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Shock-wave surfing

Laurence, Stuart und Deiterding, Ralf (2011) Shock-wave surfing. Journal of Fluid Mechanics, 676 (06), Seiten 1-36. Cambrigde University Press. DOI: 10.1017/S0022112011000577. ISSN 0022-1120.

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Offizielle URL: http://journals.cambridge.org

Kurzfassung

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, is investigated numerically and analytically. During the surfing process, the downstream body can accumulate a significantly higher lateral velocity than would otherwise be possible. The surfing effect is first investigated for interactions between a sphere and a planar oblique shock. Numerical simulations are performed and a simple analytical model is developed to determine the forces acting on the sphere. A phase-plane description is employed to elucidate features of the system dynamics. The analytical model is then generalised to the more complex situation of aerodynamic interactions between two spheres, and, through comparisons with further computations, is shown to adequately predict the final separation velocity of the surfing sphere in initially touching configurations. Both numerical simulations and a theoretical analysis indicate a strong influence of the sphere radius ratio on the separation process and predict a critical radius ratio that delineates entrainment of the smaller body within the flow region bounded by the larger body’s shock from expulsion. Furthermore, it is shown that an earlier scaling law does not accurately describe the separation behaviour. The surfing effect has important implications for meteoroid fragmentation: in particular, a large fraction of the variation in the separation velocity 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.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:Published online: 06 April 2011, Juni 2011
Titel:Shock-wave surfing
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Laurence, Stuartstuart.laurence@dlr.de
Deiterding, RalfOak Ridge National Laboratory
Datum:2011
Erschienen in:Journal of Fluid Mechanics
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:676
DOI :10.1017/S0022112011000577
Seitenbereich:Seiten 1-36
Verlag:Cambrigde University Press
ISSN:0022-1120
Status:veröffentlicht
Stichwörter:flow–structure interactions, high-speed flow, shock waves
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W RP - Raumtransport
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):W - Grundlagen Raumtransport - Anlagen und Messtechnik (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Raumfahrzeuge
Hinterlegt von: Stuart Laurence
Hinterlegt am:15 Apr 2011 13:47
Letzte Änderung:26 Mär 2015 11:01

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