A collision model for grain-resolving simulations of flows over dense, mobile, polydisperse granular sediment beds

We present a collision model for phase-resolved Direct Numerical Simulations of sediment transport that couple the fluid and particles by the Immersed Boundary Method. Typically, a contact model for these types of simulations comprises a lubrication force for particles in close proximity to another...

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Bibliographic Details
Published in:Journal of computational physics 2017-07, Vol.340 (C), p.105-127
Main Authors: Biegert, Edward, Vowinckel, Bernhard, Meiburg, Eckart
Format: Article
Language:English
Subjects:
Boundary conditions
Collision dynamics
Collisions
Computational physics
Computer simulation
Contact force
Contact modeling
Direct numerical simulations
ENGINEERING
Immersed boundary method
Lubrication
Mathematical models
Model testing
Particle-laden flow
Sediment transport
Simulation
Time integration
Ultrasonic testing
Viscous flow
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Summary:We present a collision model for phase-resolved Direct Numerical Simulations of sediment transport that couple the fluid and particles by the Immersed Boundary Method. Typically, a contact model for these types of simulations comprises a lubrication force for particles in close proximity to another solid object, a normal contact force to prevent particles from overlapping, and a tangential contact force to account for friction. Our model extends the work of previous authors to improve upon the time integration scheme to obtain consistent results for particle–wall collisions. Furthermore, we account for polydisperse spherical particles and introduce new criteria to account for enduring contact, which occurs in many sediment transport situations. This is done without using arbitrary values for physically-defined parameters and by maintaining the full momentum balance of a particle in enduring contact. We validate our model against several test cases for binary particle–wall collisions as well as the collective motion of a sediment bed sheared by a viscous flow, yielding satisfactory agreement with experimental data by various authors.
ISSN:0021-9991
1090-2716
DOI:10.1016/j.jcp.2017.03.035