Computational Continuum Mechanics最新文献_第9页

Turbulent flow simulation based on the IDDES approach using the code zFlare 紊流模拟基于IDDES方法使用的代码zFlare

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2023.16.2.18

A. Troshin, S. S. Molev, V. Vlasenko, S. Mikhaylov, S. Bakhne, S. Matyash

引用次数: 0

Removal of pollution accumulated in the process of wastewater discharge from the bottom layer of river systems 去除河流水系底层污水排放过程中积累的污染

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2022.15.2.16

B. Maryshev, Y. Parshakova, Andrey Ivantsov, N. Zubova

引用次数: 2

On one version of the Godunov method for calculating elastoplastic deformations of a medium 计算介质弹塑性变形的Godunov方法的一个版本

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2021.14.1.3

V. Surov

{"title":"On one version of the Godunov method for calculating elastoplastic deformations of a medium","authors":"V. Surov","doi":"10.7242/1999-6691/2021.14.1.3","DOIUrl":"https://doi.org/10.7242/1999-6691/2021.14.1.3","url":null,"abstract":"Godunov's hybrid method suitable for numerical calculation of elastoplastic deformation of a solid body within the framework of the classical Prandtl–Reis model with the non-barotropic state equation is described. Mises’ fluidity condition is used as a criterion for the transition from elastic to plastic state. A characteristic analysis of the model equations was carried out and their hyperbolicity was shown. It is noted that, if one takes the Maxwell–Cattaneo law instead of the Fourier law, then the Godunov hybrid method can be applied to calculate the deformation of a thermally conductive elastoplastic medium, since in this case the medium model is of a hyperbolic type. The algorithm for solving the systems in which there are equations that do not lead to divergence form is described in detail; Godunov's original method serves to integrate systems of equations represented in divergence form. When calculating stream variables on the faces of adjacent cells, a linearized Riemannian solver is used, the algorithm of which includes the right eigenvectors of the model equations. In the proposed approach, the equations written in divergence form look like finite-volume formulas, and others that do not lead to divergence form look like finite-difference relations. To illustrate the capabilities of the Godunov hybrid method, several one- and two-dimensional problems were solved, in particular, the problem of hitting an aluminum sample against a rigid barrier. It is shown that, depending on the rate of interaction, either single-wave or two-wave reflections described in the literature can be implemented with an elastic precursor.","PeriodicalId":273064,"journal":{"name":"Computational Continuum Mechanics","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115290762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of ambient air viscosity on the accuracy of measurements of liquid properties in a levitating drop 环境空气粘度对悬浮液滴中液体性质测量精度的影响

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2022.15.3.26

V. Konovalov

引用次数: 0

Numerical investigation of thermo-mechanical behaviour and microstructure evolution of a nickel alloy workpiece during its upsetting 镍合金工件镦粗过程中热力学行为及显微组织演变的数值研究

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2021.14.2.15

A. A. Rogovoy, N. Salikhova

引用次数: 1

Size evolution of a soluble aerosol particle in air 空气中可溶气溶胶颗粒的大小演变

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2022.15.1.3

Удк, Эволюция Размера Растворимой, Аэрозольной Частицы, ВО Влажном Воздухе, Ю.Л. Кузнецова, Y. L. Kuznetsovа

{"title":"Size evolution of a soluble aerosol particle in air","authors":"Удк, Эволюция Размера Растворимой, Аэрозольной Частицы, ВО Влажном Воздухе, Ю.Л. Кузнецова, Y. L. Kuznetsovа","doi":"10.7242/1999-6691/2022.15.1.3","DOIUrl":"https://doi.org/10.7242/1999-6691/2022.15.1.3","url":null,"abstract":"The mechanisms responsible for hygroscopic growth/reduction in the size of water-soluble aerosol particles have a significant effect on the dynamics of coagulation and sedimentation processes in aerosol systems. By now, there is a large amount of experimental and theoretical works devoted to the study of hygroscopic growth and decrease in the size of particles of various chemical nature. Along with complex multilayer models of aerosol particle growth, the models based on a modification of the Maxwell equation for condensation and evaporation of droplets are commonly used. They allow taking into account temperature effects, the influence of the surface curvature of the particle and the presence of soluble substances in it. This paper proposes a mathematical model of the size evolution of water-soluble aerosol particles that, together with the listed effects, takes into account the change in the size of the undissolved particle core. This makes it possible to simulate all the stages of hygroscopic change in particle size, starting from the transformation of a crystal core into a drop to its subsequent growth, and also back, from the evaporation of a drop to the formation of a crystal. Using the proposed model, various scenarios of changing the state of the particle are modeled for different combinations of the initial states of the particle and the relative humidity of the air. It is shown that the predictions from the model are qualitatively and quantitatively consistent with the experimental data on the size evolution of sodium chloride particles in humidification and drying processes, as well as with the results of measurements of particle sizes in equilibrium states with increasing and decreasing relative humidity. The developed model can be used to solve different fundamental and applied problems of the dynamics of water-soluble aerosol systems.","PeriodicalId":273064,"journal":{"name":"Computational Continuum Mechanics","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121625672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two dimensional bisection algorithm and shooting method for linear analysis of equilibrium stability in convection processes 对流过程平衡稳定性线性分析的二维平分算法和射击法

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2023.16.3.23

S. Prokopev, T. Lyubimova

引用次数: 0

Fluid transport in Forchheimer porous medium with spatially varying porosity and permeability 孔隙度和渗透率空间变化的Forchheimer多孔介质中的流体输运

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2019.12.3.24

Удк, Фильтрация Жидкости, В Пористой, Среде Форцгеймера, С Пространственно, Неоднородными Пористостью, И Проницаемостью, Р.Р. Сираев, R. Siraev

{"title":"Fluid transport in Forchheimer porous medium with spatially varying porosity and permeability","authors":"Удк, Фильтрация Жидкости, В Пористой, Среде Форцгеймера, С Пространственно, Неоднородными Пористостью, И Проницаемостью, Р.Р. Сираев, R. Siraev","doi":"10.7242/1999-6691/2019.12.3.24","DOIUrl":"https://doi.org/10.7242/1999-6691/2019.12.3.24","url":null,"abstract":"Теоретически исследовалась фильтрация несжимаемой жидкости в неоднородной пористой среде, основные характеристики которой – пористость и проницаемость – являются непрерывными функциями координат. Математическая модель базировалась на уравнении Форцгеймера с дополнительным слагаемым, учитывающим неоднородность среды. Численно изучалось влияние неоднородностей параметров пористой среды на фильтрацию в плоском канале. Для упрощения делалось предположение об отсутствии корреляции между пористостью и проницаемостью, которые затем считались независимыми параметрами среды. Полученные результаты свидетельствуют, что в неоднородных пористых средах изменения проницаемости и пористости по-разному влияют на фильтрацию несжимаемой жидкости. В первом случае жидкость, обтекая участки с малой проницаемостью, подчиняется закону Форцгеймера. При смене направления течения на противоположное структура гидродинамических полей (исключение составляет поле скорости) и расход жидкости остаются прежними. В средах с пористостью, зависящей от координат, существует асимметрия течения: скорость фильтрации в направлении возрастания пористости больше, чем в обратном направлении. При наличии внешнего периодического воздействия такая несимметричность может вызвать вторичное осредненное течение. Это проиллюстрировано на задаче фильтрации в канале, заполненном насыщенной пористой средой, при наличии периодического расхода жидкости. Рассмотрен случай, когда внешнее периодическое воздействие имеет высокую по сравнению с гидродинамическими временами частоту, что позволяет применить к системе процедуру осреднения. Получены уравнения, описывающие осредненное течение, существующее на фоне осциллирующего движения. Вторичное движение возникает под действием вибрационной силы, представляемой в уравнениях слагаемым с градиентом пористости, и может зародиться даже при отсутствии постоянного перепада давления. Для одномерного течения получено аналитическое решение. Интенсивность осредненного течения определяется проницаемостью и градиентом пористости среды, амплитудой и частотой периодического воздействия.","PeriodicalId":273064,"journal":{"name":"Computational Continuum Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129123892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Scattering of small-amplitude phonons on discrete breathers in Fermi-Pasta-Ulam-Tsingou chain Fermi-Pasta-Ulam-Tsingou链中离散呼吸体上小振幅声子的散射

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2021.14.4.37

S. Dmitriev, A. Y. Morkina, E. Korznikova, O. Naimark, A. Nikitiuk, M. Baggioli

引用次数: 0

Numerical coupled model of creeping flow of multi-phase fluid 多相流体蠕变流动数值耦合模型

Computational Continuum Mechanics Pub Date : 1900-01-01 DOI: 10.7242/1999-6691/2020.13.2.12

V. V. Pak

{"title":"Numerical coupled model of creeping flow of multi-phase fluid","authors":"V. V. Pak","doi":"10.7242/1999-6691/2020.13.2.12","DOIUrl":"https://doi.org/10.7242/1999-6691/2020.13.2.12","url":null,"abstract":"Two-dimensional c ouple numerical model of creeping flow of multi-phase fluid has been developed. The computational domain consists of relatively thick layer of two-phase medium overlaid by a thin multi-layered viscous sheet. There is mass transition at the conjunction boundary between light component of two-phase layer and the bottom layer of viscous sheet. The general system of governing equations consists of the equations of compaction describing the flow in the two-phase layer and the Reynolds equations describing the flow in the sheet. We take into account the layer structure of the sheet and surface processes of erosion and sedimentation as well. We use the additional asymptotic boundary condition to couple different-type hydrodynamic equations without any iterative improvements. That condition reduces significantly computational costs in comparison with the available coupled models. We fulfill numerical modeling of the evolution of the velocity field and layer boundaries. Numerical results reveal different regimes of evolution of velocity field and layer boundaries at short and long times. At least it consists of two stages with typical time scales, namely, a fast evolution at short times changed by slowly (quasistationary) stage at long times. That kind of evolution depends on geometrical and physical parameters of media rather than external causes. Some possible applications in tectonics and geophysics of these model results are outlined. They can be applied to investigate lithosphere thinning beneath large-scale tectonic depressions. Numerical calculations can be applied in geophysics to study the process of accumulation lightened mantle beneath the Earth crust of active transient zone of ocean–continent.","PeriodicalId":273064,"journal":{"name":"Computational Continuum Mechanics","volume":"296 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128636738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0