LMGC90: a Contact Dynamics open source code for the simulation of granular asteroid with realistic regolith shapes. Application to the accretion process

Published on Jul 5, 2021in Epj Web of Conferences
· DOI :10.1051/EPJCONF/202124914007
Paul Sánchez16
Estimated H-index: 16
(Colorado Center for Astrodynamics Research),
Emilien Azéma21
Estimated H-index: 21
(Institut Universitaire de France)
Source
Abstract
References16
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This paper presents an unresolved computational fluid dynamic–discrete element method (CFD–DEM) model for the simulation of flows mixing fluid and grains. The grains trajectories are solved at a fine scale using a discrete element method. It provides the velocities and the trajectories of the grains with an accuracy that is needed to describe microscopic phenomena like clogging in pipe happening in these flows. Solved at a coarse scale using the finite element method, the fluid motion is deduced...
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This paper documents the prearrival planning strategy and analysis for the deployment of rovers on board the Japanese Hayabusa2 asteroid sample return mission. This will allow for rigorous comparison with postarrival results obtained at a future date. Hayabusa2 will arrive at asteroid Ryugu sometime between June and July of 2018. During its stay, the spacecraft will deploy three MINERVA-II rovers and obtain several surface samples. The autonomous Hayabusa2 descent guidance requires the rovers to...
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Abstract Geotechnical properties of a granular material affect all surface operations from mobility to landing and excavation. As such, significant efforts to study and model these properties are necessary before sending a spacecraft. Lack of knowledge of regolith material properties adversely affected Apollo, Lunokhod, and Mars Exploration Rover missions; hence additional measures need to be undertaken to prevent potential failures or delays of future missions, in particular missions to explore...
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When velocity jumps are occurring, the dynamics is said to be nonsmooth. For instance, in collections of contacting rigid bodies, jumps are caused by shocks and dry friction. Without compliance at the interface, contact laws are not only non-differentiable in the usual sense but also multi-valued. Modeling contacting bodies is of interest in order to understand the behavior of numerous mechanical systems such as flexible multi-body systems, granular materials or masonry. These granular materials...
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The Hayabusa2 mission journeys to C-type near-Earth asteroid (162173) Ryugu (1999 JU3) to observe and explore the 900 m-sized object, as well as return samples collected from the surface layer. The Haybusa2 spacecraft developed by Japan Aerospace Exploration Agency (JAXA) was successfully launched on December 3, 2014 by an H-IIA launch vehicle and performed an Earth swing-by on December 3, 2015 to set it on a course toward its target Ryugu. Hayabusa2 aims at increasing our knowledge of the early...
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