Showing papers by "Paul Sánchez published in 2011"
TL;DR: In this article, a soft-sphere distinct element method was used to simulate asteroid regolith and rubble piles and then an algorithm to calculate self-gravity was derived and incorporated for full-scale simulations of rubble-pile asteroids using Granular Dynamics techniques.
Abstract: This paper applies a soft-sphere distinct element method Granular Dynamics code to simulate asteroid regolith and rubble piles. Applications to regolith studies in low gravity are also studied. Then an algorithm to calculate self-gravity is derived and incorporated for full-scale simulations of rubble-pile asteroids using Granular Dynamics techniques. To test its validity, the algorithm's results are compared with the exact direct calculation of the gravitational forces. Further avenues to improve the performance of the algorithm are also discussed.
97 citations
01 Mar 2011
TL;DR: Sanchez et al. as discussed by the authors used Soft-Sphere DEM code to simulate the reshaping and disruption of a self-gravitating 3D granular aggregate by increasing its spin rate.
Abstract: Sanchez(Diego.Sanchez − lana@colorado.edu), Daniel J. Scheeres, CCAR, University of Colorado, Boulder, USA. Using a Soft-Sphere DEM code we simulate the reshaping and disruption of a self-gravitating 3D granular aggregate by increasing its spin rate. During the process, we monitor the evolution of the internal stresses in the aggregate to find its yield stress using the Von Mises and Maximum Stress yield criteria. In the simulations we either increase the number of particles or their density to increase the total mass of the aggregate and find an increment in the yield stress. In addition, once a reshaping spin rate (density dependent) has been reached, its further increase causes further reshape (ultimately fission) and a decrease in the spin rate itself.