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JOULE HEATING OF A SHAPED-CHARGE JET FORMED BY THE COLLAPSE OF A CONICAL METAL LINER IN A MAGNETIC FIELD 锥形金属衬里在磁场中坍缩形成的聚能射流的焦耳加热
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-18 DOI: 10.1134/S0021894424060014
S.V. Stankevich, G.A. Shvetsov
{"title":"JOULE HEATING OF A SHAPED-CHARGE JET FORMED BY THE COLLAPSE OF A CONICAL METAL LINER IN A MAGNETIC FIELD","authors":"S.V. Stankevich,&nbsp;G.A. Shvetsov","doi":"10.1134/S0021894424060014","DOIUrl":"10.1134/S0021894424060014","url":null,"abstract":"<p>This paper presents the results of numerical simulation of magnetic field cumulation and the Joule heating of shaped-charge jets produced by explosive compression of a metal cone in which a magnetic field was pre-generated. The problem is considered in a two-dimensional axisymmetric non-stationary formulation. The finite electrical conductivity of the cone material is taken into account, and various methods of generating the initial magnetic field (using one or two solenoids) are considered. It is found that that during cone compression, the magnetic field induction can increase several hundred-fold. For a relatively low initial magnetic field induction on the cone axis (<span>(0.09{-}0.17)</span> T), the temperature increase near the axis of the shaped-charge jet due to heating by eddy currents is <span>(200{-}300)</span>°C. This heating can be accompanied by thermal softening of the shaped-charge jet material and an increase in its ultimate elongation and hence penetration capability.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 6","pages":"1011 - 1020"},"PeriodicalIF":0.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849030","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
MATHEMATICAL MODELING OF TEMPERATURE EFFECT ON PLASMA TRANSPORT IN A HELICAL MAGNETIC FIELD 螺旋磁场中温度对等离子体输运影响的数学模型
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-18 DOI: 10.1134/S0021894424060026
G.G. Lazareva, I.P. Oksogoeva, A.V. Sudnikov
{"title":"MATHEMATICAL MODELING OF TEMPERATURE EFFECT ON PLASMA TRANSPORT IN A HELICAL MAGNETIC FIELD","authors":"G.G. Lazareva,&nbsp;I.P. Oksogoeva,&nbsp;A.V. Sudnikov","doi":"10.1134/S0021894424060026","DOIUrl":"10.1134/S0021894424060026","url":null,"abstract":"<p>This paper presents preliminary results of refinement of the mathematical model of plasma transport in a helical open magnetic trap (SMOLA). Plasma is contained in the device by transferring a magnetic field pulse with helical symmetry to the rotating plasma. The mathematical model is based on the stationary equation of plasma transport. The paper presents a method for taking into account the effect of the model coefficients using additional information. The calculated dependence of temperature on coordinates is obtained, which qualitatively agrees with the experimental data. Ordinary differential equations are obtained, which follow from the original model and can be used to refine the coefficients. The mathematical model is developed to predict the plasma confinement parameters in devices with a spiral magnetic field.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 6","pages":"1021 - 1029"},"PeriodicalIF":0.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849031","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
MODELING OF BOTTOM-HOLE PRESSURE DYNAMICS IN A SLANTED WELL 斜井井底压力动态模型
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-18 DOI: 10.1134/S0021894424060087
R.R. Urazov, O.V. Akhmetova, I.I. Gallyamitdinov, A.Ya Davletbaev, V.V. Sarapulova, A.V. Pestrikov
{"title":"MODELING OF BOTTOM-HOLE PRESSURE DYNAMICS IN A SLANTED WELL","authors":"R.R. Urazov,&nbsp;O.V. Akhmetova,&nbsp;I.I. Gallyamitdinov,&nbsp;A.Ya Davletbaev,&nbsp;V.V. Sarapulova,&nbsp;A.V. Pestrikov","doi":"10.1134/S0021894424060087","DOIUrl":"10.1134/S0021894424060087","url":null,"abstract":"<p>The paper presents solutions to problems of nonstationary filtration to an imperfect well with an arbitrary angle of inclination from the vertical, allowing for the interpretation of data based on pressure transient test and production forecasting. Solutions are obtained for various conditions on the top and bottom of the reservoir, while two algorithms are implemented to describe the bottom-hole pressure: a multi-segment and a single-segment algorithm with the determination of an equal pressure point. A computational experiment shows that the calculation results obtained using single- and multi-segment algorithms are in good agreement.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 6","pages":"1096 - 1108"},"PeriodicalIF":0.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849035","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
MULTI-BRANCH HYSTERESIS OF STATES OF A SESSILE DROPLET ON A CYCLICALLY STRETCHED ELASTIC SUBSTRATE 在循环拉伸弹性基底上的液滴状态的多分支迟滞
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-18 DOI: 10.1134/S0021894424060051
V.A. Dekhtyar, A.E. Dubinov
{"title":"MULTI-BRANCH HYSTERESIS OF STATES OF A SESSILE DROPLET ON A CYCLICALLY STRETCHED ELASTIC SUBSTRATE","authors":"V.A. Dekhtyar,&nbsp;A.E. Dubinov","doi":"10.1134/S0021894424060051","DOIUrl":"10.1134/S0021894424060051","url":null,"abstract":"<p>The states of liquid albumin droplets sitting on a non-wetting horizontal elastic substrate which was first cyclically stretched and then relaxed have been studied experimentally. Multi-branch hysteresis of droplet states has been found. The number of hysteresis branches can be varied by changing the law of motion of the substrate.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 6","pages":"1066 - 1070"},"PeriodicalIF":0.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849032","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
SURFACE ACOUSTIC WAVES AT A BOUNDARY OF TWO POROUS MEDIA SATURATED WITH METHANE HYDRATE AND WATER (ICE) 两种含甲烷水合物和水（冰）饱和多孔介质边界处的表面声波
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-18 DOI: 10.1134/S0021894424060063
E.V. Galiakbarova, G.R. Karimova
{"title":"SURFACE ACOUSTIC WAVES AT A BOUNDARY OF TWO POROUS MEDIA SATURATED WITH METHANE HYDRATE AND WATER (ICE)","authors":"E.V. Galiakbarova,&nbsp;G.R. Karimova","doi":"10.1134/S0021894424060063","DOIUrl":"10.1134/S0021894424060063","url":null,"abstract":"<p>This paper describes the propagation of vertically polarized surface acoustic waves at a boundary between porous media saturated with methane hydrate and ice (water), as well as horizontally polarized waves at an interface between a hydrate-saturated porous medium and a water-saturated porous medium. A mathematical model is developed for flat harmonic waves. The porous medium saturated with gas hydrate or ice (water) is assumed to be an elastic isotropic body. The mathematical model includes wave equations for scalar and vector potentials of wave velocities with account for displacement and stress vector components of the medium particles. Conditions for the continuity of displacements and stresses in porous media at the interface are given. The obtained dispersion equations are analyzed, and the results are compared with experimental data. It is revealed that the penetration depth of a transverse wave into hydrate-saturated sand is greater than the penetration depth of a longitudinal wave. It is proposed to determine the presence of hydrate-saturated sand at positive temperatures of bottom sediments by the penetration depth and the variation of the zero mode velocity of the horizontally polarized wave.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 6","pages":"1071 - 1081"},"PeriodicalIF":0.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849033","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
STABILITY OF A FLUID FLOW IN A FLAT CHANNEL WITH WAVY WALLS 带波浪壁的扁平通道中流体流动的稳定性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-08 DOI: 10.1134/S0021894424050171
Yu.Ya. Trifonov
{"title":"STABILITY OF A FLUID FLOW IN A FLAT CHANNEL WITH WAVY WALLS","authors":"Yu.Ya. Trifonov","doi":"10.1134/S0021894424050171","DOIUrl":"10.1134/S0021894424050171","url":null,"abstract":"<p>This paper presents the study of a viscous fluid flow between two wavy horizontal surfaces unbounded longitudinally and transversely. Full Navier–Stokes equations are applied to describe the linear stability of such a flow with respect to various three-dimensional perturbations. Two types of wall waviness are studied: longitudinal and transverse periodic corrugation. The first stage is comprised of obtaining the main solution and linearizing initial equations in the vicinity of this solution. The second stage is comprised of solving the generalized problem of determining eigenvalues and analysing the entire possible spectrum of perturbations. The varied parameters are the Reynolds number, as well as corrugation amplitude, period, and shape. Velocity and pressure field perturbations are generally characterized by two wave numbers, which are additional parameters. The influence of the parameters and shape of the wall waviness on the region where the laminar-turbulent transition begins is investigated.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 5","pages":"965 - 979"},"PeriodicalIF":0.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793084","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
INSTABILITY AND SHORT WAVES IN A HYPERBOLIC PREDATOR–PREY SYSTEM 双曲型捕食-食饵系统的不稳定性和短波
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-08 DOI: 10.1134/S0021894424050122
A.B. Morgulis
{"title":"INSTABILITY AND SHORT WAVES IN A HYPERBOLIC PREDATOR–PREY SYSTEM","authors":"A.B. Morgulis","doi":"10.1134/S0021894424050122","DOIUrl":"10.1134/S0021894424050122","url":null,"abstract":"<p>This paper presents a mathematical model of a medium consisting of active particles capable of adjusting their movement depending on so-called signals or stimuli. Such models are used, e.g., to study the growth of living tissues, colonies of microorganisms and more highly organized populations. The interaction between particles of two species, one of which (predator) pursues the other (prey) is investigated. Predator movement is described by the Cattaneo heat equation, and the prey is only capable of diffusing. Due to the hyperbolicity of the Cattaneo model, the presence of long-lived short-wave patterns can be expected in the case of sufficiently low diffusion of preys. However, the mechanism of instability and failure of such patterns is found. Explicit relations for the predator transport coefficients are derived that block this mechanism.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 5","pages":"907 - 916"},"PeriodicalIF":0.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793079","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
ON THE UNIQUENESS OF THE CLASSICAL SOLUTION OF THE FINGERING PROBLEM IN A HELE-SHAW CELL WITH SURFACE TENSION 关于具有表面张力的黑尔-肖细胞中指法问题经典解的唯一性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-08 DOI: 10.1134/S002189442405016X
A. Tani, H. Tani
{"title":"ON THE UNIQUENESS OF THE CLASSICAL SOLUTION OF THE FINGERING PROBLEM IN A HELE-SHAW CELL WITH SURFACE TENSION","authors":"A. Tani,&nbsp;H. Tani","doi":"10.1134/S002189442405016X","DOIUrl":"10.1134/S002189442405016X","url":null,"abstract":"<p>The existence of a classical solution was established for a one-phase radial viscous fingering problem in a Hele-Shaw cell under surface tension (original problem) by means of parabolic regularization for a certain subsequence <span>({varepsilon_n}_{n in mathbb{N}})</span>, <span>(varepsilon_n&gt;0)</span>. In this paper, we prove the uniqueness of the classical solution to the original problem with the use of parabolic regularization for the full sequence of the parameter <span>({varepsilon})</span>, <span>(varepsilon&gt;0)</span>.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 5","pages":"952 - 964"},"PeriodicalIF":0.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793083","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
ON THE ROLE OF THE HIDDEN INTEGRAL OF MOTION IN THE THEORY OF NON-SELF-SIMILAR SUBMERGED JETS OF A VISCOUS INCOMPRESSIBLE FLUID 运动隐积分在粘性不可压缩流体非自相似浸没射流理论中的作用
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-08 DOI: 10.1134/S0021894424050201
N.I. Yavorsky
{"title":"ON THE ROLE OF THE HIDDEN INTEGRAL OF MOTION IN THE THEORY OF NON-SELF-SIMILAR SUBMERGED JETS OF A VISCOUS INCOMPRESSIBLE FLUID","authors":"N.I. Yavorsky","doi":"10.1134/S0021894424050201","DOIUrl":"10.1134/S0021894424050201","url":null,"abstract":"<p>The role of the hidden integral of motion in the correct description of the far field of velocities and pressures for non-self-similar submerged jets of an incompressible viscous fluid with a source of motion of non-zero characteristic size is discussed based on the full Navier–Stokes equations. It is shown that the emergence of the hidden conservation integral is due to the fact that for real spatially extended sources of jet flow, the coordinates of the effective point source of momentum may not coincide with the coordinates of the effective point source of mass. Using special functions, an exact analytical solution is obtained for all terms of the asymptotic expansion of the far field of a non-self-similar submerged jet which is described by all integrals of motion: conservation of total momentum flux, conservation of total angular momentum flux, conservation of total mass flux, and the additional hidden conservation integral associated with the conservation of total angular momentum flux. It is shown that the hidden integral was actually first obtained by Loitsyanskii in studying a non-self-similar solution for a submerged jets using the boundary layer approximation, but it was mistakenly interpreted as the integral of conservation of mass flux from the jet source. Based on the obtained exact solution, the velocity and pressure fields at different Reynolds numbers and different values of the hidden integral are calculated for a model of jet flow issuing from a circular tube of finite size. The influence of the hidden integral of motion on the flow pattern is analyzed.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 5","pages":"994 - 1010"},"PeriodicalIF":0.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793078","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
SOLUTIONS OF LINEAR MODEL HYDRODYNAMIC EQUATIONS WITH VARIABLE COEFFICIENTS 变系数线性模型水动力方程的解
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2025-04-08 DOI: 10.1134/S0021894424050080
O.V. Kaptsov
{"title":"SOLUTIONS OF LINEAR MODEL HYDRODYNAMIC EQUATIONS WITH VARIABLE COEFFICIENTS","authors":"O.V. Kaptsov","doi":"10.1134/S0021894424050080","DOIUrl":"10.1134/S0021894424050080","url":null,"abstract":"<p>Linear model equations in partial derivatives with two independent variables are considered. The highest operator symmetries and general solutions for a series of hyperbolic equations are found. Equivalence transformations are constructed for some equations.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 5","pages":"875 - 881"},"PeriodicalIF":0.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793241","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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