Fluid Dynamics - Science topic

This research investigates a multiphase fluid system involving water, air and its influence and behaviour of the thin aluminium foil which undergoes deformation encompassing in fluid structure interacting study. The study employs a three-dimensional numerical model developed using COMSOL Multiphysics (version 6.2), utilizing the Arbitrary Lagrangia...

This study examines the application of Computational Fluid Dynamics (CFD) in the analysis of a stepped channel. The primary objective of this research is to explore the behavior of fluid flow and the influence of stair geometry on the hydraulic properties and fluid dynamics within the channel. Utilizing CFD software, comprehensive simulations were...

Particle Image Velocimetry (PIV) is an established versatile and reliable tool for flow measurements. This technique enables the instantaneous capture of velocity fields in both 2D and 3D domains across multiple points simultaneously, facilitating the measurement of quantities like vorticity and strain. Its application spans a broad range in fluid...

Normal blood flow is disrupted by aortic stenosis, which raises risks and affects the cardio-vascular system. This work analyzes blood viscosity from the central core line to the arterial wall in order to look at flow parameters in arteries with minor stenosis. In order to account for effective viscosity at radial distances, fluid dynamics in axisy...

Partial differential equations (PDEs) are mathematical equations that are used to model physical phenomena around us, such as fluid dynamics, electrodynamics, general relativity, electrostatics, and diffusion. However, solving these equations can be challenging due to the problem known as the dimensionality curse, which makes classical numerical me...

The stochastic nonlinear Kodama (SNLK) equation forced in the Stratonovich sense by multiplicative noise is considered here. New elliptic, hyperbolic, trigonometric, and rational stochastic solutions are acquired using (G′/G)-expansion method and mapping method. Because the SNLK equation is extensively used in is extensively used in nonlinear optic...

Ensuring the stability of anchors is essential for the safety and longevity of structures in offshore and onshore projects. Grouting into soil is a promising approach to improving the load-bearing capacity of the anchors. However, identifying a suitable numerical model and conducting laboratory tests for grouting models pose significant challenges...

The interaction of non-thermal atmospheric pressure plasmas and targets of various properties is an interdisciplinary area of growing interest. The understanding of the interaction mechanisms between a cold atmospheric pressure plasma and the surface of a liquid or a solid target, as well as the modifications induced inside the target, requires in...

Eddy-resolving turbulence simulations are essential for understanding and controlling complex unsteady fluid dynamics, with significant implications for engineering and scientific applications. Traditional numerical methods, such as direct numerical simulations (DNS) and large eddy simulations (LES), provide high accuracy but face severe computatio...

Fingering instability, a pivotal phenomenon in multiphase flow within porous media, is thoroughly examined. It stems from the interplay of capillary and viscous forces, yielding distinctive finger-like patterns, and holds critical implications for oil recovery and environmental remediation. A comprehensive mathematical model, fortified by the Metho...

Images of compressible flows can be post-processed with digital imaging techniques to obtain accurate quantitative information about variables characterizing the flow. For example, the local flow Mach number can be obtained from the angle of Mach lines visualized with the schlieren method. These techniques were recently applied to supersonic flows...

The spectral theory of operator matrices has several applications in elasticity, quantum mechanics, fluid dynamics, and other fields of mathematical physics. The study of operator matrices is more challenging when the involved operators are not single-valued and should be studied in the context of the theory of relations. In this paper, we utilize...

The stability and behavior of jet flows are critical in various engineering applications, yet many aspects remain insufficiently understood. Previous studies predominantly relied on modal methods to describe small perturbations on jet flow surfaces through the linear superposition of modal waves. However, these approaches largely neglected the inte...

The thermal conductivity of nanofluids (NFs) has emerged as a critical area of research due to its potential to enhance heat transfer in various industrial applications. Non-Newtonian NFs, in particular, exhibit unique flow characteristics under the influence of magnetic fields, making them suitable for systems requiring precise control of fluid dy...

En el estudio se comparó el tiempo de vaciado de un recipiente cónico truncado, en función de la viscosidad de cuatro líquidos utilizados en la industria mecánica: aceite para motor (SAE 15W40 y SAE 50), aceite hidráulico (ISO 68) y agua; a partir de ensayos manuales realizados sobre el equipo y el modelo teórico deducido de los principios de la di...

Water scarcity is one of 21st century’s most pressing global issues. The anthropogenic pressure and climate change will be the main drivers of freshwater depletion in the coming decades. According to the FAO, the amount of water needed to support all human activities will be 20–30% higher by 2050. A closer look reveals how agriculture is a major co...

We introduce recurrent all-pairs field transforms for stereoscopic particle image velocimetry (RAFT-StereoPIV). Our approach leverages deep optical flow learning to analyze time-resolved and double-frame particle images from on-site measurements, particularly from the ‘Ring of Fire,’ as well as from wind tunnel measurements for fast aerodynamic ana...

Multiscale modeling plays a crucial role in understanding complex phenomena across different spatial and temporal scales. Traditional approaches often rely on integer-order differential equations, which may not accurately capture the memory effects, hereditary behavior, or anomalous diffusion observed in many natural systems. Fractional calculus, w...

The marine environment is highly complex and variable, featuring obstacles such as islands, buoys, and vessels. Safe navigation of the surface agent (SA) fleet is crucial for ensuring the safety of the SA fleet, enhancing operational efficiency, and guaranteeing the smooth execution of the fleet’s mission. Regarding the problem of formation obstacl...

Computational models that predict melt pool shapes and temperature evolution in laser-based powder bed fusion of metals (PBF-LB/M) can range from simple thermal simulation models to more advanced models that incorporate more detailed physics of the process. While advanced models can accurately predict thermal fields and melt pool fluid dynamics, th...

In cold spray, successful bonding occurs when particle impact velocities exceed the critical velocity. The description of the critical velocity includes temperature upon impact and material properties, relying on tabulated data of bulk material. However, rapid solidification of powder particles during gas atomization results in higher strengths tha...

General relativistic radiative transfer calculations are essential for comparing theoretical models of black hole accretion flows and jets with observational data. In this work, we introduce Coport,[The public version of Coport is available at the following URL: https://github.com/JieweiHuang/Coport.] a novel public code specifically designed for c...

The Crabster CR200 is an underwater walking robot inspired by crabs and lobsters, designed for precise seabed inspection and manipulation. It maintains stability and position on the seafloor, even in strong currents, by adjusting its posture through six legs, each with four degrees of freedom. The key advantage of the CR200 lies in its ability to r...

Este proyecto tiene como objetivo demostrar el Efecto Venturi, un principio fundamental de la dinámica de fluidos que describe cómo un fluido acelera al pasar por una sección estrecha de una tubería, lo que genera una disminución en la presión.

This study explores the dynamics of heat and mass transfer in a vertical channel using immiscible micropolar and viscous fluids with variable viscosity and thermal conductivity, while also examining the effects of multiple slip phenomena. Mathematica ND solve software uses the Runge-Kutta 6th order method to solve and analyze the system of equation...

Dynamic mode decomposition (DMD) effectively captures the growth and frequency characteristics of individual modes, enabling the construction of reduced-order models for flow evolution, thereby facilitating the prediction of fluid dynamic behavior. However, DMD's predictive accuracy is inherently constrained by its inability to inherently incorpora...

Solar thermal systems, especially in district heating networks, are crucial to achieving climate neutrality in Germany's heat supply by 2045. The joint project HYDRA RoS, funded by the Federal Ministry for Economic Affairs and Climate Protection (Germany), focuses on the development of high-efficiency solar thermal collector concepts for series pro...

This paper presents a novel hybrid approach that integrates computational fluid dynamics (CFD), physics-informed neural networks (PINN), and fluid–structure interaction (FSI) methods to simulate fluid flow in stenotic coronary artery trees and predict fractional flow reserve (FFR) in areas of stenosis. The primary objective is to utilize a 1D PINN...

Physics-informed neural networks (PINNs) have emerged as a promising approach for simulating nonlinear physical systems, particularly in the field of fluid dynamics and turbulence modelling. Traditional turbulence models often rely on simplifying assumptions or closed numerical models, which simplify the flow, leading to inaccurate flow predictions...

The heat transfer of fluid can be greatly enhanced by natural convection, leading to the famous Nusselt-Rayleigh number scaling that has been a focus of modern fluid dynamics. Our work explores natural convection in an annular domain, where the annular geometry reinforces the large-scale circulation. To understand the heat transfer and flow pattern...

Navier-Stokes and Maxwell equations have been invented for fluid dynamics and electromagnetic systems, respectively, for centuries. The development of Navier-Stokes and Maxwell equations for homogeneous materials seems to be mature. However, when there is a phase interface, a coupling theory for the mass transport with the propagation of electromag...

Calcium-Magnesium-Alumino-Silicate (CMAS) is a category of atmospheric debris in the form of dirt, sand, and ash that damage thermal barrier coatings (TBC) in aircraft engines. The damage is not a direct result of erosion, but rather, CMAS melts in engines and impacts the TBCs. In this state, the CMAS can infiltrate the TBC microstructure which lea...

In this article, we mainly study new soliton solutions of the conformable time fractional Drinfel’d–Sokolov–Wilson (DSW) equation which has applications in a wide range of practical applications, including fluid dynamics problems. After fractional order travelling transformation, the partial differential equation studied in this article is transfor...

Nowadays, numerical simulation, such as computational fluid dynamics (CFD), has become an essential tool for scientific investigation and analysis of complex systems in engineering allowing high-fidelity Navier-Stokes resolution for realistic turbulent flows which cannot be solved analytically. However, although all the studies and development cond...

Background This study experimentally and numerically addresses magnetohydrodynamic forced convection including dimpled fins, Fe3O4/water ferrofluid, and DC magnetic field. In this research, focusing on the thermo-hydraulic performance improvement of a sudden expansion tube. It has been used different inlet diameters, dimple sizes, ferro nanoparticl...

Co-adjoint orbit actions, which are the examples par excellence of geometric quantization, are used to set up a group-theoretic formulation of fluid dynamics. The role of Clebsch variables is also outlined. Some features of nonabelian magnetohydrodynamics, relativistic fluids with spin, anomalous symmetries in fluids and the chiral magnetic effect...

In recent years, hierarchically porous polymer membranes (HPPMs) have emerged as promising materials for a wide range of applications, including filtration, separation, and energy storage. These membranes are distinguished by their multiscale porous structures, comprising macro-, meso-, and micropores. The multiscale structure enables optimizing th...

Two-phase flow phenomena play a key role in many engineering applications, including hydrogen fuel cells, spray cooling techniques and combustion. Specialized techniques like shadowgraphy and particle image velocimetry can reveal gas-liquid interface evolution and internal velocity fields; however, they are largely limited to planar measurements, w...

In-Context Operator Networks (ICONs) are models that learn operators across different types of PDEs using a few-shot, in-context approach. Although they show successful generalization to various PDEs, existing methods treat each data point as a single token, and suffer from computational inefficiency when processing dense data, limiting their appli...

Creating realistic droplet simulations and animations has long been a formidable challenge for researchers and developers due to the inherent complexity of fluid dynamics. Achieving lifelike droplet splash simulations while managing computational resources has often resulted in sacrifices compromising the realism of visualizations. Nevertheless, si...

Microalgae serve as a valuable biological resource in many industrial applications. Thus, it is essential to obtain a high-efficiency separation technique for microalgae precisely. In this study, a runway-shaped microchannel with ordered semicircular micro-obstacles was introduced to conduct the separation of microalgae with different sizes. The ru...

This paper is associated with a poster winner of a 2023 American Physical Society Division of Fluid Dynamics (DFD) Milton Van Dyke Award for the work presented at the DFD Gallery of Fluid Motion. The original poster is available online at the Gallery of Fluid Motion, . Published by the American Physical Society 2024

This paper presents an innovative framework for analyzing the regularity of solutions to the stochastic Navier-Stokes equations by integrating Sobolev-Besov hybrid spaces with fractional operators and quantum-inspired dynamics. We propose new regularity theorems that address the multiscale and chaotic nature of fluid flows, offering novel insights...

The widely used Darcy’s law specifies a linear relation between the Darcy velocity of fluid flow and the pressure gradient that drives the flow. However, studies have shown that Darcy velocity can exhibit a nonlinear dependence on the pressure gradient in low-permeability porous media such as clay and shale when the pressure gradient is adequately...

This study investigated the ability of artificial neural networks (ANNs) to resolve the nonlinear dynamics inherent in the behavior of complex fluid flows, which often exhibit multifaceted characteristics that challenge traditional analytical or numerical methods. By employing flow profile pairs that are generated through high-fidelity numerical si...

Based on the Jacobi polynomial expansion, an arbitrary high-order Discontinuous Galerkin solver for compressible flows on unstructured meshes is proposed in the present work. First, we construct orthogonal polynomials for 2D and 3D isoparametric elements using the 1D Jacobi polynomials. We perform modal expansions of the state variables using the o...

This paper is associated with a poster winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available online at the Gallery of Fluid Motion, Published by the American Physical Society 2024

Tungsten-bearing garnet is an important reservoir of W in oxidized W skarns. However, the degree to which W is remobilized from garnet into scheelite is unknown. In addition, differences between W skarns and Cu and Pb-Zn skarn fluids are poorly characterized. This study focuses on these issues and presents new backscattered electron (BSE) imaging,...

This paper is associated with a video winner of a 2023 American Physical Society's Division of Fluids Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, Published by the American Physical Society 2024

This paper is associated with a video winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, . Published by the American Physical Society 2024

This paper is associated with a video winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, Published by the American Physical Society 2024

This paper is associated with a video winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, marker GFM. Published by the American Physical Society 2024

Soliton solutions play a crucial role in modeling stable phenomena across optical communications, fluid dynamics, and plasma physics, owing to their stability and persistence in solving nonlinear equations. This study centers on the extended Sakovich equation, emphasizing the importance of soliton solutions in predicting and controlling localized w...

Coupled hyperelastic balloons that anchor alternately against a lumen wall provide an appealing locomotion method for soft robots, especially for pipe inspection and medical interventions. However, it is still challenging to use a single fluid channel to obtain a practical balloon actuation sequence, where the rear anchor is both the first to infla...

The motion of a bubble of negligible viscosity, such as air, forced down a tube filled with a viscous fluid which wets the walls of the tube has become a classic of the fluid dynamical literature. The differential motion of the bubble and the fluid are determined by the thin film which surrounds the bubble, whose shape and thickness are set by the...

The nanoscale is the new frontier of fluid dynamics and its phenomenology can echo at the macroscale as in the canonical example of drop impact on a planar substrate. Unprecedented advances in measurement technology have recently equipped fluid dynamicists with the ability to probe nanoscale effects. The paper by Li et al. ( J. Fluid Mech. , vol. 7...

This paper is associated with a poster winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available online at the Gallery of Fluid Motion, Published by the American Physical Society 2024

This paper is associated with a video winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, Published by the American Physical Society 2024

This paper is associated with a video winner of the 2023 American Physical Society's Division of Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, . Published by the American Physical Society 2024

The Indian Institutes of Technology (IITs) are vital to India's research ecosystem, advancing technology and engineering for industrial and societal benefits. This study reviews the research performance of top IITs-Bombay, Delhi, Madras, Kharagpur, and Kanpur based on Scopus-indexed publications (1952-2024). Research output has grown exponentially,...

This paper is associated with a poster winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available online at the Gallery of Fluid Motion, . Published by the American Physical Society 2024

Introducción Los servicios ecosistémicos son aquellos que la naturaleza provee a los seres vivos y al planeta y garantizan la vida. Los mismos pueden ser recibidos en forma de valores, bienes o de servicio. Para la Organización de las Naciones Unidas para la Alimentación y la Agricultura (FAO) los ríos, son el motor del medio ambiente. Este cambio...

This study investigates the dynamics of thermal plumes interacting with the liquid–air interface in straight-chain alcohols and their mixtures using a photothermal imaging technique based on thermal lensing. This method enables the indirect measurement of temperature gradients via changes in refractive index caused by localized laser heating. Emplo...

During the process of natural gas development, sustained casing pressure (SCP) frequently occurs within the annulus of the gas wells; we specifically referred to the “A” annular space located between the tubing and the production casing in this paper. SCP in an annulus poses a paramount safety challenge, universally acknowledged as a significant th...

This paper is associated with a poster winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available online at the Gallery of Fluid Motion, . Published by the American Physical Society 2024

This paper is associated with a poster winner of a 2023 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available online at the Gallery of Fluid Motion, Published by the American Physical Society 2024

This study delves into the complexities of fluid cleanup processes post-hydraulic fracturing in unconventional gas deposits, focusing on the pivotal role of capillary pressure (Pc) correlations in tight and ultra-tight formations. Utilising Geo2Flow software, this research evaluates the efficacy of existing Pc models, identifying the Brooks and Cor...

For reasons of computational constraint, most global ocean circulation models used for Earth System Modeling still rely on parameterizations of sub-grid processes, and limitations in these parameterizations affect the modeled ocean circulation and impact on predictive skill. An increasingly popular approach is to leverage machine learning approache...