Science topic

# Fluid Dynamics - Science topic

Fluid dynamics is a sub-discipline of fluid mechanics that deals with fluid flow—the natural science of fluids (liquids and gases) in motion.

Publications related to Fluid Dynamics (10,000)

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We are pleased to invite submissions in Special Issue entitled “Mathematical Fluid Dynamics and Symmetry.” This Special Issue will accept high-quality peer-reviewed papers on the mathematical theory of nonlinear fluid dynamics and heat transfer, with special regard to existence and uniqueness theorems, stability questions, regularity criteria, symm...

Background
The structure and function of fire-prone ecosystems are influenced by many interacting processes that develop over varying time scales. Fire creates both instantaneous and long-term changes in vegetation (defined as live, dead, and decomposing plant material) through combustion, heat transfer to living tissues, and subsequent patterns of...

The coronavirus (COVID-19) is becoming more threatening with the emergence of new mutations. New virus transmission and infection processes remain challenging and re-examinations of proper protection methods are urgently needed. From fluid dynamic viewpoint, the transmission of virus-carrying droplets and aerosols is one key to understanding the vi...

A key concept in current fluid dynamics and its applications to biology and technology is a
phenomenon known as wetting. Wetting is familiar from everyday life and is simply the ability of a liquid to stay in contact with a solid surface. The wettability depends on the properties of the liquid and the solid and can be characterized by the static eq...

In this paper, we consider the reduced gravity two-and-a-half-layer model in oceanic fluid dynamics. When the initial perturbation is small in H2(R3)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemarg...

Utilizing an effective corrugation shape in plate heat exchanger (PHE) results in a substantial increase in thermal performance and a more compact design for these devices. This article presents, for the first time in the literature, an innovative PHE design that employs symmetric airfoil profile corrugation (airfoil corrugated PHE). As a consequen...

In this paper, we consider the following viscoelastic problem with variable exponent nonlinearities:
u t t − Δ u + ∫ 0 t g ( t − s ) Δ u ( s ) d s + a | u t | m ( · ) − 2 u t = | u | q ( · ) − 2 u ,
where m(.) and q(.) are two functions satisfying specific conditions. This type of problems appears in fluid dynamics, the electrorheological fluids (s...

The goal of this study is to analyze the impact of Casson fluid, physical parameters, and suction/injection on two‐phase mass transfer effects on unsteady magnetohydrodynamics flow over an elongating surface in the presence of thermal radiation and viscous dissipation. The system of nonlinear ordinary differential equations of flow, energy, and mas...

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IRSN has developed DRACCAR code in order to model loss of coolant accidents (LOCA) in a light water nuclear reactor. The physics during a hypothetical loss of coolant accident involves several phenomena such as heat and mass transfers, fluid dynamics, mechanics, and chem...

In this work a novel mathematical framework, that fully describes the fusion and vapourisation state transitions in multi-component systems, has been applied to assist in understanding the fundamental mechanisms of defect formation and chemical homogenisation in the laser powder bed fusion process (L-PBF). Specifically, the role of vapourisation an...

The present work aims at proposing an optimized physical heat transfer correlation in smooth horizontal fire-tubes (applying a one-dimensional reduced Finite Volume Method - FVM), validated over a wide range of operating conditions. An experimental activity is first carried out, in which the temperature and pressure profiles of the flue gases, stre...

The purpose of this work is to develop a more complete theory regarding solutions to the problem of laminar flow in channels with porous walls. We establish new knowledge regarding the qualitative and quantitative properties of solutions to a fourth order boundary value problem under consideration. In contrast to the previous literature, our strate...

This special issue sets out to review and provide new insights into the bilingual and multilingual education policy in the Greater Bay Area of China (GBA, including Hong Kong, Macau, and Guangdong) in the light of the emerging translanguaging theory (Li Wei, 2018 & 2021; Li & Shen, 2021; Li & Kelly-Holmes, 2022). Specifically, it will apply the tra...

The detection of negative pressure waves (NPWs) is commonly used to localize leakage in pipeline integrity monitoring. However, the velocity of NPWs cannot always be accurately determined under complicated environmental and operational conditions, resulting in localization errors inevitably. Based on a fluid dynamics model of the pipeline, a relati...

Physics-based models have been mainstream in fluid dynamics for developing predictive models. In recent years, machine learning has offered a renaissance to the fluid community due to the rapid developments in data science, processing units, neural network based technologies, and sensor adaptations. So far in many applications in fluid dynamics, ma...

Partial differential equations are commonly used to model various physical phenomena, such as heat diffusion, wave propagation, fluid dynamics, elasticity, electrodynamics and so on. Due to their tremendous applications in scientific and engineering research, many numerical methods have been developed in past decades for efficient and accurate solu...

Ablation strategies remain poorly defined for persistent atrial fibrillation (AF) patients with recurrence despite intact pulmonary vein isolation (PVI). As the ability to perform durable PVI improves, the need for advanced mapping to identify extra-PV sources of AF becomes increasingly evident. Multiple mapping technologies attempt to localize the...

In the last decade, the drone market has grown rapidly for both civil and military purposes. Due to their versatility, the demand for drones is constantly increasing, with several industrial players joining the venture to transfer urban mobility to the air. This has exacerbated the problem of noise pollution, mainly due to the relatively lower alti...

Aerodynamics plays an important role in aviation industry and aircraft design. Detecting and minimizing the phenomenon of flow separation from scattered pressure data on airfoil is critical for ensuring stable and efficient aviation. However, since it is challenging to understand the mechanics of flow field separation, the aerodynamic parameters ar...

We investigate in this paper the global stability of the compressible viscous surface waves in the absence of surface tension effect with a steady-state violating Rayleigh-Taylor instability and the reference domain being the horizontal infinite layer. The fluid dynamics are governed by the 3-D gravity-driven isentropic compressible Navier-Stokes e...

Given the qualitative similarities in the propagation modes of disturbances presented by financial markets and turbulent fluids, in this work, a modeling of the temporal evolution of the S&P 500 stock index is attempted using Fluid Dynamics-informed Neural Networks (FDiNN). The proposed FDiNN methodology is based on the Navier Stokes (NS) fluid dyn...

We propose a mathematical and numerical model for the simulation of the heart function that couples cardiac electrophysiology, active and passive mechanics and hemodynamics, and includes reduced models for cardiac valves and the circulatory system. Our model accounts for the major feedback effects among the different processes that characterize the...

Starting from the general, governing equations for a viscous, compressible fluid written in rotating, spherical coordinates, with an associated prescription for its thermodynamics, we construct a general amplitude perturbation of the background state of the atmosphere. The background state, with a purely zonal flow (wind) is suitably non-dimensiona...

The influence of the orientation of ratchet-type rough surfaces on their fluid dynamic roughness effect is investigated using direct numerical simulations of turbulent channel flow at Reτ=395\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \u...

In this article, first time, a well-known equation, which can be used to analyze the behavior of the bubble formulation in the mixture of gas and liquid in fluid dynamics, has been considered in the form of a non-linear ordinary differential equation in fuzzy environment. In addition, the fuzzy non-linear ordinary differential equation has been pre...

Objective: Investigation of lymph fluid dynamics in thoracic duct during central venous pressure elevation.
Background: Lymphatic flow is affected by elevated central venous pressure (CVP) in congestive heart failure. The changes of thoracic duct (TD) lymph flow have not been studied chronically in the setting of elevated CVP. This study is to inve...

Traditional methods of designing channels of turbomachines are focused on the use of simple geometric lines and surfaces, such as a straight line, arc, plane, cylindrical surface, etc. The design is performed according to recommendations based on experimental data. The other way of designing the channels of turbomachines is related to solving the i...

Pool fires are canonical representations of many accidental fires, which can exhibit an unstable unsteady behaviour, known as puffing, which involves a strong coupling between the temperature and velocity fields. Despite their practical relevance to fire research, their experimental study can be limited due to the complexity of measuring relevant q...

Introduction:
The mainstay of treatment of syringomyelia associated with Chiari malformation type I (CM-I) is the management of CM-I to normalize the cerebrospinal fluid (CSF) flow at the foramen magnum. CM-I is classified into three independent types. Surgical treatment was selected based on the mechanism of hindbrain ptosis in each CM-I type.
M...

This paper presents a study on streamline penetration, velocity error and consequences of a fluid-structure interaction (FSI) solver based on the feedback immersed boundary method (IBM). In the FSI solver, the fluid dynamics is solved by the lattice Boltzmann method; the solid structure deformation is solved by the finite difference method and the...

This article deals with the validation of two analytical spacetime corrections for the extension of the acoustic metafluid model to aeroacoustics. The need for convective metafluid corrections is due to the performance decay of a statically-designed acoustic metafluid device in presence of a mean flow in the hosting fluid. Aeronautical applications...

High generation of heat in the electronics industry presents a roadblock for further innovations in higher processing power due to complications associated with overheating. Commonly used air-based systems cannot cool high-performance electronics, mainly due to the relatively poor thermo-physical properties of air. Spray cooling is a technique capa...

We have presented in this analytical research the revisiting of approach for mathematical modeling the rivulet flows on inclined surface in terms of viscous‐plastic theory of two‐dimensional movements in a frame of (x, y)‐plane in Cartesian coordinates. A semi‐analytical solution has been obtained here for nonstationary creeping approximation of pl...

Cell transport is governed by the interaction of fluid dynamic forces and biochemical factors such as adhesion receptor expression and concentration. Although the effect of endothelial receptor density is well understood, it is not clear how the spacing and local spatial distribution of receptors affect cell adhesion in three-dimensional microvesse...

The goal of this study is to get new analytical solutions for the system of (1+1)-coupled equal width wave equations, which describe physical processes in turbulence and other unstable coupled systems. The system is reduced to an equivalent system of ordinary differential equations using the Lie symmetries. The reduced system after a suitable choic...

The present work shows a novel phase-change concept for simulating landslides using the smoothed particles hydrodynamics (SPH) method. The idea is to initiate the simulation of a slope stability problem with a Solid Mechanics-based SPH, modeling the soil as an elastoplastic material at finite strain. Next, if a particle exceeds a certain level of p...

Compressing porous carbon electrodes is a common approach to improve flow battery performance via a reduction in contact resistance; but the resulting impact on electrode structure, fluid dynamics, and cell performance is not well understood. Here, we employ microtomographic imaging, load cell testing, and flow cell diagnostics to characterize how...

The cerebrospinal fluid (CSF) plays an important role in delivering nutrients and eliminating the metabolic wastes of the central nervous system. An interrupted CSF flow could cause disorders of the brain and eyes such as Alzheimer's disease and glaucoma. This review provides an overview of the anatomy and flow pathways of the CSF system with an em...

The simulation of shallow flows over obstacles is an important problem in environmental fluid dynamics, including exchange flows over seabed sills, atmospheric flows past steep mountains and water flows over river bedforms. A common mathematical treatment consists in using vertically-averaged models instead of vertically-resolved ones by introducin...

In the subcooled boiling flow under low-pressure conditions, bubble characteristic diameter is of great influence on the surface heat transfer coefficient. However, large errors are still found in calculations using traditional mechanistic models or empirical correlations, especially for wide experimental condition. In this paper, we propose a wide...

With the premise that N-soliton solutions are acquired, this paper will focus on the nonlinear superposition between one lump and other types of localised waves of the (2+1)-dimensional generalized Caudrey-Dodd-Gibbon-Kotera-Sawada(gCDGKS) equation. By introducing a novel constraint, combining the long wave limit method and mode resonance method, i...

A Double Multiple Stream Tube (DMST) routine to predict the performance of cross-flow hydrokinetic turbines in real environments is presented, along with a site assessment application to identify the most efficient turbine aspect ratio, solidity and configuration (single, or paired) for a selected area of the Northern Adriatic Sea. The peculiarity...

The focus of this work is on developing a nonlinear grey model for the laminar flow regime of carrier fluid across the flat plate collector. The trust region reflective algorithm was used to solve the nonlinear laminar flow problem and handle the sparse matrix. The stream function, dimensionless velocity, gradients of velocity components, carrier f...

The transitional flow which initiates within the junction (anastomosis) of an arteriovenous fistula (AVF) is known to be a contributing factor in the onset of vascular disease. A novel treatment method involving the implantation of a flexible stent across the anastomosis has enabled the retention of a large proportion of functioning AVFs, despite t...

In the present work a comparison of two softwares (comercial and open source) was made, for the numerical simulation of a multiphase flow comprising water-oil-air of a physical model of a ladle furnace used in secondary refining of steel. The results of the simulations were compared and validated with photograms of the oil aperture in the physical...

There are phenomenon in our surroundings that cannot be fully evaluated efficiently by the mere manual numerical calculations .Fluid dynamics is one of those phenomenon. To fully evaluate the dynamics associated with fluid flowing through a pipe and heat transfer during the process, software based simulation is used. Here COMSOL Multiphysics 3.5a,...

The rate-controlled production (RCP) inflow control devices (ICDs) are valves placed in the lower completion of oil and gas wells, capable of autonomously controlling the reservoir inflow. This completion technology self-regulates the inflow of undesired phases, such as water, by choking the flow after the breakthrough event, thus improving the rec...

The main objective of this investigation to examine the momentum and thermal transportation of rotating dusty micropolar fluid flux with suspension of conducting dust particles across the stretched sheet. The novelty of the flow model is the exploration of the significance of boosting the volume concentration of dust particles in fluid dynamics. Th...

Fluid dynamics simulations with the lattice Boltzmann method (LBM) are very memory intensive. Alongside reduction in memory footprint, significant performance benefits can be achieved by using FP32 (single) precision compared to FP64 (double) precision, especially on GPUs. Here we evaluate the possibility to use even FP16 and posit16 (half) precisi...

A data-driven and equation-free approach is proposed and discussed to forecast responses of ships maneuvering in waves, based on the dynamic mode decomposition (DMD). DMD is a dimensionality-reduction/reduced-order modeling method, which provides a linear finite-dimensional representation of a possibly nonlinear system dynamics by means of a set of...

Temperature gradient‐induced Marangoni convection has attracted much attention for basic research and applications since it provides an effective means for mass and heat transfer through a liquid surface flow. Here the authors first propose a general principle to enhance such surface flow by hindering its transition to recirculation flow using an e...

The success of immunotherapeutic approaches strictly depends on the immune cells interaction with cancer cells. While conventional in vitro cell cultures under-represent the complexity and dynamic crosstalk of the tumor microenvironment, animal models do not allow deciphering the anti-tumor activity of the human immune system. Therefore, the develo...

We investigate the statistics of rogue waves occurring in the inverse cascade of surface gravity wave turbulence. In such statistically homogeneous, stationary and isotropic wave fields, low-frequency waves are generated by nonlinear interactions rather than directly forced by a wave maker. This provides a laboratory realization of arguably the sim...

Dear Colleagues,
Manuscript submission is now open for a new Special Issue "Advances in Solid Waste Processing and Recycling Technologies for Civil Engineering Materials" in Fluid Dynamics and Materials Processing.
We would be delighted to feature your work and hope you will contribute an original research article/review or a less time-consuming...

Advanced reactors are expected to play an important role in the future nuclear power. However, their development and deployment are hindered by the absence of reliable and efficient models for system thermal hydraulic (TH) analysis. For instance, mixing and thermal stratification in the reactor enclosures cannot be captured by traditional 1D system...

In this paper, a generalized long-wave shortwave resonance interaction system, which describes the nonlinear interaction between a shortwave and a long-wave in fluid dynamics, plasma physics and nonlinear optics, is considered. Using the Hirota bilinear method, the general N-bright and N-dark soliton solutions are deduced and their Gram determinant...

In this work, We are looking at the characteristics of micropolar flow in a porous channel that's being driven by suction or injection. The working of the fluid describes in the flow model. We can reduce the governing nonlinear partial differential equations (PDEs) to a model of coupled systems of nonlinear ordinary differential equations using sim...

Threshold pressure gradient (TPG) is a key parameter determining the pore-scale fluid dynamics. In tight gas reservoirs, both gas and water exist in the porous rock, and the existing water can be divided into irreducible and movable water. However, how movable water saturation will influence TPG has not yet been investigated. Therefore herein, nucl...

The purpose of this paper is the identification of high-fidelity digital twin data models
from numerical code outputs by non-intrusive techniques (i.e., not requiring Galerkin projection of the governing equations onto the reduced modes basis). In this paper the author defines the concept of the digital twin data model (DTM) as a model of reduced c...

Thermo-responsive hydrogels are a promising material for creating controllable actuators for use in micro-scale devices, since they expand and contract significantly (absorbing or expelling fluid) in response to relatively small temperature changes. Understanding such systems can be difficult because of the spatially- and temporally-varying propert...