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Peculiarities of the Interstellar Dust Distribution in the Heliosphere Induced by the Time-Dependent Magnetic Field 随时间变化的磁场诱发的日光层星际尘埃分布的特殊性
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462824602298
E. A. Godenko, V. V. Izmodenov
{"title":"Peculiarities of the Interstellar Dust Distribution in the Heliosphere Induced by the Time-Dependent Magnetic Field","authors":"E. A. Godenko,&nbsp;V. V. Izmodenov","doi":"10.1134/S0015462824602298","DOIUrl":"10.1134/S0015462824602298","url":null,"abstract":"<div><p>Interstellar dust enters the heliosphere due to the relative motion of the Sun and the Local Interstellar Cloud, which contains the Sun. The dynamics of interstellar dust particles is governed mainly by the electromagnetic force. The direction of this force depends on the polarity of the heliospheric magnetic field. In turn, polarity is a function of position and time and depends on the orientation of the solar magnetic dipole axis relative to the solar rotation axis. Previously it was shown that for the case when the magnetic dipole axis coincides with the solar rotation axis, the electromagnetic force acting on dust particles is directed towards the solar equatorial plane in both the northern and southern solar hemispheres. As a result, under the influence of such a force, the distribution of interstellar dust becomes highly inhomogeneous and, in particular, thin regions of increased number density (caustics) are formed. The goal of this work is to study the nature of caustics for a more realistic time-dependent model, when it is assumed that the magnetic dipole axis rotates relative to the solar rotation axis with a period of 22 years in accordance with the 22-year solar cycle. In addition, the magnetic dipole axis rotates due to the rotation of the Sun with a period of 25 days. To calculate the dust number density, the Lagrangian Osiptsov method is used. The shape and evolution of the resulting caustics are examined and the physical mechanisms of their origin are discussed. It is shown that, when taking into account time-dependent effects, caustics appear only in certain phases of the 22-year solar cycle, and then disappear.</p></div>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"521 - 532"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0015462824602298.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572244","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
Electric Field Effect on the Dynamics of the Structural Flow Components in the Case of Gravity-Induced Separation of a Water Drop 电场对重力诱导水滴分离情况下结构流成分动力学的影响
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462824602419
Yu. D. Chashechkin, V. E. Prokhorov
{"title":"Electric Field Effect on the Dynamics of the Structural Flow Components in the Case of Gravity-Induced Separation of a Water Drop","authors":"Yu. D. Chashechkin,&nbsp;V. E. Prokhorov","doi":"10.1134/S0015462824602419","DOIUrl":"10.1134/S0015462824602419","url":null,"abstract":"<p>The high-speed videorecording method is used to investigate the effect of an electrostatic field (with the potential Φ = 0, 16, and 18 kV) on the flow geometry in the case of gravity-induced separation of a drop from a capillary tube. The flow videograms are analyzed and the dimensions of the characteristic structural elements, that is, the drops themselves, a bridge, and satellites, are determined. The oscillations of the linear dimensions and the mother liquid volume after drop separation are traced at <span>(Phi = )</span> 0 and 18 kV. Both fundamental frequencies and their harmonics are observable in the spectra. It is found that small (12%) variations in the potential value lead to qualitative variations in the flow pattern and, in particular, to direct separation of the drop from the mother liquid without the formation of a bridge. At a constant liquid discharge in the capillary the dimensions of the separated drops decrease with increase of the voltage. The experiments show the possibility of the fine controlling of drop flows using electrostatic fields.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"401 - 414"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572242","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
Numerical Simulation of Tollmien–Schlichting Wave Generation by Flow Turbulence 流动湍流产生托尔米安-施利克廷波的数值模拟
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462823603315
M. V. Ustinov
{"title":"Numerical Simulation of Tollmien–Schlichting Wave Generation by Flow Turbulence","authors":"M. V. Ustinov","doi":"10.1134/S0015462823603315","DOIUrl":"10.1134/S0015462823603315","url":null,"abstract":"<p>The disturbances generated by external turbulence in the shear layer on a flat plate suddenly set in motion are found. As the initial conditions, turbulent flow found using direct numerical simulation of the development of isotropic homogeneous turbulence is used. The solution obtained models laminar-turbulent transition in the boundary layer on a flat plate under relatively low free-stream turbulence when the transition is caused by Tollmien–Schlichting waves. The solution makes it possible to describe the process of generating various disturbances, namely, low-frequency streaky structures and instability waves and also their development in the initial stage of laminar-turbulent transition. Based on the processing of the obtained results, a simple model is proposed that relates the spectra of instability waves in the boundary layer and turbulent pulsations in free-stream flow. The dependences of the initial amplitude of instability waves and their critical amplification factors (<i>N</i>-factors) on the degree of flow turbulence are also obtained.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"488 - 503"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572241","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
Asymptotic Analysis of the Inflow to a Fracture in an Oil–Gas Reservoir with Bottom Water 含底层水油气藏裂缝入流的渐近分析
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462824602225
R. D. Kanevskaya, P. V. Kuznetsov, L. L. Ryzhova
{"title":"Asymptotic Analysis of the Inflow to a Fracture in an Oil–Gas Reservoir with Bottom Water","authors":"R. D. Kanevskaya,&nbsp;P. V. Kuznetsov,&nbsp;L. L. Ryzhova","doi":"10.1134/S0015462824602225","DOIUrl":"10.1134/S0015462824602225","url":null,"abstract":"<p>A model of oil inflow to a well in a fractured reservoir with a vast gas cap and an underlying water layer is presented in the conditions of gravity-induced segregation of fluids. Using an asymptotic analysis of the equations it was possible to simplify the description of the seepage process before and after the water and gas breakthrough into the well and at a distance from it, as well as to estimate the possibility of waterless and gasless extraction in the conditions of the stabilization of phase fractions in the total rate. It is shown that the hydrostatic equilibrium model can be used in the large-scale approximation fairly far from the well. It is noted that in most practical cases the finite-conductance effect of a fracture is negligible in the large-scale approximation, so that the model of an infinitely permeable fracture can be applied. The equations for determining gas and water fractions in the production after the breakthrough of the water and gas cones in the vicinity of the sink were derived on the flow scale. Finally, the coupling of the models presented makes it possible to describe adequately the inflow to the well before and after the breakthrough of the water and gas cones. The plausibility of the models presented is confirmed by the comparison of the calculated results with the actual data.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"533 - 545"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572443","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
Numerical Simulation of the Drag Crisis on a Sphere Using a Scale-Resolving Approach 采用尺度解析法对球体上的阻力危机进行数值模拟
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462823603248
A. S. Stabnikov, A. V. Garbaruk, M. Kh. Strelets
{"title":"Numerical Simulation of the Drag Crisis on a Sphere Using a Scale-Resolving Approach","authors":"A. S. Stabnikov,&nbsp;A. V. Garbaruk,&nbsp;M. Kh. Strelets","doi":"10.1134/S0015462823603248","DOIUrl":"10.1134/S0015462823603248","url":null,"abstract":"<p>The drag crisis in flow past a sphere is modeled within the framework of the recently formulated scale-resolving hybrid RANS−LES approach, which includes a semi-empirical model of laminar-turbulent transition. The calculations performed in a wide Reynolds number range show that the complex model used yields a qualitatively adequate description of all aspects of the drag crisis including such fine effects, as the growth of the side force oscillation amplitude at near-critical Reynolds numbers. At the same time, the results obtained indicate that very fine computation grids should be used for obtaining qualitatively accurate predictions of the critical Reynolds number and the details of laminar-turbulent transition in near-critical flow regimes.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"465 - 478"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572445","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
Experimental and Numerical Investigation of the Cavitation-Induced Suction Effect 空化诱发的吸力效应的实验和数值研究
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462824600342
A. I. Ukolov, V. P. Rodionov
{"title":"Experimental and Numerical Investigation of the Cavitation-Induced Suction Effect","authors":"A. I. Ukolov,&nbsp;V. P. Rodionov","doi":"10.1134/S0015462824600342","DOIUrl":"10.1134/S0015462824600342","url":null,"abstract":"<p>The generation of the suction force between a rigid cylindrical frame constricting a submerged cavitating jet and a solid surface is considered. The separation force needed to overcome the suction effect is experimentally determined in a specially developed setup. The dependences of the suction force on the frame diameter and the distance from the nozzle cavitator are obtained using numerical modeling. The volume fraction of the vapor phase inside the frame and the static pressure along the suction surface are calculated. The mechanism of the appearance of the effect and the criteria of its vanishing are explained on the basis of the data obtained.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"392 - 400"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572236","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
Three-Dimensional Continuum Model of Lumen Formation in a Cluster of Cells Immersed in an Extracellular Matrix: The Role of Mechanical Factors 浸泡在细胞外基质中的细胞团腔形成的三维连续模型：机械因素的作用
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462824600299
S. A. Logvenkov
{"title":"Three-Dimensional Continuum Model of Lumen Formation in a Cluster of Cells Immersed in an Extracellular Matrix: The Role of Mechanical Factors","authors":"S. A. Logvenkov","doi":"10.1134/S0015462824600299","DOIUrl":"10.1134/S0015462824600299","url":null,"abstract":"<p>The extent of participation of mechanisms such as the active interactions of cells with each other and with the extracellular matrix, the increased hydrostatic pressure in intercellular fluid, and enzymatic activity of cells that lead to the destruction of the extracellular matrix in the process of formation of cavities in clusters of cells formed during cluster vasculogenesis is studied. The problem of evolution of a single cluster of cells immersed in a deformable extracellular matrix is solved within the framework of a previously developed continuum multiphase model of the medium formed by two actively interacting solid phases and a fluid and the role of various cellular mechanisms discussed in the formation of hollow structures is studied. The calculations showed that the dominance of active interactions of the cell-matrix type over the intercellular interactions leads to a displacement of cells towards the outer boundary of the cluster and the creation of conditions for the formation of a cavity inside the cluster. The enzymatic activity of cells helps to free up a headroom for compaction of the cluster, due to the active intercellular interactions, and to slow down the formation of the increasing concentration profile of the cellular phase. An increase in the fluid pressure in the area occupied by cells leads to acceleration of the redistribution of concentrations of the cellular phase and matrix. The fluid pressure promotes accumulation of the cellular phase near the cluster boundary and increase in the matrix concentration in its central part. And only the joint participation of all the mechanisms considered leads to the formation of a structure in which a layer formed by the cellular phase surrounds a fluid-occupied cavity, while the matrix concentration in the cavity demonstrates the trend to its complete disappearance.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"377 - 391"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572235","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
Regimes of Displacement from an Anisotropic Formation during Injection of Fluid through a Vertical Well 各向异性地层在垂直井注入流体过程中的位移状态
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462824602250
A. I. Andreeva, A. A. Afanasyev
{"title":"Regimes of Displacement from an Anisotropic Formation during Injection of Fluid through a Vertical Well","authors":"A. I. Andreeva,&nbsp;A. A. Afanasyev","doi":"10.1134/S0015462824602250","DOIUrl":"10.1134/S0015462824602250","url":null,"abstract":"<p>The regimes of fluid displacement from a formation developed by a system of vertical wells are studied within the framework of the cross-sectional problem of flow through a porous medium. The case of an anisotropic formation in which the effect of buoyancy of the displacing fluid is significant is considered. It is shown that in the generic case the displacement process is characterized by five similarity criteria, one of them determines the intervals of fluid flow from the well to the formation. The limiting cases of the displacement regimes in which the number of constitutive similarity parameters can be reduced are described. The influence of these parameters on the recovery factor and the sweep efficiency is studied. A diagram of displacement regimes that constrains the areas of influence of the similarity criteria and the revealed limiting cases is constructed. The results of the present study may be useful in the oil and gas industry in estimating the efficiency of various field development methods.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"504 - 520"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572444","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
Turbulent Swirled Wall Jets 湍流漩涡壁式喷流
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-07-05 DOI: 10.1134/S0015462824602833
A. M. Gaifullin, A. S. Shcheglov
{"title":"Turbulent Swirled Wall Jets","authors":"A. M. Gaifullin,&nbsp;A. S. Shcheglov","doi":"10.1134/S0015462824602833","DOIUrl":"10.1134/S0015462824602833","url":null,"abstract":"<p>Numerical simulation is applied to investigate the outflow of an incompressible three-dimensional turbulent swirled wall jet. The purpose of the study is to determine the jet flow structure and to compare the characteristics of swirled and nonswirled jets. The numerical solution of the equations of motion is obtained using large eddy simulation with wall resolution (WRLES). The results of the modeling are compared with the data of a unique published study devoted to experimental investigation of swirled wall jets.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 3","pages":"479 - 487"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572243","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
Asymptotic Study of Flows Induced by Oscillations of Cylindrical Bodies 圆柱形物体振荡引起的流动的渐近研究
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462824602110
A. N. Nuriev, O. N. Zaitseva, A. M. Kamalutdinov, E. E. Bogdanovich, A. R. Baimuratova
{"title":"Asymptotic Study of Flows Induced by Oscillations of Cylindrical Bodies","authors":"A. N. Nuriev,&nbsp;O. N. Zaitseva,&nbsp;A. M. Kamalutdinov,&nbsp;E. E. Bogdanovich,&nbsp;A. R. Baimuratova","doi":"10.1134/S0015462824602110","DOIUrl":"10.1134/S0015462824602110","url":null,"abstract":"<p>Hydrodynamic flows induced by translational oscillations of cylindrical bodies of various cross-sectional shapes are studied. The motion of fluid around oscillating bodies is described using the system of Navier–Stokes equations written in a generalized curvilinear coordinate system. Transition to a given body shape is implemented using a conformal mapping. The problem is solved using the method of successive asymptotic expansions under the assumption that the oscillation amplitudes are small. In each asymptotic approximation, the subproblems are solved numerically using the finite-difference method. Based on the results of the work, estimates of the hydrodynamic effect are obtained, the applicability of the high-frequency asymptotic approximation is estimated, and secondary stationary flows near cylinders are studied, in particular, the occurrence of directed stationary flows near an oscillating asymmetric body is considered with reference to the Joukowski airfoil.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"314 - 330"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0015462824602110.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939894","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
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