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- W4288804546 abstract "In this paper, we present a multiple-time-step integration algorithm (MTSA) for particle collisions in particle-resolved simulations of particle-laden flows. Since the time step required for resolving a collision process is much smaller than that for the fluid flow, the computational cost obtained by reducing the time step in the traditional soft-sphere model is quite high in particle-resolved simulations of more than thousands of particles. In one state-of-the-art methodology, the collision time needs to be stretched to several times the flow solver time step. However, the stretched collision time is artificial and not physical, and the simulation results are affected by the stretched collision time. The present MTSA used different time steps to resolve the fluid flow, fluid--particle interactions, and particle collisions. We assessed the MTSA for particle--wall collisions as well as particle--particle collisions, determined the optimal iteration number in the substeps, and obtained excellent agreement between experimental measurements and simulation results using the traditional soft-sphere model. The MTSA was then implemented in a simulation of sediment transport (turbulent flow over an erodible particle bed) with thousands of particles. By comparing the results obtained using the MTSA and the stretching collision time algorithm, we found that stretching the collision time reduced the particle stiffness, weakened the particle entrainment, and affected the turbulence and particle statistics. The computational cost of the MTSA could be reduced to about one order of magnitude less than that using the traditional soft-sphere model with almost the same accuracy." @default.
- W4288804546 created "2022-07-30" @default.
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- W4288804546 date "2022-07-28" @default.
- W4288804546 modified "2023-09-27" @default.
- W4288804546 title "A multiple-time-step integration algorithm for particle-resolved simulation with physical collision time" @default.
- W4288804546 doi "https://doi.org/10.48550/arxiv.2207.13969" @default.
- W4288804546 hasPublicationYear "2022" @default.
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