Investigating the effect of finite ionic size and solvent polarization on induced charge electro-osmosis around a perfectly polarizable cylinder DOI
Arka Das, Aditya Bandopadhyay

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(11)

Published: Nov. 1, 2024

Many industrially relevant microfluidic applications use concentrated solutions of macro-molecular solutes dissolved in polar solvents like water, which are typically deployed at high voltages. In this study, we investigate the effect finite ionic sizes and solvent polarization on induced charge electro-osmotic flow around a perfectly polarizable cylinder, electric field strengths concentrations. The is actuated by means direct current field, step response various parameters studied numerically. Finite sizes, defined through steric factor ν, modeled using modified Poisson–Nernst–Planck model. Additionally, field-dependent permittivity, characterized number A, accounts for molecular re-orientation effects. Our findings reveal an ion-size modulated decrement concentration electrical double layer augmentation field. Remarkably, resulting velocities increase with ion size. Solvent polarization, other hand, results marked reduction velocities. Steric effects, however, dominate over large range parameter space (applied voltage bulk concentration) as compared to polarization. Finally, demonstrate that unequal result asymmetries steady-state, thereby generating net electro-phoretic motion suspended particles.

Language: Английский

Computational fluid–structure interaction in biology and soft robots: A review DOI
R. Pramanik, Roel Verstappen, Patrick R. Onck

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

The omnipresence of fluid–structure interaction (FSI) in biological systems is indisputable—from the vibration leaves to locomotion fish, flying birds, and cardiovascular biomechanics; FSI indeed ubiquitous. Even stimuli-responsive soft robots that typically operate inside a fluid medium, these physical interactions are prevalent. Therefore, it becomes mandatory have thorough understanding their fully coupled physics involving strong two-way between solid domains. Although state-of-the-art computational frameworks robust numerical techniques been developed study complex mechanisms associated nonlinearities multiple spatiotemporal scales, we believe timely review current development, emerging techniques, future challenges would further stimulate research along this direction. explore broad landscape myriad avenues herald emphasizing manifold occurrences biology advanced robotic technologies, while underlining plethora adopted fundamental phenomena.

Language: Английский

Citations

5
A partitioned based algorithm for cohesive crack simulations subjected to fluid–structure interaction effects DOI
Gong Chen, Zhen Yue,

Yifang Qin

et al.

Ocean Engineering, Journal Year: 2025, Volume and Issue: 322, P. 120528 - 120528

Published: Feb. 4, 2025

Language: Английский

Citations

0
A CFD-FEM-IBM simulation scheme for the strong coupling between the fluid and the structure with large deformations and movements DOI

Jia Mao,

Li Feng, Shuhe Wang

et al.

Computers & Structures, Journal Year: 2025, Volume and Issue: 310, P. 107673 - 107673

Published: Feb. 18, 2025

Language: Английский

Citations

0
The Cahn–Hilliard–Navier–Stokes framework for multiphase fluid flows: laminar, turbulent and active DOI
Nadia Bihari Padhan, Rahul Pandit

Journal of Fluid Mechanics, Journal Year: 2025, Volume and Issue: 1010

Published: May 5, 2025

The Cahn–Hilliard–Navier–Stokes (CHNS) partial differential equations (PDEs) provide a powerful framework for the study of statistical mechanics and fluid dynamics multiphase fluids. We an introduction to equilibrium non-equilibrium systems in which coexisting phases, distinguished from each other by scalar order parameters, are separated interface. then introduce coupled CHNS PDEs two immiscible fluids generalisations (i) phases with different viscosities, (ii) gravity, (iii) three-component (iv) active discuss mathematical issues regularity solutions PDEs. Finally we survey rich variety results that have been obtained numerical studies CHNS-type diverse systems, including bubbles turbulent flows, antibubbles, droplet liquid-lens mergers, turbulence active-CHNS model its generalisation can lead self-propelled droplet.

Language: Английский

Citations

0
Exploring the Role of Filaments in Channel Flow Modification Using the Immersed Boundary Lattice Boltzmann Method DOI
Hamid Hassanzadeh Afrouzi,

Saeid Shiri,

Mohsen Hassani

et al.

Flow Measurement and Instrumentation, Journal Year: 2025, Volume and Issue: unknown, P. 102952 - 102952

Published: June 1, 2025

Language: Английский

Citations

0
Experimental and numerical investigations to the aeroelastic response of flexible thin airfoil DOI
H. M. Shang, Zhuo Wang, Lin Du

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(6)

Published: June 1, 2024

The paper investigates the phenomenon of aeroelastic response flexible thin airfoils under various angles attack (AOAs) and flow velocities through wind tunnel experiments numerical simulations. vibration modal characteristics are explored, including frequencies, amplitudes, transition, instantaneous characteristics. Vibration is directly measured using non-contact laser sensors, model appropriately configured to simulate fluid–structure interaction (FSI) problem large deformation. Experiments cover a range AOAs (1°–20°) incoming (from 10 73 m/s), with dynamic responses four sensors. Both average features analyzed, revealing multi-modal as velocity AOA increase. mode transitions from pure bending higher-order modes increases. Specifically, at higher increased AOA, high-order component shifts bending-torsional coupled pure-torsional mode. Comparison frequencies between experimental measurements finite element method simulations highlights significant shifts, particularly in Furthermore, employing commercial software ANSYS CFX Mechanical, two-way three-dimensional FSI successfully replicates flutter boundaries observed experimentally 1° approximately m/s. This extended vibrations 15° yielding insights into phenomena contributing this AOA. An explanation provided for based on above insight. Finally, differences speculated upon.

Language: Английский

Citations

2
Influence of wall thickness on the rupture risk of a patient-specific cerebral aneurysm: A fluid–structure interaction study DOI

Chanikya Valeti,

Srinivas Bolem, Azhaganmaadevi K. Alagan

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(9)

Published: Sept. 1, 2024

Cerebral aneurysms are the bulges in arteries that have potential to rupture, as thin-walled regions of an aneurysm more vulnerable. Understanding correlation between wall thickness and corresponding stresses can facilitate better prediction using fluid–structure interaction tools. However, obtaining actual vivo variation dome neck is vital for accurate stresses. Invasive methods abnormal artery may further aggravate rupture risk these aneurysms. Modeling aneurysmal reconstruction, closer conditions from histopathological slices, apt approach follow. To this end, present study performs a comparative assessment uniform, variable, patient-specific on hemodynamic biomechanical Simulations show maximum 13.6, 27.6, 48.4 kPa, respectively. The displacements were observed be 58.5, 126, 162 μm, It uniform model conservative underestimates displacements. Thinner experience higher stress same internal pressure than thicker regions, indicating susceptible rupture. generation variable was approach, information only retrospective current scientific scenario.

Language: Английский

Citations

2
Flow topology and mixing in alveolar edema: Unsteady flow in interconnected cavities with moving walls DOI
Jun Dong,

Huimin Lv,

Chengyue Wang

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

The study of alveolar fluid mechanics is critical for comprehending respiratory function and lung diseases, particularly in cases lesions that result significant structural dynamic changes. This investigates the flow topology chaotic mixing within both normal edematous alveoli, where alveoli model are interconnected by pores. To numerically simulate flow, a mathematical developed to ascertain key parameters Reynolds number (Re) expansion ratio. Subsequently, fields analyzed determine wall shear stress (WSS) identify WSS points velocity vector, with thorough presentation various topologies corresponding these points. Moreover, mode decomposition-based method introduced track particle trajectories, exploration conducted through tracer advection, Poincare map, calculation finite-time Lyapunov exponents. Results indicate exhibits higher Re due properties. Within high usually localized at pores increase alter topologies, significantly changing mixing. Additionally, locations also affect patterns. These findings crucial understanding physiology designing inhaled drugs considering role chaos transport acini.

Language: Английский

Citations

0
Investigating the effect of finite ionic size and solvent polarization on induced charge electro-osmosis around a perfectly polarizable cylinder DOI
Arka Das, Aditya Bandopadhyay

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(11)

Published: Nov. 1, 2024

Many industrially relevant microfluidic applications use concentrated solutions of macro-molecular solutes dissolved in polar solvents like water, which are typically deployed at high voltages. In this study, we investigate the effect finite ionic sizes and solvent polarization on induced charge electro-osmotic flow around a perfectly polarizable cylinder, electric field strengths concentrations. The is actuated by means direct current field, step response various parameters studied numerically. Finite sizes, defined through steric factor ν, modeled using modified Poisson–Nernst–Planck model. Additionally, field-dependent permittivity, characterized number A, accounts for molecular re-orientation effects. Our findings reveal an ion-size modulated decrement concentration electrical double layer augmentation field. Remarkably, resulting velocities increase with ion size. Solvent polarization, other hand, results marked reduction velocities. Steric effects, however, dominate over large range parameter space (applied voltage bulk concentration) as compared to polarization. Finally, demonstrate that unequal result asymmetries steady-state, thereby generating net electro-phoretic motion suspended particles.

Language: Английский

Citations

0