A filter inspired by deep-sea glass sponges for oil cleanup under turbulent flow

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

Oil spill disasters lead to widespread and long-lasting social, economical, environmental ecological impacts. Technical challenges remain for conventional static adsorption due hydrodynamic instability under complex water-flow conditions, which results in low oil-capture efficiency, time delay oil escape. To address this issue, we design a vortex-anchored filter inspired by the anatomy of deep-sea glass sponges (E. aspergillum) mimicking their exceptional skeletal features filter-feeding patterns. Results demonstrate that can retain external turbulent-flow kinetic energy low-speed vortical flow with small Kolmogorov microscale (85 μm) cavity skeleton, leading enhanced interfacial mass transfer residence physical field synergy. It improves stability reducing Reynolds stresses nearly quiescent wake flow. The realize >97% capture floating, underwater emulsified oils stably at numbers ranging from subcritical supercritical regimes. This study not only highlights importance mechanism enhancing during beyond previously known benefits increased time, but also represents paradigm shift advance biophysically strategies in-situ, dynamic robust cleanup spilled oil, remediation resource recovery. authors develop cleaning turbulent flows, structures patterns sponges. could over 97% floating even conditions.

Language: Английский

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Lattice Boltzmann simulations for soft flowing matter

Physics Reports, Journal Year: 2024, Volume and Issue: 1105, P. 1 - 52

Published: Nov. 19, 2024

Language: Английский

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Analysis and removal of spurious pressure oscillations in Boltzmann-equation-based mesoscopic simulation of incompressible turbulence

Journal of Fluid Mechanics, Journal Year: 2025, Volume and Issue: 1005

Published: Feb. 21, 2025

The lattice Boltzmann method has become a popular tool for simulating complex flows, including incompressible turbulent flows; however, as an artificial compressibility method, it can generate spurious pressure oscillations whose impact on the statistics of turbulence not been systematically examined. In this work, we propose theoretical approach to analyse origin compressibility-induced (CIOs) and explore ways suppress or remove them. We begin by decomposing velocity field each into solenoidal component compressive component, then study evolution these two components analytically numerically. analysis yields equation mean-square fluctuation which reveals several coupling effects components. suggests that increasing bulk-to-shear viscosity ratio CIOs, is confirmed numerical simulations. Furthermore, based derived data from simulation, model developed predict long-term behaviours fluctuations. case decaying in periodic domain, show Helmholtz–Hodge decomposition be used obtain reflecting true flow, mesoscopic approach. provides general guidelines understand, even CIOs other related pseudo-compressibility methods.

Language: Английский

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An immersed boundary formulation for lattice Boltzmann simulations of low-Reynolds fluid–structure interaction problems

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

Fluid–solid interaction problems are encountered in various natural phenomena and engineering applications. Specifically, when the fluid passes through a solid body, resultant oscillatory forces may induce structure to vibrate. In this work, immersed boundary formulation has been implemented lattice Boltzmann approach study complex fluid–structure two-dimensional domain. The method used for its capability describe geometries on separate grid with respect one solve motion: Eulerian one, fixed space, domain, Lagrangian which can move freely body motion. main advantage of using is possibility simulate presence applied defining discrete delta function necessary distribute such forces. presented different Reynolds number flow conditions ranging from 20 up 200 starting plain cylinder. validation results cylinder test case demonstrated excellent agreement literature, particularly terms drag lift coefficients Strouhal number. proposed algorithm captures significant high-frequency contributions arising between vortices wake. Applications both cylinder-plate configuration vibrating cases confirmed that based weak coupling be effectively wide range low scenarios.

Language: Английский

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Quasi-linear homogenization for large-inertia laminar transport across permeable membranes

Journal of Fluid Mechanics, Journal Year: 2024, Volume and Issue: 1000

Published: Nov. 27, 2024

Porous membranes are thin solid structures that allow the flow to pass through their tiny openings, called pores. Flow inertia may play a significant role in several filtration flows of natural and engineering interest. Here, we develop predictive macroscopic model describe solvent solute past for non-negligible inertia. We leverage homogenization theory link velocity concentration jumps stress flux across membrane. Within this framework, membrane acts as boundary separating two distinct fluid regions. These jump conditions rely on coefficients, stemming from closure problems at microscopic pore scale. Two approximations advective terms Navier–Stokes advection–diffusion equations introduced include problem. The approximate inertial couple micro- fields. coupling is solved numerically using an iterative fixed-point procedure. compare resulting models against full-scale simulations, with good agreement both averaged values far-field values. Eventually, strategy based unsupervised machine learning improve computational efficiency extension towards weak-inertia configurations well performed data-driven approximation find application preliminary analyses optimization procedures design systems, where effects can be instrumental broadening spectrum permeability selectivity properties these filters.

Language: Английский

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How Water Flows inside a Sea Sponge

Physics, Journal Year: 2024, Volume and Issue: 17

Published: May 16, 2024

How Water Flows inside a Sea SpongeA deep-sea sponge's intricate skeleton converts the horizontal flow of ocean currents into vertical through body-a mechanism that helps with filter feeding.By Charles Day G lass sponges make up class sea inhabit many regions at depths 450 to 900 meters.Anchored seafloor, these draw sustenance from plankton and other organic debris.Because food particles are sparsely distributed, need way filtering them seawater.And method should be efficient lest it consume too much precious energy.Now Giacomo Falcucci University Rome his collaborators have conducted fluid dynamics simulations one species glass sponge, Venus flower basket (Euplectella aspergillum) [1].They found intricately shaped causes seawater passively upward filtration system, reducing metabolic cost extracting food.Glass owe their name star-shaped silica A photograph cluster about dozen in natural habitat, floor.

Language: Английский

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