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Shock-wave surfing and the separation of meteoroid fragments in the atmosphere

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, 21.-23. Nov. 2010, Long Beach, USA.

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Official URL: http://meetings.aps.org/Meeting/DFD10/Event/133913


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/
Document Type:Conference or Workshop Item (Speech)
Title:Shock-wave surfing and the separation of meteoroid fragments in the atmosphere
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Laurence, Stuartstuart.laurence (at) dlr.deUNSPECIFIED
Deiterding, RalfOak Ridge National Laboratories, Oak RidgeUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Volume:Vol. 55
Series Name:Conference Proceedings
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 Dates:21.-23. Nov. 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:21 Dec 2010 15:03

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