by previous authors from an analysis of terrestrial crater fields can be explained by a combination of surfing and a modest rotation rate of the parent body.
Item URL in elib: | https://elib.dlr.de/67297/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||
Title: | Shock-wave surfing and the separation of meteoroid fragments in the atmosphere | ||||||||||||
Authors: |
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Date: | 2010 | ||||||||||||
Refereed publication: | No | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
Volume: | Vol. 55 | ||||||||||||
Series Name: | Conference Proceedings | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | hypersonic flows, aerodynamic interactions, meteoroid fragmentation | ||||||||||||
Event Title: | 63rd Meeting of the APS Division of Fluid Dynamics | ||||||||||||
Event Location: | Long Beach, USA | ||||||||||||
Event Type: | international Conference | ||||||||||||
Event Start Date: | 21 November 2010 | ||||||||||||
Event End Date: | 23 November 2010 | ||||||||||||
HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||
HGF - Program: | Space (old) | ||||||||||||
HGF - Program Themes: | W RP - Raumtransport | ||||||||||||
DLR - Research area: | Space | ||||||||||||
DLR - Program: | W RP - Raumtransport | ||||||||||||
DLR - Research theme (Project): | W - Grundlagen Raumtransport - Anlagen und Messtechnik (old) | ||||||||||||
Location: | Göttingen | ||||||||||||
Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Spacecraft | ||||||||||||
Deposited By: | Brennecke-Hosseinzadeh, Dagmar | ||||||||||||
Deposited On: | 21 Dec 2010 15:03 | ||||||||||||
Last Modified: | 24 Apr 2024 19:32 |
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