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Interactions between asteroid fragments during atmospheric entry

Register, P.J. and Aftosmis, M.J. and Stern, E.C. and Brock, J.M. and Seltner, Patrick and Willems, Sebastian and Gülhan, Ali and Mathias, D.L. (2019) Interactions between asteroid fragments during atmospheric entry. Icarus, 337, pp. 1-20. Elsevier. doi: 10.1016/j.icarus.2019.113468. ISSN 0019-1035.

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Official URL: https://doi.org/10.1016/j.icarus.2019.113468


The current work explores the interactions between asteroid fragments and the associated flow topology to motivate a physically consistent representation of the fragmentation process following a fragmentation event during atmospheric entry. Multibody aerodynamic simulations run with computational fluid dynamics (CFD) solvers were used to generate a lookup table of forces detailing the interactions of two spheres. Trajectory simulations parsing the resulting database to determine the relative motions of any two spherical fragments were then validated with hypersonic wind tunnel experiments. A following series of fragment interaction simulations yielded categorization of the fragments' final relative states and an estimate of the total time of interaction. The fragment interaction model was nondimensionalized to permit study over a wide range of possible asteroid impacts. The interaction parameters are presented with explicit semi-analytic equations, defining the asteroid fragment-flow interaction model and thereby eliminating the need to perform a separate fragment interaction simulation for each fragmentation event in an atmospheric entry model. Finally, a set of illustrative examples demonstrates the efficacy of the model in a variety of fragmentation situations.

Item URL in elib:https://elib.dlr.de/129904/
Document Type:Article
Title:Interactions between asteroid fragments during atmospheric entry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Register, P.J.NASA Ames Research CenterUNSPECIFIED
Aftosmis, M.J.NASA Ames Research CenterUNSPECIFIED
Stern, E.C.NASA Ames Research CenterUNSPECIFIED
Brock, J.M.NASA Ames Research CenterUNSPECIFIED
Seltner, PatrickPatrick.Seltner (at) dlr.dehttps://orcid.org/0000-0002-7706-9220
Willems, SebastianSebastian.Willems (at) dlr.dehttps://orcid.org/0000-0002-5576-7829
Gülhan, AliAli.Guelhan (at) dlr.dehttps://orcid.org/0000-0003-4905-5881
Mathias, D.L.NASA Ames Research CenterUNSPECIFIED
Date:24 October 2019
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2019.113468
Page Range:pp. 1-20
EditorsEmailEditor's ORCID iD
Keywords:asteroids, asteroid dynamics, meteors, near-earth objects
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonoc and Hypersonic Technology
Deposited By: Seltner, Herr Patrick
Deposited On:12 Nov 2019 12:20
Last Modified:05 Nov 2020 19:10

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