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Drag and lift forces on a rigid sphere immersed in a wall-bounded linear shear flow

Pengyu Shi1,2, Roland Rzehak1, Dirk Lucas1, and Jacques Magnaudet3,*

  • 1Helmholtz-Zentrum Dresden–Rossendorf, Institute of Fluid Dynamics, Bautzner Landstrasse 400, D-01328 Dresden, Germany
  • 2Technische Universität Dresden, Faculty of Mechanical Engineering, Institute of Power Engineering, D-01062 Dresden, Germany
  • 3Institut de Mécanique des Fluides de Toulouse (IMFT), Université de Toulouse, CNRS, 31400 Toulouse, France

  • *Corresponding author: jmagnaud@imft.fr
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Phys. Rev. Fluids 6, 104309 – Published 28 October, 2021

DOI: https://doi.org/10.1103/PhysRevFluids.6.104309

Abstract

We report on a series of fully resolved simulations of the flow around a rigid sphere translating steadily near a wall, either in a fluid at rest or in the presence of a uniform shear. Nonrotating and freely rotating spheres subject to a torque-free condition are both considered to evaluate the importance of spin-induced effects. The separation distance between the sphere and wall is varied from values at which the wall influence is weak down to gaps of half the sphere radius. The Reynolds number based on the sphere diameter and relative velocity with respect to the ambient fluid spans the range 0.1–250, and the relative shear rate defined as the ratio of the shear-induced velocity variation across the sphere to the relative velocity is varied from −0.5 to +0.5, so that the sphere either leads the fluid or lags behind it. The wall-induced interaction mechanisms at play in the various flow regimes are analyzed qualitatively by examining the flow structure, especially the spanwise and streamwise vorticity distributions. Variations of the drag and lift forces at low-but-finite and moderate Reynolds number are compared with available analytical and semiempirical expressions, respectively. In more inertial regimes, empirical expressions for the two force components are derived based on the numerical data, yielding accurate fits valid over a wide range of Reynolds number and wall-sphere separations for both nonrotating and torque-free spheres.

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References (49)

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Outline

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Phys. Rev. Fluids 6, 104309– Published 28 October, 2021
  • Received 16 August 2021
  • Accepted 13 October 2021
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