Technical Physics最新文献_第6页

Numerical Simulation of Mass Heat Transfer in the Air Gap between Plates by ICFD Method 板间气隙传质传热的ICFD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/S1063784226700179

A. A. Kotov, A. V. Cherednichenko

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On the Issue of Studying the Stability of the Resting State under Small Oscillations of an Aerodynamic Pendulum in a Quasi-Static Medium Flow 准静态介质流中气动摆摆小振荡静息态稳定性研究

IF 0.7 4区物理与天体物理

Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700349

D. Belyakov

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Erratum to: Compact (Small-Sized) Neutron Sources: A Review 对致密（小型）中子源的勘误：综述

IF 0.7 4区物理与天体物理

Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226050014

V. V. Kuzenov, S. V. Ryzhkov

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Mathematical Modeling of the Temperature Field of a Shock-Compressed Incompressible Fluid Containing Glass Microspheres 含玻璃微球的冲击压缩不可压缩流体温度场的数学建模

IF 0.7 4区物理与天体物理

Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700209

A. Attetkov, A. Kotovich, E. Pilyavskaya

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Internal Free Boundary Problem for Cold Plasma Equations 冷等离子体方程的内自由边界问题

IF 0.7 4区物理与天体物理

Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700167

L. V. Gargyants, A. V. Konovalova, O. S. Rozanova

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Special Issue of Mathematical Modeling of Physical Processes Dedicated to the 80th Anniversary of Georgy Nikolaevich Kuvyrkin 《物理过程的数学建模》特刊，纪念乔治·尼古拉耶维奇·库维尔金诞辰80周年

IF 0.7 4区物理与天体物理

Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700350

I. Yu. Savelyeva, S. V. Ryzhkov

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Analysis of a Two-Parameter Nonlocal Heat Conduction Model with Pulsed Heating 脉冲加热下的两参数非局部热传导模型分析

IF 0.7 4区物理与天体物理

Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700210

I. V. Kutuzov

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Viscous Vortex Domains Method Implementation with Neural Network Approach for Performance and Accuracy Improvement 粘性涡域方法的神经网络实现，以提高性能和精度

IF 0.7 4区物理与天体物理

Technical Physics Pub Date : 2026-05-23 DOI: 10.1134/S1063784226700295

E. Sukhova, I. Marchevsky, I. Kazey

{"title":"Viscous Vortex Domains Method Implementation with Neural Network Approach for Performance and Accuracy Improvement","authors":"E. Sukhova, I. Marchevsky, I. Kazey","doi":"10.1134/S1063784226700295","DOIUrl":"10.1134/S1063784226700295","url":null,"abstract":"The Viscous Vortex Domains (VVD) method is a powerful fully Lagrangian approach for simulating two-dimensional viscous incompressible flows. However, its computational efficiency is severely hampered by the high cost of calculating the diffusive velocity field, which is crucial for modeling viscous effects. Specifically, the evaluation of contour integrals for terms accounting for the influence of solid boundaries becomes the most time-consuming part of the algorithm, consuming up to 70% of the total simulation time, since (N)-body-type fast methods that allow for a “dramatic” speedup of the rest of the algorithm turn out to be inefficient for this operation. This paper presents a novel approach to accelerate this calculation by replacing the direct numerical integration with a fast approximation using a pre-trained multilayer perceptron (MLP). The neural network approximates two dimensionless functions, which are universal for all panels, based on three normalized geometric parameters. The model was trained on a high-accuracy dataset generated in Wolfram Mathematica. Implemented within the VM2D code using NVIDIA’s cuDNN library for GPU acceleration, this approach demonstrates a significant performance improvement. The computation time for the diffusive velocity terms was reduced by approximately 85%, leading to a 1.75x overall speedup of the simulation time step. Furthermore, the new method provides higher accuracy, resulting in a cleaner, more periodic force signal and improved simulation quality, as demonstrated for flow around an impulsively started cylinder at ({text{Re}} = 1000).","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 of","pages":"302 - 312"},"PeriodicalIF":0.7,"publicationDate":"2026-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009641","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

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

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":"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 (~103 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.","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