Thermosolutal and hydromagnetic performance of radiative hybrid nanofluid in a wavy porous enclosure with a plus-shaped baffle

Journal of Molecular Liquids, Journal Year: 2024, Volume and Issue: 404, P. 124880 - 124880

Published: May 7, 2024

Language: Английский

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Electro-fluid-dynamics (EFD) of soft-bodied organisms swimming through mucus having dilatant, viscous, and pseudo-plastic properties

International Journal of Modern Physics B, Journal Year: 2024, Volume and Issue: unknown

Published: April 30, 2024

The sperm propelling mechanism has been proposed as a possible resource for soft micro-robots in confined spaces, with potential applications biomedical engineering. Human cells essentially swim through the non-Newtonian liquid (cervical mucus) to reach their target. Thus, swimming fluids is not vital only physiology, but also fabrication of micro-robots. Inspired by these remarkable applications, we examine basic mechanics spermatozoa motility using an undulating sheet model. This bounded between two rigid walls which self-propeling negative axial direction. around taken Carreau fluid electro-osmotic properties. application lubrication approximation results reduction momentum equations. resulting ODE solved numerically via finite difference method and MATLAB’s built-in routine bvp5c. unknowns that are present boundary conditions refined root-finding algorithm. Power losses, cell speed, flow rate, velocity fluid, streamline pattern visualized graphs. findings this study have important implications designing optimization electrically controlled microswimmers.

Language: Английский

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Simulation of natural convection of nanofluid inside a square cavity using experimental data by lattice Boltzmann method

Ain Shams Engineering Journal, Journal Year: 2024, Volume and Issue: 15(5), P. 102711 - 102711

Published: Feb. 21, 2024

The Lattice Boltzmann Method (LBM) is one of the suggested numerical approaches that has been shown to accurately estimate increase in heat transfer caused by nanofluids. Several prediction characteristics nanofluids are investigated, and it what degree classical models accurate representations experimental data. first thing was done this study explain thermophysical parameters Ethylene Glycol (EG)-iron nanofluid employed. effect Rayleigh number, volume fraction nanoparticles (φ), cavity angle (θ) on isotherms average Nusselt number (Nuavg) investigated. Finally, adiabatic fin flow demonstrated which scenario vane will be most effective. findings demonstrate raising 105 106 causes transferred under fin. This finding suggests buoyancy force a stronger influence process when carried out close source cold. In general, if increased, rate fluid rise as well. Nu avg increased 44 % Ra from 103 105, 118 106. chances entering cold reduced longer situated lower. There wider zone within hollow Lf = 80 Hf 20, indicating less source.

Language: Английский

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A phase field-immersed boundary-lattice Boltzmann coupling method for fluid-structure interaction analysis

Ocean Engineering, Journal Year: 2024, Volume and Issue: 301, P. 117564 - 117564

Published: March 26, 2024

Language: Английский

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Wake interference effects on flow-induced vibration of flexible membrane wings

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)

Published: July 1, 2024

This work investigates the effect of wake interference on nonlinear coupled dynamics and aerodynamic performance flexible membrane wings at a moderate Reynolds number. A high-fidelity computational aeroelastic framework is employed to simulate flow-induced vibration in response unsteady vortex flows produced by an upstream stationary circular cylinder. The downstream are investigated different gap ratios, numbers, offset distances. variations flow features, responses, frequency characteristics analyzed understand aeroelasticity. results indicate that flight stability degraded under effect. Four distinct regimes classified for cylinder–membrane configuration, namely (i) single body flow, (ii) co-shedding I, (iii) II, (iv) detached vortex-dominated vibration, respectively. mode transition found build new synchronization between its own surrounding flows, or cylinder, adjust vibration. study sheds light aeroelasticity enhances understanding fluid–membrane coupling mechanism. These findings can facilitate development next-generation bio-inspired drones have high efficiency robust gusty flows.

Language: Английский

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A comprehensive assessment of gap spacing in tandem cylinders: Lattice Boltzmann technique based simulations

International Communications in Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: 159, P. 108153 - 108153

Published: Oct. 7, 2024

Language: Английский

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Collision and clustering behavior of high-viscosity fluid-particle flow in bent pipes based on LBM-DEM

Ocean Engineering, Journal Year: 2025, Volume and Issue: 320, P. 120283 - 120283

Published: Jan. 11, 2025

Language: Английский

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A Numerical Framework for Fast Transient Compressible Flows Using Lattice Boltzmann and Immersed Boundary Methods

International Journal for Numerical Methods in Engineering, Journal Year: 2025, Volume and Issue: 126(3)

Published: Feb. 7, 2025

ABSTRACT This article is dedicated to the development of a model simulate fast transient compressible flows on solid structures using immersed boundary method (IBM) and lattice Boltzmann solver. Ultimately, proposed aims at providing an efficient algorithm strongly‐coupled fluid‐structure interactions (FSI). Within this goal, it necessary propose precise robust numerical framework validate stationary cases first, which scope present study. Classical FSI methods, such as body‐fitted approaches, are facing challenges with moving or complex geometries in realistic conditions, requiring computationally expensive re‐meshing operations. IBM offers alternative by treating structure geometry independently from fluid mesh. study focuses extension flows, particular attention given enforcement various thermal conditions. A hybrid approach, combining diffuse forcing for Dirichlet‐type conditions ghost‐nodes Neumann‐type introduced. Finally, simplified model, relying only forcing, investigated treat specific where interface considered adiabatic. The accuracy validated through test increasing complexity.

Language: Английский

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Control of flow dynamics around a cylinder using sweeping jets

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

Published: March 1, 2025

Flow control of cylinders aimed at drag reduction or vibration suppression has been widely studied. Sweeping jet is a novel flow method that applied to airfoil and other bluff bodies. This paper numerically investigates the effects sweeping jets on cylinder Reynolds number 5 × 104 using large Eddy simulation. Various parameters such as angle, momentum coefficient, arrangement configuration fluidic oscillators are examined for their influence effectiveness. The results demonstrate significantly reduce cylinder's drag, mitigate lift fluctuations, suppress vortex shedding, extend length recirculation region. optimal angle 70°, coefficient 3.4 10−3, reaches maximum 47%, while standard deviation decreases by 92.2%. As increases, factor (defined ratio reduced baseline drag) rises. However, when exceeds 10-3, rate significantly, accompanied changes in wake pattern. Besides, density also plays crucial role Furthermore, interaction between incoming examined. upstream separation point exchange with boundary layer, enhancing stability suppressing separation. closer point, more effective suppression.

Language: Английский

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Numerical study of gas–solid transport characteristics within vortex region induced by porous media using lattice-Boltzmann based discrete particle simulation

Powder Technology, Journal Year: 2024, Volume and Issue: 434, P. 119336 - 119336

Published: Jan. 2, 2024

Language: Английский

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