Collisionless kinetic theory for saltation
Résumé
We employ the methods of statistical mechanics to obtain closures for the balance equations of momentum and fluctuation kinetic energy that govern the ballistic motion of grains rebounding at a bed driven by turbulent or nonturbulent shearing fluids, in the absence of midtrajectory collisions. We obtain semi analytical solutions to steady and fully developed saltation over horizontal, rigid, bumpy beds for the vertical profiles of particle concentration and stresses, and fluid and particle velocity; these compare favorably with measurements in discreteelement numerical simulations in a wide range of conditions that apply to Earth and other planetary environments. The predictions of the particle horizontal mass flux and its scaling with the amount of particles in the system, the properties of the carrier fluid and the intensity of the shearing also agree with numerical simulations and wind tunnel experiments.
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Licence : Copyright (Tous droits réservés)
Licence : Copyright (Tous droits réservés)