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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
Development of the Wave Motion Induced by Near-Bottom Periodic Disturbances in a Two-Layer Shear Current 两层剪切流中近底周期性扰动诱发的波浪运动的发展过程
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462824602122
I. V. Sturova
{"title":"Development of the Wave Motion Induced by Near-Bottom Periodic Disturbances in a Two-Layer Shear Current","authors":"I. V. Sturova","doi":"10.1134/S0015462824602122","DOIUrl":"10.1134/S0015462824602122","url":null,"abstract":"<p>The behavior of wave motion arising in an ideal incompressible homogeneous fluid under switching-on periodic bottom disturbances is studied in the linear approximation for the two-dimensional non-stationary problem. In the undisturbed state, the velocities of two-layer fluid flow are linear functions of the vertical coordinate in each of the layers with different gradients and coincide on the boundary of the layers. The upper boundary of fluid can be either free or bounded by the rigid cover. The dispersion dependences and the group velocities of the appearing wave modes are determined. The vertical displacements of the free surface and the interface between the layers are calculated. A comparison with the solution for a single-layer fluid is carried out.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"225 - 237"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939739","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
Nonlinear Regimes of Electric Convection of Poorly Conducting Fluids in Weightlessness at Low Frequencies of an Electric Field 失重状态下不良导电流体在低频电场中的非线性对流状态
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462823603273
V. A. Il’in
{"title":"Nonlinear Regimes of Electric Convection of Poorly Conducting Fluids in Weightlessness at Low Frequencies of an Electric Field","authors":"V. A. Il’in","doi":"10.1134/S0015462823603273","DOIUrl":"10.1134/S0015462823603273","url":null,"abstract":"<p>Electrothermal convection in a poorly conducting fluid in an alternating electric field of a horizontal capacitor is studied. The nonlinear regimes of electric convection in weightlessness are studies at low frequencies of the electric field on the basis of the pentamodal model within the framework of the electroconductive charge formation mechanism. Hysteresis transitions between two different synchronous and subharmonic regimes are found to exist. Transitions to chaos occur by means of either interemittance or a subharmonic cascade.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"183 - 188"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939850","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
The Initial Stage of the Coalescence of a Compound Drop in an Impact Regime 复合水滴在撞击状态下凝聚的初始阶段
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462824600226
Yu. D. Chashechkin, A. Yu. Il’inykh, Sh. Kh. Khaiirbekov
{"title":"The Initial Stage of the Coalescence of a Compound Drop in an Impact Regime","authors":"Yu. D. Chashechkin,&nbsp;A. Yu. Il’inykh,&nbsp;Sh. Kh. Khaiirbekov","doi":"10.1134/S0015462824600226","DOIUrl":"10.1134/S0015462824600226","url":null,"abstract":"<p>The evolution of the regular fine structure of the colored matter distribution produced, when a freely falling multifluid drop spreads in deep water, is for the first time traced using the techniques of engineering photo and video recording. The flow pattern is studied in the initial stage of the formation of a cavity and a crown during the coalescence of a compound drop, whose core is a drop of alizarin ink solution coated with an oil shell. The distributions of the colored fluid at the cavity bottom and the crown walls include streaky structures, whose formation can be due to the processes of the available potential surface energy (APSE) conversion occurring when the contact surfaces of the merging fluids are eliminated. In the experiments the height of the falling drop was varied. The core position in the compound drop was not checked but was determined by separation conditions. The ink core disintegration into fibers was observable in all the experiments. The areas of the cavity and crown surfaces covered by the colored fluid reached maximum at the central position of the core.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"202 - 218"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939750","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
Estimate of the Onset of Laminar-Turbulent Transition on a Plate in Flight in the Mars Atmosphere 估计火星大气中飞行板块上层流-湍流转变的起始时间
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462823603212
Yu. N. Grigor’ev, I. V. Ershov
{"title":"Estimate of the Onset of Laminar-Turbulent Transition on a Plate in Flight in the Mars Atmosphere","authors":"Yu. N. Grigor’ev,&nbsp;I. V. Ershov","doi":"10.1134/S0015462823603212","DOIUrl":"10.1134/S0015462823603212","url":null,"abstract":"<p>Comparative calculations of the location of the onset of the laminar-turbulent transition zone are performed using the e<sup><i>N</i></sup>-method for two points on the Mars “Pathfinder” entry trajectory. A three-component model of thermochemically nonequilibrium CO<sub>2</sub>–CO–O mixture is used in the calculations. The set of spatial disturbance frequencies is found using neutral curves for the first unstable modes of temporary disturbances. The transition Reynolds number Re<sub>δ<i>T</i></sub> is determined from the envelopes of families of <i>N</i>-factor curves at <i>N</i><sub><i>T</i></sub> = 8. In the hypersonic regime at M = 12.6, taking into account the developed thermochemical nonequilibrium leads to a significant decrease in the static temperature of gas in the lower part of the boundary layer. As a result, the onset of the laminar-turbulent transition zone is displaced downstream by approximately 9% as compared to the case of a perfect gas.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"169 - 182"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939847","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
Self-Similar Solution of the First Stokes Problem for Non-Newtonian Fluids with Power-Law Viscosity 具有幂律粘度的非牛顿流体的第一斯托克斯问题的自相似解
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462824602134
V. N. Kolodezhnov
{"title":"Self-Similar Solution of the First Stokes Problem for Non-Newtonian Fluids with Power-Law Viscosity","authors":"V. N. Kolodezhnov","doi":"10.1134/S0015462824602134","DOIUrl":"10.1134/S0015462824602134","url":null,"abstract":"<p>The first Stokes problem is considered for flows of non-Newtonian fluids with effective viscosity varying in accordance with the power law. Self-similar solutions are constructed for the fluids, whose mechanical behavior is described by the Ostwald–de Waele and Herschel–Bulkley rheological models with the corresponding restrictions on the nonlinearity degree exponent <i>n</i>. It is shown that for the Ostwald–de Waele fluid self-similar solutions exist only for 0 <i>&lt; n &lt;</i> 1, which corresponds to the pseudoplastic behavior. At the same time, self-similar solutions for the Herschel–Bulkley fluid can be obtained only at <i>n &gt;</i> 1, when this fluid exhibits the properties of dilatancy.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"219 - 224"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939849","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
Gas Suction Effect on the Crossflow Instability in Flow Past a Swept Wing 气体吸力对掠翼流过时横流不稳定性的影响
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462824600202
A. V. Novikov, A. O. Obraz, D. A. Timokhin
{"title":"Gas Suction Effect on the Crossflow Instability in Flow Past a Swept Wing","authors":"A. V. Novikov,&nbsp;A. O. Obraz,&nbsp;D. A. Timokhin","doi":"10.1134/S0015462824600202","DOIUrl":"10.1134/S0015462824600202","url":null,"abstract":"<p>The results of the swept wing boundary layer stability investigation are presented for the case, when the wing surface has a region of gas suction through the wall normal to the surface, while the wing is in Mach number 2 flow. In the flow regime considered the predominant boundary layer instability type is the crossflow instability. The gas suction effect on the development of unstable modes in the boundary layer is investigated using the linear stability theory and direct numerical modeling. The numerical modeling of laminar (undisturbed) flow fields with regions of gas suction and disturbed flow fields is carried out by integrating Navier–Stokes equations. An analysis within the framework of the linear stability theory is performed using the <span>({{e}^{N}})</span>-method. The suction region location is varied with conservation of the integral intensity. It is shown that the mode instability growth can be considerably suppressed at the expense of an optimal disposition of the suction region.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"270 - 278"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939741","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
Determination of the Shape and Dimensions of the Polymer Molecules in Solutions Using Diffusional NMR Relaxation 利用扩散 NMR 驰豫确定溶液中聚合物分子的形状和尺寸
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S001546282360325X
V. A. Ivanova, A. V. Maksimychev, P. L. Men’shikov, A. R. Pashutin, A. M. Perepukhov, A. N. Rozhkov, M. V. Tsar’kov
{"title":"Determination of the Shape and Dimensions of the Polymer Molecules in Solutions Using Diffusional NMR Relaxation","authors":"V. A. Ivanova,&nbsp;A. V. Maksimychev,&nbsp;P. L. Men’shikov,&nbsp;A. R. Pashutin,&nbsp;A. M. Perepukhov,&nbsp;A. N. Rozhkov,&nbsp;M. V. Tsar’kov","doi":"10.1134/S001546282360325X","DOIUrl":"10.1134/S001546282360325X","url":null,"abstract":"<p>A new method of determining the dimensions and shapes of polymer molecules in solutions is proposed and verified in experiments. The method is based on the measurements of the relaxation of the transverse magnetization intensity of nuclei. It is established that the decaying signal of the spin echo from elongated molecules contains two terms exponentially decaying with time, which correspond to two diffusion coefficients differing by a factor of about two. The signal from molecules with a near-spherical shape contain only one exponent.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"300 - 303"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939848","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
Linear Waves on Shallow Water Slowing Down near the Shore over Uneven Bottom 浅水区的线性波浪在不平整的海底近岸处减速
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462823603066
I. E. Melnikov, E. N. Pelinovsky
{"title":"Linear Waves on Shallow Water Slowing Down near the Shore over Uneven Bottom","authors":"I. E. Melnikov,&nbsp;E. N. Pelinovsky","doi":"10.1134/S0015462823603066","DOIUrl":"10.1134/S0015462823603066","url":null,"abstract":"<p>The exact solutions to the system of equations of the linear theory of shallow water that represent travelling waves with some specific properties on the time propagation interval are discussed. These solutions are infinite when approaching the shore and finite when leaving for deep water. The solutions are obtained by reducing one-dimensional equations of shallow water to the Euler-Poisson-Darboux equation with negative integer coefficient ahead of the lower derivative. An analysis of the wave field dynamics is carried out. It is shown that the shape of a wave approaching the shore will be differentiated a certain number of times. This is illustrated by a number of examples. When the wave moves away from the shore, its profile is integrated. The solutions obtained within the framework of linear theory are valid only on a finite interval of variation in the depth.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"260 - 269"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940021","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 Interaction between Weak Shock Waves and Supersonic Boundary Layer on a Flat Plate with the Blunt Leading Edge 钝前缘平板上弱冲击波与超音速边界层相互作用的数值模拟
IF 1 4区 工程技术
Fluid Dynamics Pub Date : 2024-05-08 DOI: 10.1134/S0015462823603236
I. V. Egorov, N. K. Nguen, P. V. Chuvakhov
{"title":"Numerical Simulation of the Interaction between Weak Shock Waves and Supersonic Boundary Layer on a Flat Plate with the Blunt Leading Edge","authors":"I. V. Egorov,&nbsp;N. K. Nguen,&nbsp;P. V. Chuvakhov","doi":"10.1134/S0015462823603236","DOIUrl":"10.1134/S0015462823603236","url":null,"abstract":"<p>The interaction of weak shock waves in form of an <i>N</i>-wave with the supersonic laminar boundary layer on a flat plate with blunt leading edge at the free-stream Mach number M = 2.5 is numerically studied. The numerical results are compared with known experimental data. The combined influence of the <i>N</i>-wave and the leading edge bluntness on the laminar-turbulent transition process is discussed.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 2","pages":"279 - 290"},"PeriodicalIF":1.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0015462823603236.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140939742","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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