Browsing by Author "Willen, Daniel P."
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Item Continuity Waves in Resolved-Particle Simulations of Fluidized Beds(Physical Review Fluids, 11/30/2017) Willen, Daniel P.; Sierakowski, Adam J.; Zhou, Gedi; Prosperetti, AndreaThe results of a fully resolved simulation of up to 2000 spheres suspended in a vertical liquid stream are analyzed by a method based on a truncated Fourier series expansion. It is shown that, in this way, it is possible to identify continuity (or kinematic) waves and to determine their velocity, which is found to closely agree with the theory of one-dimensional continuity waves based on the Richardson-Zaki drag correlation.Item Resolved simulations of sedimenting suspensions of spheres(Physical Review Fluids, 1/18/2019) Willen, Daniel P.; Prosperetti, AndreaSeveral results on sedimenting equal spheres obtained by resolved simulations with the Physalis method are presented. The volume fraction ranges from 8.7% to 34.9% and the particle Galilei number from 49.7 to 99.4. The results shown concern particle collisions, diffusivities, the mean free path, the particle pair distribution function, and other features. It is found that many qualitative trends found in earlier studies continue to hold in the parameter range investigated here as well. The analysis of collisions reveals that particles interact prevalently via their flow fields rather than by direct contacts. A tendency toward particle clustering is demonstrated. The time evolution of the shape and size of particle tetrads is examined.