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1 January 2015 Direct Simulation of Drag Force on Fractal Flocs during Settling
Jinfeng Zhang, Qinghe Zhang
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Zhang, J. and Zhang, Q., 2015. Direct simulation of drag force on fractal flocs during settling.

The hydrodynamic drag force of fractal flocs during settling is examined by the Lattice Boltzmann method. Fractal flocs formed by Diffusion-Limited Aggregation (DLA) and diffusion-limited-cluster-cluster aggregation (DLCCA) models settle down in the quiescent water and drag forces are directly calculated. The numerical simulations are consistent with the analytical results. The ratio of drag force on fractal flocs and floc size shows a linear relationship with the floc settling velocity when the flow filed around the flocs is Stokes flow. The drag coefficient experienced by flocs is significantly different from the spheres. Moreover, drag forces on flocs formed by DLCCA are larger than flocs formed by DLA, when the flocs are composed of the same primary particles.

© 2015 Coastal Education and Research Foundation
Jinfeng Zhang and Qinghe Zhang "Direct Simulation of Drag Force on Fractal Flocs during Settling," Journal of Coastal Research 73(sp1), 753-757, (1 January 2015).
Received: 21 August 2014; Accepted: 16 November 2014; Published: 1 January 2015
drag coefficient
Drag force
fractal flocs
lattice boltzmann method.
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