Volume 635, March 2020
|Number of page(s)||18|
|Section||Planets and planetary systems|
|Published online||01 April 2020|
Luminosity calculation of meteor entry based on detailed flow simulations in the continuum regime
von Karman Institute for Fluid Dynamics,
2 Université Catholique de Louvain, Institute of Mechanics, Materials and Civil Engineering, Place du Levant 2, 1348 Louvain-la-Neuve, Belgium
3 CMAP, École Polytechnique, Route de Saclay, Palaiseau 91128, France
Accepted: 17 February 2020
Context. Composition, mass, and trajectory parameters of meteors can be derived by combining observations with the meteor physics equations. The fidelity of these equations, which rely on heuristic coefficients, significantly affects the accuracy of the properties inferred.
Aims. Our objective is to present a methodology that can be used to compute the luminosity of meteor entry based on detailed flow simulations in the continuum regime.
Methods. The methodology consists in solving the Navier–Stokes equations using state-of-the-art physico-chemical models for hypersonic flows. It includes accurate boundary conditions to simulate the surface evaporation of the molten material and coupled flow-radiation effects. Such detailed simulations allow for the calculation of heat-transfer coefficients and luminous efficiency, which can be incorporated into the meteor physics equations. Finally, we integrate the radiative transfer equation over a line of sight from the ground to the meteor to derive the luminosity magnitude.
Results. We use the developed methodology to simulate the Lost City bolide and to derive the luminosity magnitude, obtaining good agreement between numerical results and observations. The computed color index is more prominent than the observations. This is attributed to a lack of refractory elements such as Ca in the modeled flow that might originate from the vaporization of droplets in the trail, a phenomenon currently not included in the model.
Key words: meteorites, meteors, meteoroids / shock waves / methods: numerical / radiation mechanisms: thermal
© ESO 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.