Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1283..137b&link_type=abstract
MATHEMATICS AND ASTRONOMY: A JOINT LONG JOURNEY: Proceedings of the International Conference. AIP Conference Proceedings, Volum
Astronomy and Astrophysics
Astronomy
Meteoroids, Shock Waves, Supersonic Flow, Meteors, Meteorites And Tektites, Planetary Bow Shocks, Interplanetary Shocks, Supersonic And Hypersonic Flows
Scientific paper
There is significant evidence that some fraction of meteoric bodies is destroyed in the atmosphere. The evolution of the fragment cloud depends on a large number of factors, among them: the meteoroidŠs altitude and velocity at the moment of breakup, fragments sizes and properties of a body material. The interaction of shock waves forming in front of the fragments may lead to both an increase and decrease of the midsection area of the fragment cloud [1], [2]. In this work, we consider the inter action of the fragments in a supersonic flow. The configuration properties of two spherical bodies of different radii are considered. Via numerical simulations, we calculate the pressure distribution in the flow around the two bodies for different relative positions. We construct the functions of the coefficients of transverse and drag forces from the angle between the central line of the two bodies and the flow direction for different distances between the two fragments. We find the conditions for the collimation effect, i.e., fragment involving into the wake of the leading (usually, the largest) fragment. We systematize the simulation results for drag and forces and infer the basic aerodynamic properties of the meteoroid fragments. Moreover, in the work dynamics of two spherical fragments in a supersonic stream is defined on the basis of numerical calculations. The aerodynamic properties are accurately expressed in a dynamic picture. Besides, it is obtained, that fragments connect and move as a unit due to aerodynamic interaction.
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