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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Richardson, Derek C.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2021Creep stability of the DART/Hera mission target 65803 Didymos: II. The role of cohesioncitations
- 2019Finite element method approach for quantifying the conditions for shape deformation of the primary of binary asteroid Didymos after the DART impact
- 2018Rotational Failure of Rubble-pile Bodies: Influences of Shear and Cohesive Strengthscitations
- 2014Low-speed impact simulations into regolith in support of asteroid sampling mechanism design I: Comparison with 1-g experimentscitations
- 2013Numerically simulating impact disruptions of cohesive glass bead agglomerates using the soft-sphere discrete element methodcitations
- 2012Numerical Simulations of Landslides Calibrated Against Laboratory Experiments for Application to Asteroid Surface Processes
- 2012Numerical Simulations of Low-Speed Impact Disruption of Cohesive Aggregates Using the Soft-Sphere Discrete Element Method and Comparison with Experiments on Sintered-Glass-Bead Agglomerates
- 2011Simulations of low-speed impacts into cohesive aggregates and comparison with experiments on sintered glass bead agglomerates
- 2007Rotational Disruption of Gravitational Aggregates with Cohesive Strength
- 2007Numerical Studies of Satellite-Ring Interactions
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document
Numerical Studies of Satellite-Ring Interactions
Abstract
We report on an ongoing study of planetary ring dynamics. We use local simulations to examine the effects of gravitational perturbations by a small moonlet on patches of ring material of scale 10<SUP>4-6</SUP> km<SUP>2</SUP>. We use the numerical code pkdgrav to model the motions of 10<SUP>5-7</SUP> ring particles as they interact by self-gravity and collisions, using a sliding patch model with periodic boundary conditions. Our boundary conditions include a randomization routine that erases perturbations by the moonlet when particles wrap azimuthally. We run this highly parallelizable code on local clusters and national supercomputers. <P />Our method allows us to explore a wide parameter space, including particle size distributions, particle density, surface friction, and coefficient of restitution; moonlet size, shape, density, rotation, eccentricity, and vertical oscillation; patch size, gap width, two or three-dimensional geometries, and ring surface density (i.e. optical depth). In addition, particle self-gravity and collisions can be turned off independently. We have only begun to explore this huge parameter space. <P />Our work thus far has been to further constrain the mass, density, and eccentricity of the moonlet Daphnis, located in the Keeler gap, by varying the moonlet mass and eccentricity, and (for the first time) using a realistic non-spherical shape model for the moonlet. We also aim to provide further constraints on the equilibrium spins states, and the collisional and surface properties (viscosity) of the ring particles, by varying the surface friction, density, and coefficient of restitution of the particles. Future improvements to the model include adding a cohesive strength model to study the effect of sticky particle aggregation on equilibrium ring properties. We report on results from our latest simulations and compare edge-wave formation with linear analytical theory. <P />This work is supported by a NASA Earth and Space Science Fellowship. <P />...