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Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy最新文献

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Dépendance du coefficient homogénéisé par rapport à la forme des inclusions dans un matériau composite 均质系数与复合材料中夹杂物形状的关系
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00120-4
Alain Bourgeat, Olivier Gipouloux
{"title":"Dépendance du coefficient homogénéisé par rapport à la forme des inclusions dans un matériau composite","authors":"Alain Bourgeat,&nbsp;Olivier Gipouloux","doi":"10.1016/S1287-4620(00)00120-4","DOIUrl":"10.1016/S1287-4620(00)00120-4","url":null,"abstract":"<div><p>In case of a two components material with a matrix reinforced by a large number of inclusions, we describe explicitely the dependence of the homogenized coefficients in function of the inclusions shape.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 199-202"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00120-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"94530870","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
Perte de pression et vitesse minimum de fluidisation dans un lit de particules 2D 二维颗粒床中的压力损失和最小流化速度
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00125-3
Blanche Dalloz-Dubrujeaud, Roland Faure, Lounès Tadrist, Guy Giraud
{"title":"Perte de pression et vitesse minimum de fluidisation dans un lit de particules 2D","authors":"Blanche Dalloz-Dubrujeaud,&nbsp;Roland Faure,&nbsp;Lounès Tadrist,&nbsp;Guy Giraud","doi":"10.1016/S1287-4620(00)00125-3","DOIUrl":"10.1016/S1287-4620(00)00125-3","url":null,"abstract":"<div><p>In order to determine the pressure drop equation and the minimum fluidization velocity of a 2D bed of monodispersed particles, an experimental setup has been devoloped. The first results show clearly that the well-known equations for 3D bed are not reliable for this configuration. In particular, the minimum fluidization velocity is underestimated. A new pressure drop law is proposed which allows the determination of the minimum fluidization velocity, and is in good agreement with the experimental measurements.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 231-236"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00125-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74733554","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: 3
Étude numérique des structures spirales tridimensionnelles à la périphérie d'une cavité interdisque 盘间腔外围三维螺旋结构的数值研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00114-9
Daniel Buisine , Frédéric Oble, Herinirina Andrianarahinjaka
{"title":"Étude numérique des structures spirales tridimensionnelles à la périphérie d'une cavité interdisque","authors":"Daniel Buisine ,&nbsp;Frédéric Oble,&nbsp;Herinirina Andrianarahinjaka","doi":"10.1016/S1287-4620(00)00114-9","DOIUrl":"10.1016/S1287-4620(00)00114-9","url":null,"abstract":"<div><p>Recent visualisations have shown the instabilities that develop at low Reynolds numbers in a closed cavity formed by a rotating disc, a fixed disc and a fixed outer cylinder. The origin of the spiral structures located near the fixed corner of the cavity is still not well understood. A numerical scheme associating a finite volume method and a pseudo-spectral method is used. The velocity and pressure fields are analysed. A description of this complex structure is proposed.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 237-246"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00114-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83336414","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: 10
Effets thermiques dus à l'anisotropie optique dans un cristal uniaxe 单轴晶体中光学各向异性引起的热效应
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00123-X
Philippe Ben-Abdallah, Vital Le Dez
{"title":"Effets thermiques dus à l'anisotropie optique dans un cristal uniaxe","authors":"Philippe Ben-Abdallah,&nbsp;Vital Le Dez","doi":"10.1016/S1287-4620(00)00123-X","DOIUrl":"10.1016/S1287-4620(00)00123-X","url":null,"abstract":"<div><p>A theoretical study of the radiative heat transfer inside an uniaxial dichroic non optically active crystal is presented. The general equations which govern the thermal problem are established for absorbing moderately crystals. The temperature and radiative flux fields at radiative equilibrium show the thermal effects due to the anisotropy inside the medium.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 277-282"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00123-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75095108","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: 1
Réaction diffusion en écoulement stationnaire rapide 快速稳定流动扩散反应
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00115-0
Basile Audoly, Henri Berestycki, Yves Pomeau
{"title":"Réaction diffusion en écoulement stationnaire rapide","authors":"Basile Audoly,&nbsp;Henri Berestycki,&nbsp;Yves Pomeau","doi":"10.1016/S1287-4620(00)00115-0","DOIUrl":"10.1016/S1287-4620(00)00115-0","url":null,"abstract":"<div><p>This note is concerned with the speed of propagation of a chemical reaction in a fast, steady and nonuniform flow which may apply to flame propagation in some instances. The structure of the flow is: (1) a parallel shear flow with velocity perpendicular to the average front, where the flame speed is close to the maximum flow speed toward the fresh gases; (2) a periodic cellular structure where the speed of propagation of the reaction grows like the fourth root of the fluid speed.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 255-262"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00115-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90952132","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: 85
Structures instationnaires formées par la rencontre d'un jet et d'un écoulement transverse 由射流和横向流动相遇而形成的机构结构
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00117-4
Yves Brunet , Jean-Noël Blanchard
{"title":"Structures instationnaires formées par la rencontre d'un jet et d'un écoulement transverse","authors":"Yves Brunet ,&nbsp;Jean-Noël Blanchard","doi":"10.1016/S1287-4620(00)00117-4","DOIUrl":"10.1016/S1287-4620(00)00117-4","url":null,"abstract":"<div><p>The meeting of a jet and a cross flow generates unstationary vortices at the boundaries of the jet. This paper describes, with the help of flow visualizations, the evolution of these structures. One of the possible evolution is particularly detailed: the pairing process between two consecutive vortices.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 271-276"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00117-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76085779","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: 1
Le mélange d'échelles en écoulement turbulent non-cisaillé 非剪切湍流尺度的混合
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00127-7
Maher Raddaoui, Roland Schiestel, Marie-Pierre Chauve
{"title":"Le mélange d'échelles en écoulement turbulent non-cisaillé","authors":"Maher Raddaoui,&nbsp;Roland Schiestel,&nbsp;Marie-Pierre Chauve","doi":"10.1016/S1287-4620(00)00127-7","DOIUrl":"10.1016/S1287-4620(00)00127-7","url":null,"abstract":"<div><p>The objective of this experience is to study an exemple of complex turbulent flow produced by two coflows with the same velocity which presents a mixing of scales. This type of flow produces spectral perturbations with interactions between structures with different sizes. The experimental system produces the mixing of a primary flow into two secondary flows, these flows are supplied by two types of honeycombs producing turbulence and that can be differently combined. The motivation of this study is the development of turbulence models applicable in non-equilibrium situations. The experimental contribution presented here is aimed at describing the effects of the honeycombs on spectral distributions.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 247-253"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00127-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83012895","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: 1
Flow of electrolyte through porous piezoelectric medium: macroscopic equations 电解质在多孔压电介质中的流动:宏观方程
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00121-6
Józef Joachim Telega, Ryszard Wojnar
{"title":"Flow of electrolyte through porous piezoelectric medium: macroscopic equations","authors":"Józef Joachim Telega,&nbsp;Ryszard Wojnar","doi":"10.1016/S1287-4620(00)00121-6","DOIUrl":"10.1016/S1287-4620(00)00121-6","url":null,"abstract":"<div><p>The aim of this contribution is to elaborate a general framework for modelling flows of two-ionic species electrolytes through porous piezoelectric media.</p><p>By using the method of two-scale asymptotic expansions, the macroscopic phenomenological equations describing electrokinetics of such a structure are derived and the formulae for the effective mechanical and nonmechanical coefficients are given. Natural jump conditions are assumed on the interfaces between the piezoelectric skeleton and conductive fluid.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 225-230"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00121-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72767883","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: 10
Formulation du contact avec adhérence en élasticité non linéaire entre deux solides déformables 两种可变形固体之间具有非线性弹性粘附的接触配方
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00124-1
A.S. Bretelle , M. Cocu , Y. Monerie
{"title":"Formulation du contact avec adhérence en élasticité non linéaire entre deux solides déformables","authors":"A.S. Bretelle ,&nbsp;M. Cocu ,&nbsp;Y. Monerie","doi":"10.1016/S1287-4620(00)00124-1","DOIUrl":"10.1016/S1287-4620(00)00124-1","url":null,"abstract":"<div><p>Within the framework of finite deformations and using an approach to the kinematics of contact due to A. Curnier, Q.C. He and J.J. Téléga, we propose a spatial thermodynamic formulation for the problem coupling unilateral condition, friction and adhesion. The adhesion is characterized by its intensity introduced by M. Frémond. In the case of frictionless contact between an hyperelastic body and a plane rigid support, with a particular `static' law for the evolution of the intensity of adhesion, the problem can be reduced to a minimization one for which we can show the existence of a solution.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 203-208"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00124-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74035877","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
Numerical simulation of a mixing layer in an adaptive wavelet basis 自适应小波基下混合层的数值模拟
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-05-16 DOI: 10.1016/S1287-4620(00)00106-X
Kai Schneider , Marie Farge
{"title":"Numerical simulation of a mixing layer in an adaptive wavelet basis","authors":"Kai Schneider ,&nbsp;Marie Farge","doi":"10.1016/S1287-4620(00)00106-X","DOIUrl":"10.1016/S1287-4620(00)00106-X","url":null,"abstract":"<div><p>This note presents an adaptive wavelet method to compute two-dimensional turbulent flows. The Navier–Stokes equations in vorticity–velocity form are discretized using a Petrov–Galerkin scheme. The vorticity field is developed into an orthogonal wavelet series where only the most significant coefficients are retained. The testfunctions are adapted to the linear part of the equation so that the resulting stiffness matrix turns out to be the identity. The nonlinear term is evaluated on a locally refined grid in physical space. This numerical scheme is applied to simulate a temporally developing mixing layer. A comparison with a classical pseudo-spectral method is used for validation of the new method. The results show that the formation of Kelvin–Helmholtz vortices is well captured and all scales of the flow are well represented.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 3","pages":"Pages 263-269"},"PeriodicalIF":0.0,"publicationDate":"2000-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00106-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73367301","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: 32
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