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Effect of Confinement of Flow by Side Walls on the Cross Flow past a Circular Cylinder at Moderate Reynolds Numbers 中等雷诺数下侧壁约束对圆柱横流的影响
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601905
O. A. Dushina, E. I. Kalinin, M. A. Klyuev, A. B. Mazo, V. M. Molochnikov
{"title":"Effect of Confinement of Flow by Side Walls on the Cross Flow past a Circular Cylinder at Moderate Reynolds Numbers","authors":"O. A. Dushina,&nbsp;E. I. Kalinin,&nbsp;M. A. Klyuev,&nbsp;A. B. Mazo,&nbsp;V. M. Molochnikov","doi":"10.1134/S0015462822601905","DOIUrl":"10.1134/S0015462822601905","url":null,"abstract":"<p>The effect of confinement of flow over the transversal coordinate on cross flow past a circular cylinder at the Reynolds numbers from 40 to 255 (based on the cylinder diameter and the undisturbed flow velocity) is studied numerically and experimentally. In the experiments, the cylinder was located in a rectangular channel and, in the case of numerical simulation, three types of the boundary conditions, namely, the periodic boundary conditions and the slip and no-slip conditions were imposed on the side walls confining the flow. Particular attention is concentrated on the vertical flow structure in the cylinder wake. It is shown that spiral vortices that travel in the plane of symmetry of the channel are formed only in the case of no-slip boundary conditions in the region of junction of the cylinder and the side walls. Under their interaction, vortex clusters are formed in the center of channel and some indications to flow turbulization can be observed in the wake. Under the periodic boundary conditions and the slip conditions on the side walls, there are no spiral vortices and, in the Re range from 200 to 250, the A and B modes of three-dimensional instability and turbulence transition are implemented in the cylinder wake. The effect of the channel width and the type of boundary conditions on the side walls on the vortex wake structure behind the cylinder and integral flow parameters is estimated.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"84 - 100"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4098420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interaction of the Supersonic Stellar Wind with Free Stream of the Interstellar Medium: the Effect of the Azimuthal Magnetic Field of the Star 超音速恒星风与星际介质自由流的相互作用:恒星方位磁场的影响
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601826
S. D. Korolkov, V. V. Izmodenov
{"title":"Interaction of the Supersonic Stellar Wind with Free Stream of the Interstellar Medium: the Effect of the Azimuthal Magnetic Field of the Star","authors":"S. D. Korolkov,&nbsp;V. V. Izmodenov","doi":"10.1134/S0015462822601826","DOIUrl":"10.1134/S0015462822601826","url":null,"abstract":"<p>The problem of the interaction of a hypersonic stellar wind with the surrounding interstellar medium is considered. The media are assumed to be fully ionized and are accounted for within the framework of ideal magnetohydrodynamics. The scientific novelty of the study consists in taking into account the star’s magnetic field. The magnetic field modifies qualitatively the shape of the astropause under certain flow parameters. The astropause is a tangential discontinuity that separates the stellar wind from the interstellar medium. Instead of the classical paraboloidal shape, the astropause acquires a tube (or cylindrical) shape. It is shown that the tube shape takes place for slowly moving stars or, in the star’s coordinate system, for free streams with the Mach number M<sub>∞</sub> less than a threshold one. The flow regime bifurcates and the astropause changes the shape from the tube to the classical one when a threshold flow Mach number <span>({text{M}}_{infty }^{*})</span> is reached. For stars with the strong magnetic field, the bifurcation takes place at the higher Mach numbers as compared with stars with the weak magnetic field. It is also shown that one more qualitative flow restructuring occurs at M<sub>∞</sub> = 1. In this case, the astropause shape does not change, but a bow shock and a Mach disk are formed.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"9 - 18"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4098515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using the Wave Propulsors in a Small-Waterplane-Area-Twin-Hull Boat 波浪推进器在小水线面双壳船中的应用
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601929
V. V. Prokofiev, E. A. Arkhangelsky, A. V. Boyko, E. V. Filatov
{"title":"Using the Wave Propulsors in a Small-Waterplane-Area-Twin-Hull Boat","authors":"V. V. Prokofiev,&nbsp;E. A. Arkhangelsky,&nbsp;A. V. Boyko,&nbsp;E. V. Filatov","doi":"10.1134/S0015462822601929","DOIUrl":"10.1134/S0015462822601929","url":null,"abstract":"<p>The efficiency of two types of wave propulsors (WPs) (a swinging spring-loaded wing WP and a direct-flow WP) is experimentally studied on a model of a small-waterplane-area-twin-hull (SWATH) boat. The NACA0015 airfoil was used as an operating element of both the swinging and the direct-flow WPs. In the case of a direct-flow WP, the flat airfoil was rigidly fixed relative to the boat hull with a chord inclination of 30°. The operating efficiency of the wave propulsors is studied for waves of various lengths depending on the draft of the SWATH boat hulls, and in the case of a swinging spring-loaded wing WP, also on the submergence depth of the propulsor. Using the results of towing tests, the thrust force of a direct-flow WP is estimated under various operating conditions. It is found that with increase in the submergence depth of the boat hulls, the efficiency of the direct-flow WP increases, while the efficiency of the swinging WP decreases, however, it largely retains its operability, provided that the WP operating element remains at the optimal depth close to the water surface.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"19 - 30"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4097340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Lift Airfoils Close to the Airfoils in a Flow with the Maximum “Critical” Mach Numbers 在最大“临界”马赫数的流动中升力翼型接近翼型
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822700057
A. N. Kraiko, V. A. Shapovalov
{"title":"Lift Airfoils Close to the Airfoils in a Flow with the Maximum “Critical” Mach Numbers","authors":"A. N. Kraiko,&nbsp;V. A. Shapovalov","doi":"10.1134/S0015462822700057","DOIUrl":"10.1134/S0015462822700057","url":null,"abstract":"<p>The lift airfoils close to the airfoils optimal with respect to the critical Mach numbers М* of two-dimensional bodies optimal with respect to М* are constructed using the direct method. Their almost zero wave drag coefficients <i>с</i><sub><i>х</i></sub> remain the same not only at the free-stream Mach numbers М<sub>0</sub> which are lower than М* but also at М<sub>0</sub> perceptibly higher than М*. These new lift airfoils differ from the supercritical lift airfoils whose <i>с</i><sub><i>х</i></sub> grow extremely rapidly when М<sub>0</sub> becomes higher than the designed values. At identical thicknesses and М<sub>0</sub> = М* the supercritical lift airfoils implement the greater lift coefficients <i>с</i><sub><i>у</i></sub>. However, due to the difference in the behavior of <i>с</i><sub><i>х</i></sub> at М<sub>0</sub> which are higher than the designed ones, the lift-drag ratio of the supercritical airfoils can become lower for the ratio of <i>с</i><sub><i>у</i></sub> not to <i>с</i><sub><i>х</i></sub>, but even to the coefficient of total drag.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"128 - 135"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4097038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-Equilibrium Supersonic Flow Past a Blunt Plate at High Angle of Attack 大迎角下非平衡超声速流过钝板
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822700033
S. T. Surzhikov
{"title":"Non-Equilibrium Supersonic Flow Past a Blunt Plate at High Angle of Attack","authors":"S. T. Surzhikov","doi":"10.1134/S0015462822700033","DOIUrl":"10.1134/S0015462822700033","url":null,"abstract":"<p>The computational model designed for studying the processes of non-equilibrium physicochemical gas dynamics in supersonic rarefied-air flow past a blunt plate of finite dimensions under the laboratory experiment conditions is formulated. The computational model is based on the two-dimensional Navier–Stokes equations, the energy conservation laws for the translational degrees of freedom of atoms and molecules and the vibrational degrees of freedom of diatomic molecules, and the chemical kinetics and diffusion equations for individual components of partially ionized gas flow. The basic gas dynamic and kinetic processes in flow past a blunt plate are analyzed at the Mach numbers M = 10 and 20. It is shown that regions of thermal nonequilibrium are formed.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"113 - 127"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0015462822700033.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4097047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Simulation of Turbulent Flow Control at Pipe Inlet to Advance Flow Relaminarization 推进流动再分层的管道入口湍流控制数值模拟
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601954
V. G. Lushchik, M. S. Makarova, A. I. Reshmin
{"title":"Numerical Simulation of Turbulent Flow Control at Pipe Inlet to Advance Flow Relaminarization","authors":"V. G. Lushchik,&nbsp;M. S. Makarova,&nbsp;A. I. Reshmin","doi":"10.1134/S0015462822601954","DOIUrl":"10.1134/S0015462822601954","url":null,"abstract":"<p>Various methods of flow relaminarization in a pipe are considered by means of controlling the average and turbulent flow parameters. For numerical simulation of flows with turbulence growth and suppression it is proposed to use a three-parameter RANS turbulence model, which has shown good results in modeling existing experiments on relaminarization. Calculations for three variants of inlet devices with different velocity profiles and the same small-scale turbulence at the inlet show the possibility of achieving flow relaminarization in pipes at Reynolds numbers Re &gt; 10 000. Among three variants of inlet devices considered, the most effective one is the variant with organization of a two-zone flow with slow flow in the central region of the pipe and accelerated flow in the near-wall region. In this version, relaminarization occurs up to the Reynolds number Re* = 16 000. It is shown that decrease in the turbulence intensity and scale leads to an even larger value of the relaminarization Reynolds number Re*.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"57 - 71"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0015462822601954.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4097046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Formation of Shock-Wave Flow during Nanosecond Discharge Localization in Unsteady Flow in a Channel with Obstacles 有障碍物通道内非定常流纳秒放电局部化过程中激波流的形成
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601917
D. I. Dolbnya, I. A. Znamenskaya, A. E. Lutsky, N. N. Sysoev
{"title":"Formation of Shock-Wave Flow during Nanosecond Discharge Localization in Unsteady Flow in a Channel with Obstacles","authors":"D. I. Dolbnya,&nbsp;I. A. Znamenskaya,&nbsp;A. E. Lutsky,&nbsp;N. N. Sysoev","doi":"10.1134/S0015462822601917","DOIUrl":"10.1134/S0015462822601917","url":null,"abstract":"<p>The results of studies of the effect of volume and surface pulse discharges on high-speed gas flow in a rectangular shock-tube channel with a change in the profile (obstacle on the lower wall) are given. A single nanosecond surface discharge or a discharge with preionization induced by the plasma electrodes (combined discharge) was initiated in flow downstream of the shock wave with the Mach numbers M<sub>s</sub> = 3.2–3.4. The obstacle determines the distribution of the parameters of flow past the obstacle and the pulse discharge plasma redistribution. The density fields of gas dynamic flow under the experimental conditions are obtained and compared with the discharge plasma distribution. It is shown that the shock-wave effect of the discharge on flow behind the obstacle continued from 25 to 70 µs.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"145 - 151"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4098221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Duality of the Stream Pattern of Supersonic Viscous Gas Flow past a Blunt-Fin Junction: the Effect of a Low Sweep Angle 超声速粘性气体经过钝鳍结时流型的对偶性:低掠角的影响
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601887
E. V. Kolesnik, E. M. Smirnov
{"title":"Duality of the Stream Pattern of Supersonic Viscous Gas Flow past a Blunt-Fin Junction: the Effect of a Low Sweep Angle","authors":"E. V. Kolesnik,&nbsp;E. M. Smirnov","doi":"10.1134/S0015462822601887","DOIUrl":"10.1134/S0015462822601887","url":null,"abstract":"<p>The results of numerical solution of the problem of supersonic flow past a symmetric blunt fin mounted on a plate along which the boundary layer is developed are given. The initial formulation of the problem is based on the computational and experimental investigation by Tutty et al. (2013) in which the laminar flow regime was studied for the fin perpendicular to the plate at the free-stream Mach number equal to 6.7. Earlier, the authors have shown (2020) that under these conditions there exist two stable solutions of the problem. These solutions correspond to the metastable states of flow with different configurations of the vortex structure and different patterns of local heat transfer. In present study, the influence of a low sweep angle of the blunt leading edge on the vortex structure in the separation region, local heat transfer, and the possibility of obtaining a dual solution are investigated. The bifurcation diagrams that determine the location of the center of main horseshoe vortex in the plane of symmetry and the length of separation domain as a function of the skew angle are presented for two solutions.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"1 - 8"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4098412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Nonlinear Schrödinger Equation for Gravity-Capillary Waves on Deep Water with Constant Vorticity 等涡量深水重力-毛细波非线性Schrödinger方程
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601851
M. I. Shishina
{"title":"A Nonlinear Schrödinger Equation for Gravity-Capillary Waves on Deep Water with Constant Vorticity","authors":"M. I. Shishina","doi":"10.1134/S0015462822601851","DOIUrl":"10.1134/S0015462822601851","url":null,"abstract":"<p>The surface gravity-capillary waves on deep water with constant vorticity in the region bounded by the free surface and the infinitely deep plane bottom are considered. A nonlinear Schrödinger equation is derived from a system of exact nonlinear integro-differential equations in conformal variables written in the implicit form taking into account surface tension. In deriving the nonlinear Schrödinger equation, the role of the mean flow is taken into account. The nonlinear Schrödinger equation is investigated for modulation instability. A soliton solution of the nonlinear Schrödinger equation that represents a soliton of the “ninth wave” type is obtained.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"72 - 83"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4098409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Mass Transfer from a Drop in Fall into the Fluid Thickness in the Initial Stage of the Coalescence Process 在聚结过程的初始阶段，流体厚度下降的传质
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-05-02 DOI: 10.1134/S0015462822601607
A. Yu. Il’inykh, Yu. D. Chashechkin
{"title":"Mass Transfer from a Drop in Fall into the Fluid Thickness in the Initial Stage of the Coalescence Process","authors":"A. Yu. Il’inykh,&nbsp;Yu. D. Chashechkin","doi":"10.1134/S0015462822601607","DOIUrl":"10.1134/S0015462822601607","url":null,"abstract":"<p>High-speed videorecording is used to trace the fine structure evolution in the case of freely falling drop matter propagation beneath the deformed surface of a fluid, initially at rest. The coalescence of a water drop with ammonium rhodanide solution and drops of sodium chloride solution, sodium carbonate, and ink with water is studied. In the initial stage of the coalescence process occurring in the impact regime with rapid cavity formation the drop loses the continuity. Short thin jetlets penetrating the cavity bottom are visualized for the first time. The earlier-observed drop disintegration into thin fibers that form linear or reticular structures on the cavity and crown surfaces is confirmed. The jetlets that contain the drop matter merge gradually and form an intermediate fibrous layer embracing the cavity; this layer possesses a well-defined outer boundary. As the cavity enlarges, the intermediate layer homogenizes and becomes thinner. Further on, in the process of cavity collapse new fiber groups are formed in the target fluid; they penetrate the cavity boundary beneath the grid nodes. In the experiments performed the fibrous layer embracing the primary cavity was observable, when a fluid of greater density (ink, sodium carbonate, or sodium chloride solution drops) intruded into a less dense medium (water) or when a fluid of smaller density (water droplets) was introduced into a heavier fluid (ammonium rhodanide solution). The fibrous shell of the primary cavity becomes thicker with increase in the drop velocity.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 1","pages":"31 - 44"},"PeriodicalIF":0.9,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4097336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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