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arXiv:2410.12152 (physics)
[Submitted on 16 Oct 2024]

Title:Fluid Dynamics and Passive Scalar Transport Driven by Non-Uniform Tumbling of a Prolate Spheroid in Simple Shear Flow

Authors:Yanxing Wang, Hui Wan, Tie Wei, Fangjun Shu
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Abstract:Using high-fidelity numerical simulations based on a lattice Boltzmann framework, the advection-enhanced transport of a passive scalar from a prolate spheroid in simple shear flow has been thoroughly investigated across various parameters, including the spheroid's aspect ratio, particle-to-fluid density ratio, Reynolds number, and Schmidt number. The Reynolds number is constrained to the range from 0 to 1, where the prolate spheroid tumbles around its minor axis, aligned with the vorticity axis, in an equilibrium state. Several key findings have emerged: 1) Particle inertia significantly influences the uniformity of the spheroid's tumbling, affecting flow patterns around the spheroid and, consequently, the modes of scalar transport; 2) Both uniform and non-uniform tumbling generate a scalar line in the fluid with elevated scalar concentration, which sweeps through the wake region and merges with clusters of previously formed scalar lines; 3) Fluid passing over the spheroid carries the passive scalar downstream along these scalar lines; 4) Variations in the uniformity of spheroid tumbling result in distinct flow patterns and scalar transport modes, leading to different transport rates; 5) Within the studied parameter ranges, increased particle inertia enhances the scalar transport rate; 6) When both fluid and particle inertia are minimal, the dimensionless scalar transport rate for different aspect ratios converges to a common dependence on the Peclet number. These phenomena are analyzed in detail.
Subjects: Fluid Dynamics (physics.flu-dyn)
Cite as: arXiv:2410.12152 [physics.flu-dyn]
  (or arXiv:2410.12152v1 [physics.flu-dyn] for this version)
  https://doi.org/10.48550/arXiv.2410.12152
arXiv-issued DOI via DataCite
Journal reference: J. Fluid Mech. 1021 (2025) A11
Related DOI: https://doi.org/10.1017/jfm.2025.10689
DOI(s) linking to related resources

Submission history

From: Yanxing Wang [view email]
[v1] Wed, 16 Oct 2024 01:20:30 UTC (4,021 KB)
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