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Fast BH/Multipoles Algorithm for Solving Boundary Integral Equation in Vortex Particle Methods of Computational Hydrodynamics 计算流体力学涡旋粒子法中边界积分方程的快速BH/多极算法
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700283
E. P. Ryatina
{"title":"Fast BH/Multipoles Algorithm for Solving Boundary Integral Equation in Vortex Particle Methods of Computational Hydrodynamics","authors":"E. P. Ryatina","doi":"10.1134/S1063784226700283","DOIUrl":"10.1134/S1063784226700283","url":null,"abstract":"<p>A fast algorithm for solving a boundary integral equation arising in vortex particle methods of computational hydrodynamics is proposed. The algorithm is based on a hybrid fast method combining the Barnes–Hut method and the fast multipole method and is adapted for iterative solution of linear systems for <i>T</i>-schemes with piecewise-constant and piecewise-linear solution representations. Analytical expressions for multipole moments of rectilinear panels and for integrals of local expansion coefficients with constant and linear weight functions are derived, allowing taking into account local influence integration and the vorticity distribution over panels in both nearby and far zones. The proposed algorithm achieves quasi-linear computational complexity without significant accuracy reduction.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"294 - 301"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Feasibility of Adapting Lagrangian Vortex Particle Methods for High-Reynolds Two-Dimensional Flow Simulation 拉格朗日涡旋粒子法用于高雷诺数二维流动模拟的可行性
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700258
Yu. Izmailova
{"title":"Feasibility of Adapting Lagrangian Vortex Particle Methods for High-Reynolds Two-Dimensional Flow Simulation","authors":"Yu. Izmailova","doi":"10.1134/S1063784226700258","DOIUrl":"10.1134/S1063784226700258","url":null,"abstract":"<p>Vortex Particle Methods (VPMs) are meshless Lagrangian methods for computational fluid dynamics (CFD) that are particularly efficient for estimating hydrodynamic loads acting on streamlined airfoils (or their systems), especially for highly unsteady flows and complex fluid-structure interaction (FSI) problems. Their key advantages include low numerical diffusion due to their particle-based nature and computational efficiency. However, at moderate and high Reynolds numbers (~10<sup>3</sup> and higher), the applicability of two-dimensional VPMs becomes restricted. Reliable simulation results can be obtained only for airfoils with sharp edges. For airfoils with smooth boundaries, the simulation results diverge from experimental data because unresolved three-dimensional turbulent effects govern such flows. To demonstrate this, the flow simulation around an immovable circular cylinder from small to high Reynolds numbers was considered. The numerical results for hydrodynamic loads acting on this cylinder were compared using OpenFOAM and an in-house VPM code, VM2D, which implements the Viscous Vortex Domains (VVD) method. Analysis of the velocity field in a vortex wake behind a circular cylinder showed that the spatial and temporal spectra of turbulence kinetic energy follow a power law with an exponent (–3) instead of the classical (–5/3) predicted by Kolmogorov–Obukhov theory. This result matches theoretical expectations for purely two-dimensional flows, where three-dimensional turbulent effects are not simulated. It confirms that 2D VPMs cannot accurately capture turbulent flow behavior around smooth bodies at high Reynolds numbers. The paper also discusses possible ways to improve two-dimensional vortex methods by adding LES-type turbulence models.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"262 - 272"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Temperature State of a Plate Considering the Effect of Spatial Nonlocality 考虑空间非定域效应的平板温度状态
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700192
I. Yu. Savelyeva, V. S. Zarubin, A. M. Mishustin
{"title":"Temperature State of a Plate Considering the Effect of Spatial Nonlocality","authors":"I. Yu. Savelyeva,&nbsp;V. S. Zarubin,&nbsp;A. M. Mishustin","doi":"10.1134/S1063784226700192","DOIUrl":"10.1134/S1063784226700192","url":null,"abstract":"<p>The need to apply nonlocal heat conduction theory in the physical sciences and engineering dates to the mid-20th century and is associated with attempts to describe experimental data based on the Biot–Fourier hypothesis. In this paper, we investigate the steady-state temperature state of a homogeneous plate, considering spatial nonlocality described by a convolution-type integral term. Analytical solutions are obtained for a one-dimensional problem by considering a simple influence function. The influence of the nonlocality coefficient on the degree of deviation of the temperature distribution across the plate thickness from the classical solution is investigated. The temperature state of the plate, obtained using a macroscale approach, is compared with the results of mathematical modeling of the temperature distribution at the nanoscale using nonequilibrium molecular dynamics.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"221 - 226"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Model of a Wire Actuator Made of Shape Memory Material for Opening a Large-Scale Space Structure 大尺度空间结构开口用形状记忆材料丝致动器模型
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700027
V. N. Zimin, A. O. Shakhverdov
{"title":"Model of a Wire Actuator Made of Shape Memory Material for Opening a Large-Scale Space Structure","authors":"V. N. Zimin,&nbsp;A. O. Shakhverdov","doi":"10.1134/S1063784226700027","DOIUrl":"10.1134/S1063784226700027","url":null,"abstract":"<p>Large-scale structures should be delivered to orbit in a transport tightly packed form, allowing their transformation from a folded state to an expanded one. The very procedure of deploying the structure occurs under the influence of force actuators. In order to avoid dynamic loads affecting the elements of the transformed system, it is necessary to use actuators that operate without impact and have a relatively small mass. It is advisable to use an actuator with an active element made of titanium nickelide material with a shape memory effect. For these active elements, the control effect is the temperature field. The phase transformations of the titanium nickelide material are highly sensitive to temperature changes, which necessitate its precise control.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"211 - 214"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of Uranium Dioxide Pellet Cracking Using Smeared Crack Model 用涂抹裂纹模型模拟二氧化铀球团的开裂
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700180
P. S. Aronov, M. P. Galanin, V. V. Lukin, A. S. Rodin
{"title":"Simulation of Uranium Dioxide Pellet Cracking Using Smeared Crack Model","authors":"P. S. Aronov,&nbsp;M. P. Galanin,&nbsp;V. V. Lukin,&nbsp;A. S. Rodin","doi":"10.1134/S1063784226700180","DOIUrl":"10.1134/S1063784226700180","url":null,"abstract":"<p>During operation of the fuel element, cracking of the uranium dioxide fuel pellet is observed. This phenomenon has a significant effect on the stress-strain state of the structure. Thermomechanical loading of the fuel element area was simulated in an axisymmetric approximation, considering non-ideal thermal and mechanical contact of the pellet with the cladding. To simulate the cracking of the pellet material, a smeared crack model is used, which uses effective Young’s moduli calculated from the fracture curve of the material. A series of calculations was carried out simulating the output of the fuel element section to the mode with the nominal heat generation power. The results showed that large areas corresponding to the cracked material were formed in the pellet during calculations. Due to the selected model of smeared cracks, the maximum values of radial, axial and circumferential tensile stresses in the pellet do not exceed the selected ultimate strength of the material.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"203 - 210"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mathematical Model of Plasticity for Isotropic Materials under Non-Isothermal Loading 非等温载荷下各向同性材料塑性的数学模型
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700301
S. A. Lopatin, D. R. Rakhimov
{"title":"Mathematical Model of Plasticity for Isotropic Materials under Non-Isothermal Loading","authors":"S. A. Lopatin,&nbsp;D. R. Rakhimov","doi":"10.1134/S1063784226700301","DOIUrl":"10.1134/S1063784226700301","url":null,"abstract":"<p>This work proposes a mathematical model for describing the nonlinear deformation of isotropic materials under non-isothermal loading. The model is formulated within a thermodynamic framework employing internal state variables, whose number, physical nature, and kinetic equations are explicitly defined. The proposed formulation yields a constitutive relation and the heat conduction equation, which together form the system of governing equations for the coupled thermoplastic boundary-value problem. As a special case, the model reduces to the constitutive framework of endochronic thermoplasticity. Analysis of the constitutive relations yields functional dependencies for the model’s material parameters. The model’s practical applicability is validated by comparing its numerical predictions with experimental data for aluminum alloy 7075-T6. The favorable agreement confirms the model’s effectiveness and its utility for analyzing the thermomechanical behavior of isotropic materials.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"327 - 334"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Modeling of the Thermal Regime of a Metal-Composite Cylindrical Cylinder during Filling with Hydrogen 金属-复合材料圆柱体充氢过程热态的数值模拟
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700325
M. K. Demchenko, E. A. Maksimova
{"title":"Numerical Modeling of the Thermal Regime of a Metal-Composite Cylindrical Cylinder during Filling with Hydrogen","authors":"M. K. Demchenko,&nbsp;E. A. Maksimova","doi":"10.1134/S1063784226700325","DOIUrl":"10.1134/S1063784226700325","url":null,"abstract":"<p>The paper presents a mathematical model and the results of numerical simulation of the high-pressure fast-filling process of type 3 composite pressure vessels with hydrogen. The model is based on a system of ordinary differential equations describing mass and energy balances, accounting for the real gas properties (compressibility factor), as well as the non-steady-state heat conduction equation for the multilayer vessel shell. The influence of various gas supply modes—with constant and decreasing mass flow rates – on the dynamics of pressure and temperature changes inside the vessel is investigated. A quantitative analysis was conducted for type 3 cylinders with various material combinations: a standard aluminum liner (AMg6) with reinforcing microplastic and an alternative version made of corrosion-resistant steel (12Kh18N10T) in combination with high-strength carbon fiber reinforced plastic (CFRP). It was established that the cylindrical geometry and thermophysical properties of the selected materials significantly affect the heat transfer intensity and the final thermal state of the shell. The results obtained allow for the optimization of fueling parameters to prevent hydrogen overheating above the permissible safety limit (358 K) and to reduce the filling time of cylinders under the conditions of modern hydrogen refueling stations.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"335 - 341"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Solution of the Problem of Force Loading of the Cylindrical Part of a Metal-Composite High-Pressure Vessel Beyond the Elastic Limit 金属复合材料高压容器圆柱形部件超出弹性极限受力问题的求解
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700337
I. T. Zakieva, G. V. Grishyna
{"title":"Solution of the Problem of Force Loading of the Cylindrical Part of a Metal-Composite High-Pressure Vessel Beyond the Elastic Limit","authors":"I. T. Zakieva,&nbsp;G. V. Grishyna","doi":"10.1134/S1063784226700337","DOIUrl":"10.1134/S1063784226700337","url":null,"abstract":"<p>This article considers the calculation of the stress-strain state of the cylindrical part of a metal-composite pressure vessel using the deformation theory of plasticity for isotropic materials. Since the stress state of the metal liner is not plane, the calculation was performed using the method of variable elastic parameters, accounting for radial stress. The algorithm was implemented in the Wolfram Mathematica computer algebra system for two liner materials. The obtained results demonstrate the influence of the radial component on the stress-strain state, which can be significant for materials with low yield and tensile strengths.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"342 - 347"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient MoM Modeling of Microwave Devices with Inhomogeneous Waveports 非均匀波口微波器件的高效MoM建模
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700246
V. Aushev
{"title":"Efficient MoM Modeling of Microwave Devices with Inhomogeneous Waveports","authors":"V. Aushev","doi":"10.1134/S1063784226700246","DOIUrl":"10.1134/S1063784226700246","url":null,"abstract":"<p>A mathematical model and a numerical method are proposed for solving Maxwell’s equations in structures with inhomogeneous waveguide ports based on a system of combined field integral equations. The model supports both perfect electric conductors and dielectric regions of arbitrary shape. In contrast to approaches requiring a special basis of the port’s eigenmodes, the proposed method allows the use of standard basis functions for currents (RWG and higher-order functions). This enables correct accounting of complex port cross-sections with various dielectrics and allows for seamless integration of such ports calculation into existing software packages for solving diffraction problems without modifying their core (including fast algorithms, e.g., MLFMM). The possibility of using second-order basis functions to achieve higher accuracy in S-parameter calculation is illustrated on model problems. Verification of the method was performed using examples of a waveguide with inhomogeneous dielectric filling and a horn antenna, showing good agreement with calculations in commercial software packages (HFSS, CST, FEKO) and with experimental data.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"254 - 261"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Semi-Transparent Thermal Protection Layers on the Temperature Distribution in the Forward Heatshield of a Descending Probe 半透明隔热层对下降探头前防热罩温度分布的影响
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700222
V. V. Leonov, V. S. Zarubin
{"title":"Effect of Semi-Transparent Thermal Protection Layers on the Temperature Distribution in the Forward Heatshield of a Descending Probe","authors":"V. V. Leonov,&nbsp;V. S. Zarubin","doi":"10.1134/S1063784226700222","DOIUrl":"10.1134/S1063784226700222","url":null,"abstract":"<p>The use of structurally sensitive thermal protection materials with a high degree of thermal conductivity anisotropy allows for the redistribution of heat fluxes across the entire surface of the thermal protection coating. As a result, the thermal protection layers heat up significantly during descent. Often, due to mass minimization and consequently, the reduction of thermal protection thickness these layers operate at the limit of their materials' operational capabilities, both in terms of reached temperatures and the induced thermal stresses. At such temperature levels at the internal layer interfaces, besides conduction, radiative heat transfer begins to play a substantial role if any of the layers are semi-transparent. Neglecting the radiative heat flux can lead to significant inaccuracies and erroneous conclusions regarding the suitability of the thermal protection shield.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"237 - 245"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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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