Flow control of two tandem cylinders by a highly flexible filament: Lattice spring IB-LBM

Ocean Engineering, Journal Year: 2022, Volume and Issue: 250, P. 111025 - 111025

Published: March 9, 2022

Language: Английский

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Analysis of power law fluid-structure interaction in an open trapezoidal cavity

International Journal of Mechanical Sciences, Journal Year: 2020, Volume and Issue: 174, P. 105481 - 105481

Published: Jan. 28, 2020

Language: Английский

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Fluid-structure interaction of bio-inspired flexible slender structures: a review of selected topics

Bioinspiration & Biomimetics, Journal Year: 2022, Volume and Issue: 17(4), P. 041002 - 041002

Published: April 20, 2022

Flexible slender structures are ubiquitous in biological systems and engineering applications. Fluid-structure interaction (FSI) plays a key role the dynamics of such immersed fluids. Here, we survey recent studies on highly simplified bio-inspired models (either mathematical or mechanical) that aim to revealthe flow physics associated with FSI. Various from different sources inspiration included, namely flexible flapping foil inspired by fish insects, deformable membrane jellyfish cephalopods, beating filaments flagella cilia microorganisms, wall-mounted terrestrial aquatic plants. Suggestions directions for future research also provided.

Language: Английский

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Fluid-Elastic Interactions Near Contact at Low Reynolds Number

Annual Review of Fluid Mechanics, Journal Year: 2023, Volume and Issue: 56(1), P. 491 - 519

Published: Oct. 10, 2023

Interactions between fluid flow and elastic structures are important in many naturally occurring engineered systems. This review collects organizes recent theoretical experimental developments understanding fluid-structure interactions at low Reynolds numbers. Particular attention is given to the motion of objects moving close proximity deformable soft materials ensuing interplay deformation. We discuss how this can be understood terms forces torques, harnessed applications such as microrheometry, tribology, robotics. then interaction wet contact, where intermolecular surface roughness effects become sources complexity opportunity.

Language: Английский

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Influence of small inertia on Jeffery orbits

Journal of Fluid Mechanics, Journal Year: 2024, Volume and Issue: 979

Published: Jan. 19, 2024

We experimentally investigate the rotational dynamics of neutrally buoyant axisymmetric particles in a simple shear flow. A custom-built shearing cell and multi-view shape-reconstruction method are used to obtain direct measurements orientation period rotation having oblate prolate shapes (such as spheroids cylinders) varying aspect ratios. By systematically changing viscosity fluid, we examine effect inertia (which may be originated from either phase) on dynamical behaviour these suspended up particle Reynolds number approximately one. While no significant is found this small-inertia regime, systematic drift among several rotations toward limiting stable orbits observed. Prolate seen towards tumbling orbit plane shear, whereas driven or vorticity-aligned spinning orbits, depending their initial orientation. These results compared with recent asymptotic theories, assessing range validity, well numerical simulations regime for both particles.

Language: Английский

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Chirality-induced bacterial rheotaxis in bulk shear flows

Science Advances, Journal Year: 2020, Volume and Issue: 6(28)

Published: July 10, 2020

Interaction of swimming bacteria with flows controls their ability to explore complex environments, crucial many societal and environmental challenges relevant for microfluidic applications as cell sorting. Combining experimental, numerical theoretical analysis, we present a comprehensive study the transport motile in shear flows. Experimentally, obtain high accuracy large range flow rates, spatially resolved velocity orientation distributions. They are excellent agreement simulations kinematic model accounting stochastic microhydrodynamic properties particular flagella chirality. Theoretical analysis reveals scaling laws behind average rheotactic at moderate rates using chirality parameter explains reorientation dynamics leading saturation from marginal stability fixed point. Our findings constitute full understanding physical mechanisms parameters bulk rheotaxis.

Language: Английский

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A Review of Computational Models for the Flow of Milled Biomass Part I: Discrete-Particle Models

ACS Sustainable Chemistry & Engineering, Journal Year: 2020, Volume and Issue: 8(16), P. 6142 - 6156

Published: April 3, 2020

Biomass is a renewable and sustainable energy resource. Current design of biomass handling feeding equipment leverage both experiments numerical modeling. This paper reviews the state-of-the-art discrete element methods (DEM) for flow milled (Part I), accompanied by comprehensive review on continuum-based computational models II). The present DEM primarily focused features suitability various particle shape different types because predominant attribute controlling behavior complex-shaped granular material. general strengths weaknesses in applicability those modeling are summarized. In particular, comments provided to balance model capabilities cost development models. To our best knowledge, this first-of-its-kind specifically biomass. Our study indicates that current require further development, calibration, validation based deep understanding contact mechanics experimental data support before they can be reliably used predictive simulations systems.

Language: Английский

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Self-organized swimming with odd elasticity

Physical review. E, Journal Year: 2022, Volume and Issue: 105(6)

Published: June 6, 2022

We theoretically investigate self-oscillating waves of an active material, which were recently introduced as a nonsymmetric part the elastic moduli, termed odd elasticity. Using Purcell's three-link swimmer model, we reveal that odd-elastic filament at low Reynolds number can swim in self-organized manner and time-periodic dynamics are characterized by stable limit cycle generated elastohydrodynamic interactions. Also, consider noisy shape gait derive swimming formula for general material Stokes regime with its elasticity modulus being represented matrix, demonstrating produces biased net locomotion from random noise.

Language: Английский

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Jeffery’s Orbits and Microswimmers in Flows: A Theoretical Review

Journal of the Physical Society of Japan, Journal Year: 2023, Volume and Issue: 92(6)

Published: May 17, 2023

In this review, we provide a theoretical introduction to Jeffery's equations for the orientation dynamics of an axisymmetric object in flow at low Reynolds number, and review recent extensions applications motions self-propelled particles, so-called microswimmers, external flows. Bacteria colonize human organs medical devices even with flowing fluid, microalgae occasionally cause huge harmful toxic blooms lakes oceans, artificial microrobots can migrate flows generated well-designed microfluidic chambers. The Jeffery equations, simple set ordinary differential equation, useful building block modeling, analyzing, understanding these microswimmer current, particular when incorporating impact swimmer shape since contain parameter as single scalar, known Bretherton parameter. particle forms closed orbit situated shear, non-uniform periodic rotational motion, referred orbits, is due constant motion non-linear equation. After providing hydrodynamics derivation discuss possible more general shapes, including those rapid deformation. latter part mathematical models microswimmers different types fields are described, focus on constants their relation phase space, together breakdown degenerate stable, unstable, chaotic system. discussion paper will comprehensive foundation orbits be understand under various

Language: Английский

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Nonlinear oscillatory rheology of aqueous suspensions of cellulose nanocrystals and nanofibrils

Journal of Rheology, Journal Year: 2024, Volume and Issue: 68(4), P. 491 - 508

Published: May 16, 2024

In this work, the nonlinear rheological behavior of aqueous suspensions composed two typical nanocellulose [rod-like cellulose nanocrystals (CNCs) and filamentous nanofibrils (CNFs)] was examined compared by using various large-amplitude oscillatory shear (LAOS) analysis methods, such as Fourier-transform rheology, stress decomposition, Chebyshev polynomials, sequence physical processes. From our analysis, parameters higher harmonics, dissipation ratio, strain hardening thickening transient modulus, cage modulus were obtained quantitatively analyzed. CNCs tend to assemble form anisotropic structures in an medium while CNFs are entangled gels. The CNF demonstrated a significant viscous overshoot had stronger yield stresses, but CNC more ductile. case low concentrations, intracycle medium-amplitude region lower ratios at small amplitudes. Although both revealed existence four transition processes (viscoplastic deformation, structural recovery, early-stage yielding, late-stage yielding), exhibited recovery ability. Larger amplitudes did not invariably result broader range transitions, which also affected excitation frequency. application LAOS methods provided valuable insights into suspensions, great importance for enhancing their industrial perspectives.

Language: Английский

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