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.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Shock-wave surfing and the separation of meteoroid fragments in the atmosphere|
|In ISI Web of Science:||No|
|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)|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Spacecraft|
|Deposited By:||Dagmar Brennecke-Hosseinzadeh|
|Deposited On:||21 Dec 2010 15:03|
|Last Modified:||21 Dec 2010 15:03|
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