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Parametric study of the dispersion of inertial ellipsoidal particles in a wave-current flow

Laura K. C. Sunberg1, Michelle H. DiBenedetto2, Nicholas T. Ouellette3, and Jeffrey R. Koseff3

  • 1Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, Colorado 80303, USA
  • 2Department of Mechanical Engineering, University of Washington, Seattle, Washington 98115, USA
  • 3The Bob and Norma Street Environmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, USA

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Phys. Rev. Fluids 9, 034302 – Published 4 March, 2024

DOI: https://doi.org/10.1103/PhysRevFluids.9.034302

Abstract

The degree to which particles such as larvae, seagrass pollen, and microplastics are dispersed by waves and currents influences many ecologically important aspects of their transport and fate. Particle transport models often assume dispersion is simply a function of the local turbulence, but there are many additional parameters related to both the particle characteristics and the flow dynamics that can impact how particles disperse. Here, we perform a parametric study of solutions to the Maxey-Riley equation and Euler's equation for rigid body motion for negatively buoyant, ellipsoidal particles dispersing in a wave-current flow. We systematically examine the impact of a comprehensive set of parameters on particle dispersion: the ratio between the time scales associated with particle settling and the waves, the Archimedes number, the particle eccentricity, the wave steepness, the Keulegan-Carpenter number, and the Stokes number. Our results show that no parameters can be discounted, but that the settling-wave time scale ratio has the largest influence on particle dispersion.

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Phys. Rev. Fluids 9, 034302– Published 4 March, 2024
  • Received 1 May 2023
  • Accepted 25 January 2024
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