Special Issues
Table of Content

Advanced Problems in Fluid Mechanics

Submission Deadline: 31 March 2024 (closed) View: 4129

Guest Editors

Prof. T.P. Lyubimova, Institute of Continuous Media Mechanics Ural Branch of Russian Academy of Sciences, Russia.
Doctor of Science in Physics and Mathematics, Professor, Honored Scientist of the Russian Federation, Head of the Computational Fluid Dynamics Laboratory of the Institute of Continuous Media Mechanics of the Russian Academy of Sciences, Professor at the Theoretical Physics Department of Perm State University. Scientific interests are in the field of hydrodynamic stability, multiphase flows, computational fluid dynamics. According to Scopus, she has 307 papers, 2712 citations, H-index 24. Over the last 3 years, 50 papers have been published in Journals included in the Scopus database.

Summary

This issue is devoted to the advanced problems in Fluid Mechanics and their applications to material science and technology. The scope includes and not limited by the following directions:

· Hydrodynamic stability and transition to turbulence

· Multiphase flows

· Interfacial fluid dynamics

· Convective heat and mass transfer

· Flows in microchannels

· Flows in porous media

· Flows in fluids with complex rheology

· Acoustic and wave processes in heterogeneous media

· Control of flows by vibration and rotation

· Flows in biological systems

· Environmental flows and their applications to technological and environmental processes. Original research papers and reviews are welcome.


Keywords

Hydrodynamic stability, Multiphase flows, Interfacial Flows, Porous Media, Heat/Mass Transfer, Complex Fluids, Flows in Microchannels, Biological flows, Acoustic and Wave Processes, Environmental flows

Published Papers


  • Open Access

    ARTICLE

    A Method Based on Thermo-Vibrational Effects for Hydrogen Transportation and Storage

    Tatyana P. Lyubimova, Sergey A. Plotnikov, Albert N. Sharifulin, Vladimir Ya. Modorskii, Sergey S. Neshev, Stanislav L. Kalyulin
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.054498
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract Transporting and storing hydrogen is a complex technological task. A typical problem relates to the need to minimize the strength of fluid motion and heat transfer near the walls of the container. In this work this problem is tackled numerically assuming an infinite cavity of pipe square cross-section, located in a constant external temperature gradient. In particular, a method based on the application of vibrations to suppress the gravitational convection mechanism is explored. A parametric investigation is conducted and the limits of applicability of the method for small Grashof numbers (10e4) are determined. It is More >

  • Open Access

    ARTICLE

    Influence of Rayleigh-Taylor Instability on Impurity Dynamics during Column Back-Flushing Filtration

    Yanina N. Parshakova, Andrey Ivantsov
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052396
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract During the manufacturing or processing of materials, large volumes of water of the required quality are often needed. Industrial water treatment and water purification is the process of removing impurities and pollution from the considered medium. To obtain liquid with specified quality parameters, complex systems of filters and treatment facilities are generally used. In this work, the cleaning process for a filtration column is studied. Three-dimensional numerical simulations of flow in a columnar array consisting of a porous medium are conducted. In particular, a model case corresponding to laboratory conditions is examined, with potassium salt… More >

  • Open Access

    ARTICLE

    Stability of a Viscous Liquid Film in a Rotating Cylindrical Cavity under Angular Vibrations

    Victor Kozlov, Alsu Zimasova, Nikolai Kozlov
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052398
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The behavior of a viscous liquid film on the wall of a rapidly rotating cylinder subjected to angular vibrations is experimentally studied. The cavity is filled with an immiscible low-viscosity liquid of lower density. In the absence of vibrations, the high viscosity liquid covers the inner surface of the cylinder with a relatively thin axisymmetric film; the low-viscosity liquid is located in the cavity interior. It is found that with an increase in the amplitude of rotational vibrations, the axisymmetric interphase boundary loses stability. An azimuthally periodic 2D “frozen wave” appears on the film surface… More >

  • Open Access

    ARTICLE

    The Behavior of a Gas Bubble in a Square Cavity Filled with a Viscous Liquid Undergoing Vibrations

    Tatyana Lyubimova, Yulia Garicheva, Andrey Ivantsov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.11, pp. 2417-2429, 2024, DOI:10.32604/fdmp.2024.052391
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract External vibrations are known to be one of the promising ways to control the behavior of multiphase systems. The computational modeling of the behavior of a gas bubble in a viscous liquid in a horizontal cylinder of square cross-section, which undergoes linearly polarized translational oscillations in weightless conditions, has been carried out. Under vibrations, the bubble moves towards the wall of the vessel with acceleration determined by the amplitudes and frequency of vibrations. Near the wall, at a distance of the order of the thickness of the viscous Stokes boundary layer, the effects of viscosity More >

  • Open Access

    ARTICLE

    Experimental Study of Thermal Convection and Heat Transfer in Rotating Horizontal Annulus

    Alexei Vjatkin, Svyatoslav Petukhov, Victor Kozlov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.11, pp. 2475-2488, 2024, DOI:10.32604/fdmp.2024.052377
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract A genuine technological issue–the thermal convection of liquid in a rotating cavity–is investigated experimentally. The experiments are conducted within a horizontal annulus with isothermal boundaries. The inner boundary of the annulus has a higher temperature, thus exerting a stabilising influence on the system. It is shown that when the layer rotation velocity diminishes, two-dimensional azimuthally periodic convective rolls, rotating together with the cavity, emerge in a threshold manner. The development of convection is accompanied by a significant intensification of heat transfer through the layer. It is shown that the averaged thermal convection excitation in the… More >

    Graphic Abstract

    Experimental Study of Thermal Convection and Heat Transfer in Rotating Horizontal Annulus

  • Open Access

    ARTICLE

    Stability of the Liquid-Vapor Interface under the Combined Influence of Normal Vibrations and an Electric Field

    Vladimir Konovalov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.11, pp. 2541-2563, 2024, DOI:10.32604/fdmp.2024.051219
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The regime of horizontal subcooled film boiling is characterized by the formation of a thin layer of vapor covering the surface of a flat horizontal heater. Based on the equations of motion of a viscous incompressible fluid and the equation of heat transfer, the stability of such a vapor film is investigated. The influence of the modulation of the gravity field caused by vertical vibrations of the heater of finite frequency, as well as a constant electric field applied normal to the surface of the heater, is taken into account. It is shown that in… More >

  • Open Access

    ARTICLE

    Libration-Generated Average Convection in a Rotating Flat Layer with Horizontal Axis

    Kirill Rysin
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.10, pp. 2235-2249, 2024, DOI:10.32604/fdmp.2024.052324
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The study of average convection in a rotating cavity subjected to modulated rotation is an interesting area for the development of both fundamental and applied science. This phenomenon finds application in the field of mass transfer and fluid flow control, relevant examples being crystal growth under reduced gravity and fluid mixing in microfluidic devices for cell cultures. In this study, the averaged flow generated by the oscillating motion of a fluid in a planar layer rotating about a horizontal axis is experimentally investigated. The boundaries of the layer are maintained at constant temperatures, while the… More >

  • Open Access

    ARTICLE

    The Disintegration of a Floating Ferrofluid Layer into an Ordered Drop System in a Vertical Magnetic Field

    Christina Khokhryakova, Konstantin Kostarev, Irina Mizeva
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.10, pp. 2205-2218, 2024, DOI:10.32604/fdmp.2024.051053
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract Magnetic fluids, also known as ferrofluids, are versatile functional materials with a wide range of applications. These applications span from industrial uses such as vacuum seals, actuators, and acoustic devices to medical uses, including serving as contrast agents for magnetic resonance imaging (MRI), delivering medications to specific locations within the body, and magnetic hyperthermia for cancer treatment. The use of a non-wettable immiscible liquid substrate to support a layer of magnetic fluid opens up new possibilities for studying various fluid flows and related instabilities in multi-phase systems with both a free surface and an interface.… More >

    Graphic Abstract

    The Disintegration of a Floating Ferrofluid Layer into an Ordered Drop System in a Vertical Magnetic Field

  • Open Access

    ARTICLE

    Three-Dimensional Convection in an Inclined Porous Layer Subjected to a Vertical Temperature Gradient

    Ivan Shubenkov, Tatyana Lyubimova, Evgeny Sadilov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.9, pp. 1957-1970, 2024, DOI:10.32604/fdmp.2024.050167
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract In this paper, we study the onset and development of three-dimensional convection in a tilted porous layer saturated with a liquid. The layer is subjected to a gravitational field and a strictly vertical temperature gradient. Typically, problems of thermal convection in tilted porous media saturated with a liquid are studied by assuming constant different temperatures at the boundaries of the layer, which prevent these systems from supporting conductive (non-convective) states. The boundary conditions considered in the present work allow a conductive state and are representative of typical geological applications. In an earlier work, we carried… More >

    Graphic Abstract

    Three-Dimensional Convection in an Inclined Porous Layer Subjected to a Vertical Temperature Gradient

  • Open Access

    ARTICLE

    Influence of Surface Ice Roughness on the Aerodynamic Performance of Wind Turbines

    Xin Guan, Mingyang Li, Shiwei Wu, Yuqi Xie, Yongpeng Sun
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.9, pp. 2029-2043, 2024, DOI:10.32604/fdmp.2024.049499
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The focus of this research was on the equivalent particle roughness height correction required to account for the presence of ice when determining the performances of wind turbines. In particular, two icing processes (frost ice and clear ice) were examined by combining the FENSAP-ICE and FLUENT analysis tools. The ice type on the blade surfaces was predicted by using a multi-time step method. Accordingly, the influence of variations in icing shape and ice surface roughness on the aerodynamic performance of blades during frost ice formation or clear ice formation was investigated. The results indicate that More >

  • Open Access

    ARTICLE

    Vibrational Suspension of Two Cylinders in a Rotating Liquid-Filled Cavity with a Time-Varying Rotation Rate

    Olga Vlasova
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.9, pp. 2127-2137, 2024, DOI:10.32604/fdmp.2024.051202
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The dynamics of rotating hydrodynamic systems containing phase inclusions are interesting due to the related widespread occurrence in nature and technology. The influence of external force fields on rotating systems can be used to control the dynamics of inclusions of various types. Controlling inclusions is of current interest for space technologies. In low gravity, even a slight vibration effect can lead to the appearance of a force acting on phase inclusions near a solid boundary. When vibrations are applied to multiphase hydrodynamic systems, the oscillating body intensively interacts with the fluid and introduces changes in… More >

  • Open Access

    ARTICLE

    Applying the Shearlet-Based Complexity Measure for Analyzing Mass Transfer in Continuous-Flow Microchannels

    Elena Mosheva, Ivan Krasnyakov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.8, pp. 1743-1758, 2024, DOI:10.32604/fdmp.2024.049146
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract Continuous-flow microchannels are widely employed for synthesizing various materials, including nanoparticles, polymers, and metal-organic frameworks (MOFs), to name a few. Microsystem technology allows precise control over reaction parameters, resulting in purer, more uniform, and structurally stable products due to more effective mass transfer manipulation. However, continuous-flow synthesis processes may be accompanied by the emergence of spatial convective structures initiating convective flows. On the one hand, convection can accelerate reactions by intensifying mass transfer. On the other hand, it may lead to non-uniformity in the final product or defects, especially in MOF microcrystal synthesis. The ability… More >

    Graphic Abstract

    Applying the Shearlet-Based Complexity Measure for Analyzing Mass Transfer in Continuous-Flow Microchannels

  • Open Access

    ARTICLE

    Phase Transition in a Dense Swarm of Self-Propelled Bots

    Dmitry Bratsun, Kirill Kostarev
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.8, pp. 1785-1798, 2024, DOI:10.32604/fdmp.2024.048206
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract Swarms of self-organizing bots are becoming important elements in various technical systems, which include the control of bacterial cyborgs in biomedical applications, technologies for creating new metamaterials with internal structure, self-assembly processes of complex supramolecular structures in disordered media, etc. In this work, we theoretically study the effect of sudden fluidization of a dense group of bots, each of which is a source of heat and follows a simple algorithm to move in the direction of the gradient of the global temperature field. We show that, under certain conditions, an aggregate of self-propelled bots can… More >

    Graphic Abstract

    Phase Transition in a Dense Swarm of Self-Propelled Bots

  • Open Access

    ARTICLE

    Numerical Analysis of Permeability of Functionally Graded Scaffolds

    Dmitry Bratsun, Natalia Elenskaya, Ramil Siraev, Mikhail Tashkinov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.7, pp. 1463-1479, 2024, DOI:10.32604/fdmp.2024.047928
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract In this work, we numerically study the hydrodynamic permeability of new-generation artificial porous materials used as scaffolds for cell growth in a perfusion bioreactor. We consider two popular solid matrix designs based on triply periodic minimal surfaces, the Schwarz P (primitive) and D (diamond) surfaces, which enable the creation of materials with controlled porosity gradients. The latter property is crucial for regulating the shear stress field in the pores of the scaffold, which makes it possible to control the intensity of cell growth. The permeability of functionally graded materials is studied within the framework of… More >

    Graphic Abstract

    Numerical Analysis of Permeability of Functionally Graded Scaffolds

  • Open Access

    ARTICLE

    Experimental Study of Liquid Metal Flow for the Development of a Contact-Less Control Technique

    Aleksandr Poluyanov, Ilya Kolesnichenko
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.7, pp. 1553-1563, 2024, DOI:10.32604/fdmp.2024.050165
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The article presents an experimental study on the flow of an eutectic gallium alloy in a cylindrical cell, which is placed in an alternating magnetic field. The magnetic field is generated by a coil connected to an alternating current source. The coil is located at a fixed height in such a way that its plane is perpendicular to the gravity vector, which in turn is parallel to the axis of the cylinder. The position of the cylinder can vary in height with respect to the coil. The forced flow of the considered electrically conductive liquid… More >

    Graphic Abstract

    Experimental Study of Liquid Metal Flow for the Development of a Contact-Less Control Technique

  • Open Access

    ARTICLE

    Numerical Simulation of Thermocapillary Convection with Evaporation Induced by Boundary Heating

    O. N. Goncharova, V. B. Bekezhanova
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.7, pp. 1667-1686, 2024, DOI:10.32604/fdmp.2024.047959
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The dynamics of a bilayer system filling a rectangular cuvette subjected to external heating is studied. The influence of two types of thermal exposure on the flow pattern and on the dynamic contact angle is analyzed. In particular, the cases of local heating from below and distributed thermal load from the lateral walls are considered. The simulation is carried out within the frame of a two-sided evaporative convection model based on the Boussinesq approximation. A benzine–air system is considered as reference system. The variation in time of the contact angle is described for both heating More >

    Graphic Abstract

    Numerical Simulation of Thermocapillary Convection with Evaporation Induced by Boundary Heating

  • Open Access

    ARTICLE

    Oscillatory Dynamics of a Spherical Solid in a Liquid in an Axisymmetric Variable Cross Section Channel

    Ivan Karpunin
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.6, pp. 1219-1232, 2024, DOI:10.32604/fdmp.2024.051062
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The dynamics of a solid spherical body in an oscillating liquid flow in a vertical axisymmetric channel of variable cross section is experimentally studied. It is shown that the oscillating liquid leads to the generation of intense averaged flows in each of the channel segments. The intensity and direction of these flows depend on the dimensionless oscillating frequency. In the region of studied frequencies, the dynamics of the considered body is examined when the primary vortices emerging in the flow occupy the whole region in each segment. For a fixed frequency, an increase in the… More >

  • Open Access

    ARTICLE

    Convection and Stratification of Temperature and Concentration

    Alexey Fedyushkin
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.6, pp. 1351-1364, 2024, DOI:10.32604/fdmp.2024.050267
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract This study is devoted to an analysis of natural convection and the emergence of delamination in an incompressible fluid encapsulated in a closed region heated from the side. Weak, medium and intensive modes of stationary laminar thermal and thermo-concentration convection are considered. It is shown that nonlinear flow features can radically change the flow structure and characteristics of heat and mass transfer. Moreover, the temperature and concentration segregation in the center of the square region display a non-monotonic dependence on the Grashof number (flow intensity). The formation of a nonstationary periodic structure of thermal convection More >

  • Open Access

    ARTICLE

    Modeling of Leachate Propagation in a Municipal Solid Waste Landfill Foundation

    Nadezhda Zubova, Andrey Ivantsov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.6, pp. 1407-1424, 2024, DOI:10.32604/fdmp.2024.051130
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The study deals with the numerical modeling of leachate distribution in the porous medium located under a municipal solid waste disposal landfill (MSWLF). The considered three-layer system is based on geological data obtained from field measurements. For simplicity, the problem is investigated by assuming a two-component approach. Nevertheless, the heat produced by landfills due to biological and chemical processes and the thermal diffusion mechanism contributing to pollution transport are taken into account. The numerical modeling of the propagation of leachate in the considered layered porous medium is implemented for parameters corresponding to natural soil and More >

  • Open Access

    ARTICLE

    A Numerical Investigation of the Effect of Boundary Conditions on Acoustic Pressure Distribution in a Sonochemical Reactor Chamber

    Ivan Sboev, Tatyana Lyubimova, Konstantin Rybkin, Michael Kuchinskiy
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.6, pp. 1425-1439, 2024, DOI:10.32604/fdmp.2024.051341
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The intensification of physicochemical processes in the sonochemical reactor chamber is widely used in problems of synthesis, extraction and separation. One of the most important mechanisms at play in such processes is the acoustic cavitation due to the non-uniform distribution of acoustic pressure in the chamber. Cavitation has a strong impact on the surface degradation mechanisms. In this work, a numerical calculation of the acoustic pressure distribution inside the reactor chamber was performed using COMSOL Multiphysics. The numerical results have revealed the dependence of the structure of the acoustic pressure field on the boundary conditions More >

    Graphic Abstract

    A Numerical Investigation of the Effect of Boundary Conditions on Acoustic Pressure Distribution in a Sonochemical Reactor Chamber

  • Open Access

    ARTICLE

    On the Features of Thermal Convection in a Compressible Gas

    Igor B. Palymskiy
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.5, pp. 957-974, 2024, DOI:10.32604/fdmp.2024.048829
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The fully nonlinear equations of gas dynamics are solved in the framework of a numerical approach in order to study the stability of the steady mode of Rayleigh-Bénard convection in compressible, viscous and heat-conducting gases encapsulated in containers with no-slip boundaries and isothermal top and bottom walls. An initial linear temperature profile is assumed. A map of the possible convective modes is presented assuming the height of the region and the value of the temperature gradient as influential parameters. For a relatively small height, isobaric convection is found to take place, which is taken over… More >

  • Open Access

    ARTICLE

    Influence of Methane-Hydrogen Mixture Characteristics on Compressor Vibrations

    Vladimir Ya. Modorskii, Ivan E. Cherepanov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.5, pp. 1031-1043, 2024, DOI:10.32604/fdmp.2024.048494
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract A transition to clean hydrogen energy will not be possible until the issues related to its production, transportation, storage, etc., are adequately resolved. Currently, however, it is possible to use methane-hydrogen mixtures. Natural gas can be transported using a pipeline system with the required pressure being maintained by gas compression stations. This method, however, is affected by some problems too. Compressors emergency stops can be induced by vibrations because in some cases, mechanical methods are not able to reduce the vibration amplitude. As an example, it is known that a gas-dynamic flow effect in labyrinth… More >

  • Open Access

    ARTICLE

    Investigation of Cavitation in NaCl Solutions in a Sonochemical Reactor Using the Foil Test Method

    Michael Kuchinskiy, Tatyana Lyubimova, Konstantin Rybkin, Anastasiia Sadovnikova, Vasiliy Galishevskiy
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.5, pp. 1093-1102, 2024, DOI:10.32604/fdmp.2024.050059
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract Ultrasonic baths and sonochemical reactors are widely used in industrial applications dealing with surface cleaning and chemical synthesis. The processes of erosion, cleaning and structuring of the surface can be typically controlled by changing relevant influential parameters. In particular, in this work, we experimentally investigate the effect of NaCl concentration (0–5.5 mol/L) on the erosion of an aluminum foil under ultrasonic exposure at a frequency of 28 kHz. Special attention is paid to the determination of cavitation zones and their visualization using heat maps. It is found that at low NaCl concentration (0.3 mol/L), the More >

    Graphic Abstract

    Investigation of Cavitation in NaCl Solutions in a Sonochemical Reactor Using the Foil Test Method

  • Open Access

    ARTICLE

    Linear and Non-Linear Dynamics of Inertial Waves in a Rotating Cylinder with Antiparallel Inclined Ends

    Mariya Shiryaeva, Mariya Subbotina, Stanislav Subbotin
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.4, pp. 787-802, 2024, DOI:10.32604/fdmp.2024.048165
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract This work is devoted to the experimental study of inertial wave regimes in a non-uniform rotating cylinder with antiparallel inclined ends. In this setting, the cross-section of the cylinder is divided into two regions where the fluid depth increases or decreases with radius. Three different regimes are found: inertial wave attractor, global oscillations (the cavity’s resonant modes) and regime of symmetric reflection of wave beams. In linear wave regimes, a steady single vortex elongated along the rotation axis is generated. The location of the wave’s interaction with the sloping ends determines the vortex position and More >

  • Open Access

    ARTICLE

    Formation of Water Quality of Surface Water Bodies Used in the Material Processing

    Tatyana Lyubimova, Anatoly Lepikhin, Yanina Parshakova, Irina Zayakina, Alibek Issakhov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.4, pp. 815-828, 2024, DOI:10.32604/fdmp.2024.048463
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract In the process of production or processing of materials by various methods, there is a need for a large volume of water of the required quality. Today in many regions of the world, there is an acute problem of providing industry with water of a required quality. Its solution is an urgent and difficult task. The water quality of surface water bodies is formed by a combination of a large number of both natural and anthropogenic factors, and is often significantly heterogeneous not only in the water area, but also in depth. As a rule,… More >

  • Open Access

    ARTICLE

    Averaged Dynamics of Fluids near the Oscillating Interface in a Hele-Shaw Cell

    Anastasia Bushueva, Olga Vlasova, Denis Polezhaev
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.4, pp. 847-857, 2024, DOI:10.32604/fdmp.2024.048271
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The steady flow in a Hele-Shaw cell filled with fluids with a high viscosity contrast in the presence of fluid oscillations is experimentally studied. The control of oscillatory dynamics of multiphase systems with interfaces is a challenging technological problem. We consider miscible (water and glycerol) and immiscible (water and high-viscosity silicone oil PMS-1000) fluids under subsonic oscillations perpendicular to the interface. Observations show that the interface shape depends on the amplitude and frequency of oscillations. The interface is undisturbed only in the absence of oscillations. Under small amplitudes, the interface between water and glycerol widens… More >

  • Open Access

    ARTICLE

    Dynamics of Low-Viscosity Liquids Interface in an Unevenly Rotating Vertical Layer

    Victor Kozlov, Vladimir Saidakov, Nikolai Kozlov
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.4, pp. 693-703, 2024, DOI:10.32604/fdmp.2024.048068
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The behavior of two immiscible low-viscosity liquids differing in density and viscosity in a vertical flat layer undergoing modulated rotation is experimentally studied. The layer has a circular axisymmetric boundary. In the absence of modulation of the rotation speed, the interphase boundary has the shape of a short axisymmetric cylinder. A new effect has been discovered, under the influence of rotation speed modulation, the interface takes on a new dynamic equilibrium state. A more viscous liquid covers the end boundaries of the layer in the form of thin films, which have the shape of round… More >

  • Open Access

    ARTICLE

    Influence of Bottom Inclination on the Flow Structure in a Rotating Convective Layer

    Andrei Vasiliev, Andrei Sukhanovskii, Elena Popova
    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.4, pp. 739-748, 2024, DOI:10.32604/fdmp.2024.048092
    (This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract The formation of convective flows in a rotating cylindrical layer with an inclined bottom and free surface is studied. Convection is driven by localized cooling at the center of the upper free surface and by rim heating at the bottom near the sidewall. The horizontal temperature difference in a rotating layer leads to the formation of a convective flow with a complex structure. The mean meridional circulation, consisting of three cells, provides a strongly non-uniform differential rotation. As a result of the instability of the main cyclonic zonal flow, the train of baroclinic waves appears… More >

Share Link