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Hydrodynamic forces on randomly formed marine aggregates

Eunji Yoo, Shilpa Khatri, and François Blanchette*

  • Department of Applied Mathematics, University of California, Merced, 5200 N. Lake Road, Merced, California 95343, USA

  • *fblanchette@ucmerced.edu
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Phys. Rev. Fluids 5, 044305 – Published 23 April, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.044305

Abstract

We study numerically the fluid forces acting on aggregates formed by a collation of cubic particles as a model of marine aggregates in the ocean. The flow around the aggregates and the resulting stresses on the surface of the aggregates are computed in the limit of zero Reynolds number using a boundary integral method, resulting in an accurate evaluation of the flow around fractal objects. We compare a single- and double-layer integral method to compute the velocity, and we determine that the single-layer approach is more suitable to capturing the flow around aggregates. We then characterize the drag of translation flows, the torque of rotational flows, and the straining force of extensional flows acting on aggregates as a function of their size and mode of formation. We determine that the force and torque are best characterized using the gyration radius of the aggregates, and the straining force is better characterized by the maximal radius.

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Phys. Rev. Fluids 5, 044305– Published 23 April, 2020
  • Received 22 November 2019
  • Accepted 1 April 2020
Article part of CHORUS
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