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  • A numerical investigation on single-phase flow characteristics and frictional pressure drop in helical pipes
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-07-20
    Pengxin Cheng, Nan Gui, Xingtuan Yang, Jiyuan Tu, Shengyao Jiang and Haijun Jia

    Helical pipes have been widely applied in a vast range of industries owing to the remarkable characteristics. In practice, they still face the challenge of undesirable increased pressure resistance. The investigation on the flow characteristics in helix is essential to explore the pressure loss mechanism. In this paper, the k − ω model and k − ω SST model are utilized to investigate the flow characteristics

    更新日期:2020-07-21
  • Experimental investigation of the ground effect on a wing without/with trailing edge flap
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-07-20
    Khalida Sekhoune Özden, İlyas Karasu and Mustafa Serdar Genç

    In this study, the ground effect over a wing without/with a flap at low Reynolds numbers was investigated experimentally. Three-dimensional flow fields over and behind a flapped wing and single (without flap) wing in/out of ground effect at several clearances and Re numbers (0.75 × 10 5 , 1 × 10 5 and 1.5 × 10 5 ) were investigated using three different experimental methods. From flow visualization

    更新日期:2020-07-21
  • Structures of wing-tip vortices at low Reynolds numbers and their modelling
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-07-08
    Hiroshi Koizumi and Yuji Hattori

    The structures of wing-tip vortices at a low Reynolds number ( ##IMG## [http://ej.iop.org/images/1873-7005/52/4/045503/fdrab9b63ieqn1.gif] {$Re_c = 10^3$} ) are studied by direct numerical simulation. After confirming the basic features of the wing-tip vortices, the distributions of axial vorticity and velocity are investigated in detail. The vorticity distribution consists of a dominant symmetric

    更新日期:2020-07-09
  • Convective heat transfer and laminar flow characteristics of flow over a circular cylinder in presence of control plates
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-07-08
    Hemanth A V S S, Malaikannan G and Deepakkumar R

    The location and orientation effect of control plates (CP) in and around the flow separation region of a circular cylinder has been numerically investigated in the laminar flow regime at Reynolds number 100. The vortex shedding and convective heat transfer characteristics have been analysed for both upstream and downstream locations of the control plates using Ansys Fluent 18.0. The drag and lift coefficient

    更新日期:2020-07-09
  • Instabilities of a liquid column jet in a surrounding gas flowing through a coaxial cylindrical sheath
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-07-08
    Takao Yoshinaga

    In this paper, instabilities and breakup phenomena of a viscous liquid column jet in an inviscid stationary surrounding gas are analytically investigated, when the jet flows through a coaxial cylindrical sheath. Under a long wave approximation, axisymmetric non-linear evolution equations of the jet and surrounding gas are derived and numerically solved under a spatially periodic boundary condition

    更新日期:2020-07-09
  • Vortex-induced vibrations of a circular cylinder with two symmetrically arranged control rods
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-07-01
    Wenbo Wu and Jiasong Wang

    In this paper, the vortex-induced vibration (VIV) of a main cylinder with two symmetrically arranged control rods at Reynolds number of 500 is numerically simulated. The control rods and the main cylinder are connected rigidly and can move synchronously, which is modeled as a spring oscillator with double degree of freedom. Seven gap ratios ( G/D = 0.1 ~2) and sixteen angles ( α = 15° ~165°) are used

    更新日期:2020-07-02
  • New perspectives on mass conservation law and waves in fluid mechanics
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-06-15
    Tsutomu Kambe

    Noether’s theorem reads: ‘A symmetry implies a conservation law’. From a single relativistic energy equation of fluid motion, two conservation equations are obtained in the non-relativistic limit: mass conservation and energy conservation of traditional form. We are concerned with the mass conservation equation and investigate what symmetry implies the mass conservation, and conversely what symmetry

    更新日期:2020-06-15
  • Comparative study of downwardly propagating CH 4 /C 3 H 8 —air flames along a closed-end tube
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-06-14
    C E Ebieto

    Experimental work is reported for premixed flames propagating in tubes. The flames were ignited with a pilot flame and the flame propagation captured with high-speed cameras. Initial measurements were performed characterizing the rig. For downwardly propagating flames to a closed-end, methane and propane were studied. The flames initially propagated steadily, then at approximately a third of the way

    更新日期:2020-06-14
  • On the instability of finite-amplitude inertia-gravity waves
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-06-03
    M V Kurgansky

    The hydrodynamic instability of monochromatic inertia-gravity waves (IGWs) of finite amplitude, propagating at small angles either to the vertical or horizontal, is studied. In both cases, the corresponding angle serves as a small parameter in the problem, and instability is investigated using the Galerkin method. For IGWs that propagate at a small angle to the vertical, it is shown that stable density

    更新日期:2020-06-03
  • A filamentary cascade model of the inertial range
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-05-20
    Stephen Childress and Andrew D Gilbert

    This paper develops a simple model of the inertial range of turbulent flow, based on a cascade of vortical filaments. The filaments are taken to be helical, one turn of the helix playing the role of a turbulent eddy. A binary branching structure is proposed, involving the splitting of filaments at each step into pairs of daughter filaments with differing properties, in effect two distinct simultaneous

    更新日期:2020-05-20
  • Stationary convection in a binary mixture of ferrofluids in a porous medium
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-05-17
    P Hounsou, A V Monwanou, C H Miwadinou and J B Chabi Orou

    The Brinkman model is used to study the criterion of appearance of stationary convection in a porous horizontal layer saturated by a binary mixture of ferrofluids and heated from below. The analytical expression of the Rayleigh number is determined by dimensionless numbers for the combined effects of buoyancy and magnetic force on the one hand and magnetic force alone on the other. The effect of Darcy’s

    更新日期:2020-05-17
  • A GENERIC formalism for Korteweg-type fluids: II. Higher-order models and relation to microforces
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-05-04
    Yukihito Suzuki

    In this paper, a second order model for Korteweg-type fluids is derived within the GENERIC formalism, whose standard application to Korteweg-type fluids is studied in detail in Part I of this series of papers. The higher-order model contains the second-order gradient of the density in the constitutive relation concerning internal energy, and the resulting Korteweg stress covers the original model proposed

    更新日期:2020-05-04
  • Isolated columnar vortex generation: influence of momentum impulsion characteristics and wall roughness
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-05-04
    Yann Devaux, Lionel Thomas, Damien Calluaud and Gérard Pineau

    This paper reports an experimental investigation of a vertical vortex advected over a rigid wall. The main goal is to study an unstationary, isolated structure, which reproduces a tornado-like flow in an hydraulic environment. The focus is set on the near-wall region, with two types of boundary condition: a smooth wall and a non-erodible sediment bed. Optical methods such as planar and stereoscopic

    更新日期:2020-05-04
  • The effect of numerical divergence schemes on the flow around trains
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-04-27
    Tian Li, Hassan Hemida, Mohammad Mehdi Rashidi and Weihua Zhang

    The influence of divergence schemes in typical turbulence modelling on the aerodynamic behaviours was investigated in this study. Four common divergence schemes have been used to predict the aerodynamic behaviours of a typical train in crosswinds, including the first order upwind differencing (UD), second order limited-linear differencing (LL), linear-upwind differencing (LU) and Linear-upwind stabilized

    更新日期:2020-04-27
  • Non-Newtonian effects on solid particles settling in sharp stratification
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-04-13
    Sajad Amooshahi and Morteza Bayareh

    Gravitational settling of solid particles through density interfaces is studied numerically when at least one of the fluids is non-Newtonian. The Carreau–Yasuda model is used to model the shear-thinning behavior of the non-Newtonian fluid. The coupled level-set and volume-of-fluid method is used to track the interface between the two fluids. It is found that the presence of shear-thinning fluids significantly

    更新日期:2020-04-13
  • Predicting the unsteady states of 2D and 3D lid-driven cavities induced by a centrally located circle and sphere
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-30
    Basma Souayeh, Mir-Waqas Alam, Fayçal Hammami, Najib Hdhiri and Essam Yasin

    This investigation addresses a systematic numerical method based on the finite volume method and a full multigrid technique to study two-dimensional and three-dimensional flow of an incompressible fluid inside a cavity driven by the motion of the upper lid. Quantitative aspects of two and three dimensional flows in lid-driven cavities are analyzed by encompassing descriptive Reynolds numbers Re bounded

    更新日期:2020-03-30
  • Numerical study of the combined stroke swimmer in an incompressible fluid
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-26
    Aditya Kumar, Mathieu Pourquie, Daniel See-Wai Tam and Gijsbert Ooms

    A numerical simulation has been made of the combined stroke swimmer (a deformable sphere) and compared with the results of the second-order perturbation theory of Felderhof and Jones (2017). At a small ratio of the amplitude of the deformation of the sphere and the radius of the sphere the numerical and theoretical results agree well. However for a larger value of this ratio the results deviate due

    更新日期:2020-03-26
  • Model of the flow on Columnar vortex generator
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-26
    Rafael Bardera and Juan Carlos Matías García

    Flow control devices are one of the most commonly studied fields of aerodynamic research in the world. This is because improvements in the aerodynamic performance of any vehicle lead directly to save fuel and money and reduce their operational costs. Another reason is that flow control can reduce the risk of aerial vehicles operating near complex structures which can generate high turbulence intensity

    更新日期:2020-03-26
  • A comparative study on instability of steady flows in helical pipes
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-19
    A Yu Gelfgat

    A computational study of three-dimensional instability of steady flows in a helical pipe of arbitrary curvature and torsion is carried out for the first time. The problem is formulated in Germano coordinates in two equivalent but different forms of the momentum equations so that results obtained using both formulations cross verify each other. An additional formulation in the cylindrical coordinates

    更新日期:2020-03-19
  • Gradual contraction of pipe cross-section effects on transient behavior of air–water slug flow
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-19
    Mehdi Karimi, Mohammad Akhlaghi, Nowrouz Mohammad Nouri, Morteza Taherkhani and Vahid Mohammadi

    The current experimental investigation was aimed at understanding the influence of reducing sections on the transient behavior of slug flow. Experiments were carried out using two concentric area cross-section reducers with 160 mm lengths; the first one was shaped as a conical frustum with a 44 mm inlet diameter reducing to a 30 mm outlet diameter and the second one as a frustum with the same inlet

    更新日期:2020-03-19
  • Flow control of non-slender delta wings by leading-edge modifications
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-19
    Martin Rein, Felix Busse, Frank Edzards, Hartmut Haselmeyer, Gebhard Höhler and Lars Siegel

    Different concepts for controlling a non-slender delta wing are considered and compared with each other. The concepts are based on geometrical modifications of the leading edges. The strategy aims at producing an asymmetric distribution of lift due to vortices on the left and right wing half and thus, for example, rolling moments to be used in controlling the model. The effectiveness of different approaches

    更新日期:2020-03-19
  • Cilia-driven fluid flow in a curved channel: effects of complex wave and porous medium
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-19
    Zeeshan Asghar, Khurram Javid, Muhammad Waqas, Abuzar Ghaffari and Waqar Azeem Khan

    The current study deals the theoretical investigation of a viscous fluid due to metachronal waves of cilia through the curved channel with porous medium effects. Due to the complex nature of flow regime, curvilinear coordinates are used to develop constitutive equations for two-dimensional flow. Firstly, the whole system is transformed from fixed frame to wave frame of reference. Secondly, the scaling

    更新日期:2020-03-19
  • A phase field method for the numerical simulation of rigid particulate in two-phase flows
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-12
    Shi Yi

    In this paper, we propose a phase field method for the numerical simulations of a moving solid object in two-phase flows. A three-phase Cahn–Hilliard and Navier–Stokes model is employed for this problem. The solid region is represented by a single phase in the three-phase system. The rigidity constraint of the solid phase and the no-slip boundary condition on the solid-fluid interface is imposed by

    更新日期:2020-03-12
  • Steady flow in a rapidly rotating spheroid with weak precession: I
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2020-03-12
    Shigeo Kida

    The celebrated Poincaré (1910) steady solution, the uniform vorticity flow in a precessing spheroid, which is realized in the inviscid interior region outside the boundary layer in the strong spin and weak precession limit, is derived, as a unique solution analytically without any prior assumption on the spatial structure, and its singular behavior for a sphere is resolved. Assuming that the spin and

    更新日期:2020-03-12
  • Dynamic Mode Decomposition of Fontan Hemodynamics in an Idealized Total Cavopulmonary Connection.
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2014-09-02
    Yann T Delorme,Anna-Elodie M Kerlo,Kameswararao Anupindi,Mark D Rodefeld,Steven H Frankel

    Univentricular heart disease is the leading cause of death from any birth defect in the first year of life. Typically, patients have to undergo three open heart surgical procedures within the first few years of their lives to eventually directly connect the superior and inferior vena cavae to the left and right pulmonary arteries forming the Total Cavopulmonary Connection or TCPC. The end result is

    更新日期:2019-11-01
  • Elastic capsule deformation in general irrotational linear flows.
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2013-02-22
    Alex C Szatmary,Charles D Eggleton

    Knowledge of the response of elastic capsules to imposed fluid flow is necessary for predicting deformation and motion of biological cells and synthetic capsules in microfluidic devices and in the microcirculation. Capsules have been studied in shear, planar extensional, and axisymmetric extensional flows. Here, the flow gradient matrix of a general irrotational linear flow is characterized by two

    更新日期:2019-11-01
  • ON THE SINGLE-MASS MODEL OF THE VOCAL FOLDS.
    Fluid Dyn. Res. (IF 0.918) Pub Date : 2010-04-27
    M S Howe,R S McGowan

    An analysis is made of the fluid-structure interactions necessary to support self-sustained oscillations of a single-mass mechanical model of the vocal folds subject to a nominally steady subglottal overpressure. The single-mass model of Fant and Flanagan is re-examined and an analytical representation of vortex shedding during 'voiced speech' is proposed that promotes cooperative, periodic excitation

    更新日期:2019-11-01
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