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Numerical Simulation of Bolide Entry with Ground Footprint PredictionAs they decelerate through the atmosphere, meteors deposit mass, momentum and energy into the surrounding air at tremendous rates. Trauma from the entry of such bolides produces strong blast waves that can propagate hundreds of kilometers and cause substantial terrestrial damage even when no ground impact occurs. We present a new simulation technique for airburst blast prediction using a fully-conservative, Cartesian mesh, finite-volume solver and investigate the ability of this method to model far- field propagation over hundreds of kilometers. The work develops mathematical models for the deposition of mass, momentum and energy into the atmosphere and presents verification and validation through canonical problems and the comparison of surface overpressures, and blast arrival times with actual results in the literature for known bolides. The discussion also examines the effects of various approximations to the physics of bolide entry that can substantially decrease the computational expense of these simulations. We present parametric studies to quantify the influence of entry-angle, burst-height and other parameters on the ground footprint of the airburst, and these values are related to predictions from analytic and handbook-methods.
Document ID
20160000296
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Aftosmis, Michael J. (NASA Ames Research Center Moffett Field, CA United States)
Nemec, Marian (Science and Technology Corp. Moffett Field, CA, United States)
Mathias, Donovan L. (NASA Ames Research Center Moffett Field, CA United States)
Berger, Marsha J. (Science and Technology Corp. Moffett Field, CA, United States)
Date Acquired
January 6, 2016
Publication Date
January 4, 2016
Subject Category
Space Sciences (General)
Numerical Analysis
Report/Patent Number
ARC-E-DAA-TN27232
Meeting Information
Meeting: AIAA SciTech 2016
Location: San Diego, CA
Country: United States
Start Date: January 4, 2016
End Date: January 8, 2016
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NNA10DF26C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Simulation
Bodine
Prediction

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