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

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Champ dynamique dans une cellule d'échangeur à vortex : 1. Régime d'entrée laminaire 涡流换热器单元内的动态场:1。层流输入系统
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-07-01 DOI: 10.1016/S1620-7742(01)01358-7
Stéphane Petitot , Abdel Lyazid , René Devienne
{"title":"Champ dynamique dans une cellule d'échangeur à vortex : 1. Régime d'entrée laminaire","authors":"Stéphane Petitot ,&nbsp;Abdel Lyazid ,&nbsp;René Devienne","doi":"10.1016/S1620-7742(01)01358-7","DOIUrl":"10.1016/S1620-7742(01)01358-7","url":null,"abstract":"<div><p>Numerical simulation and LDV measurements are performed for laminar inlet flow condition in a vortex exchange chamber with isothermal conditions. Newtonian and non-Newtonian fluids were used. Experimental measurements are compared to results of numerical computations with good agreement. Both show the existence of a secondary flow generated by hydrodynamical instabilities due to streamline curvature. The main vortex flow appears then to be restricted by this secondary flow.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 7","pages":"Pages 503-508"},"PeriodicalIF":0.0,"publicationDate":"2001-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01358-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83186851","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
Chaos for a class of linear kinetic models 一类线性动力学模型的混沌
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01353-8
Jacek Banasiak , Mirosław Lachowicz
{"title":"Chaos for a class of linear kinetic models","authors":"Jacek Banasiak ,&nbsp;Mirosław Lachowicz","doi":"10.1016/S1620-7742(01)01353-8","DOIUrl":"10.1016/S1620-7742(01)01353-8","url":null,"abstract":"<div><p>In recent years it was observed that chaotic behaviour can occur in some infinite–dimensional linear systems. An example of this type, related to a kinetic model (death process), has been previously reported. In this paper we generalize these earlier results to the case of variable coefficients, showing that the property of being chaotic can be in a certain sense stable. On the other hand the ‘opposite’ birth process cannot be chaotic.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 439-444"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01353-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82523609","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: 23
Linear iterative solvers based on perturbation techniques 基于摄动技术的线性迭代求解器
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01357-5
Jean-Marc Cadou , Naima Moustaghfir , El Hassan Mallil , Noureddine Damil , Michel Potier-Ferry
{"title":"Linear iterative solvers based on perturbation techniques","authors":"Jean-Marc Cadou ,&nbsp;Naima Moustaghfir ,&nbsp;El Hassan Mallil ,&nbsp;Noureddine Damil ,&nbsp;Michel Potier-Ferry","doi":"10.1016/S1620-7742(01)01357-5","DOIUrl":"10.1016/S1620-7742(01)01357-5","url":null,"abstract":"<div><p>In this paper, we propose a new class of algorithms to solve large scale linear algebraic equations. This method is based on homotopy, perturbation technique and Padé approximants.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 457-462"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01357-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75998800","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: 12
Some issues related to the modeling of interfacial areas in gas–liquid flows, II. Modeling the source terms for dispersed flows 关于气液流动界面区域建模的若干问题，2。对分散流的源项进行建模
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01348-4
Jean-Marc Delhaye
{"title":"Some issues related to the modeling of interfacial areas in gas–liquid flows, II. Modeling the source terms for dispersed flows","authors":"Jean-Marc Delhaye","doi":"10.1016/S1620-7742(01)01348-4","DOIUrl":"10.1016/S1620-7742(01)01348-4","url":null,"abstract":"<div><p>The first part of this paper dealt with the conceptual issues encountered in the definition of the interfacial area and in the derivation of a transport equation. The second part has the following objectives: 1. to address the closure issues for the source terms appearing in the transport equation when dealing with a bubbly flow in a vertical pipe; 2. to provide a list of open questions to be answered before introducing a transport equation for the interfacial area concentration in a thermal–hydraulic computer code.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 473-486"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01348-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90142069","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: 11
Analyse asymptotique d'un assemblage collé en élasticité non linéaire 非线性弹性粘接接头的渐近分析
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01345-9
Françoise Krasucki , Arnaud Münch , Yves Ousset
{"title":"Analyse asymptotique d'un assemblage collé en élasticité non linéaire","authors":"Françoise Krasucki ,&nbsp;Arnaud Münch ,&nbsp;Yves Ousset","doi":"10.1016/S1620-7742(01)01345-9","DOIUrl":"10.1016/S1620-7742(01)01345-9","url":null,"abstract":"<div><p>Within the framework of nonlinear elasticity, we study the behaviour of a bonded joint formed by two adherends and a joint of thickness <span><math><mtext>εh</mtext></math></span>. When the stiffness of the adhesive is of order <span><math><mtext>ε</mtext></math></span> with respect to the adherends, the analysis gives us a limit model where the constitutive equations of the adherend are only linear. We show existence of solutions of the model and discuss the unicity.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 429-434"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01345-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80703980","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: 5
Modélisation thermique d'une interface solide–fluide par fonction de transfert 通过传递函数对固液界面进行热建模
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01344-7
Franck Guigoures, Jean-Pierre Maye, Jean-Philippe Garnier
{"title":"Modélisation thermique d'une interface solide–fluide par fonction de transfert","authors":"Franck Guigoures,&nbsp;Jean-Pierre Maye,&nbsp;Jean-Philippe Garnier","doi":"10.1016/S1620-7742(01)01344-7","DOIUrl":"10.1016/S1620-7742(01)01344-7","url":null,"abstract":"<div><p>A thermal modelling of a solid–fluid interface is proposed. The developed procedure is based on a numerical identification, in a dimensionless space, of a unique transfer function, associated with a recurrent relation. The method is usable for direct or inverse problems and well fit for control–command applications. An inverse numerical simulation example is presented for a random thermal excitation.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 425-428"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01344-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90496520","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
Étude numérique des jets turbulents non-isothermes avec deux schémas de fermeture k–ε 两种k - ε闭合图的非等温湍流射流的数值研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01337-X
Mohamed Hichem Gazzah, Mohamed Sassi
{"title":"Étude numérique des jets turbulents non-isothermes avec deux schémas de fermeture k–ε","authors":"Mohamed Hichem Gazzah,&nbsp;Mohamed Sassi","doi":"10.1016/S1620-7742(01)01337-X","DOIUrl":"10.1016/S1620-7742(01)01337-X","url":null,"abstract":"<div><p>This article presents a numerical study of a non-isothermal axisymmetric turbulent jet by two <span><math><mtext>k</mtext></math></span>–<span><math><mtext>ε</mtext></math></span> closure models based on Favre or Reynolds averaging, respectively. The numerical results are in good agreement with the experimental ones found in the literature. We show, in particular, the advantage of treating separately the turbulent mass flux terms and their contribution to predicting variable density effects. A mixing efficiency definition is finally introduced. It is observed that the mixing efficiency increases when the density ratio between the turbulent jet and the ambient gas is reduced.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 417-423"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01337-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74837205","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: 2
Theory of cellular detonations in gases. Part 1. Stability limits at strong overdrive 气体中细胞爆炸理论。第1部分。在强超速时的稳定性限制
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01351-4
Paul Clavin, Longting He
{"title":"Theory of cellular detonations in gases. Part 1. Stability limits at strong overdrive","authors":"Paul Clavin,&nbsp;Longting He","doi":"10.1016/S1620-7742(01)01351-4","DOIUrl":"10.1016/S1620-7742(01)01351-4","url":null,"abstract":"<div><p>A stability analysis of detonation waves is carried out at strong overdrive and in the Newtonian limit (small difference between the specific heats at constant pressure and at constant volume). The instability threshold is determined. An analytical expression of the dispersion relation and a linear integral-differential equation for the evolution of the detonation front, both valid at onset of the instability, are obtained. The analysis is valid for an arbitrary chemistry compatible with stable or weakly unstable gaseous detonations.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 463-471"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01351-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73090557","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
Numerical simulation of the motion of neutrally buoyant particles in the plane Poiseuille flow of a Newtonian fluid 中性浮力粒子在牛顿流体平面泊泽维尔流中运动的数值模拟
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01350-2
Tsorng-Whay Pan
{"title":"Numerical simulation of the motion of neutrally buoyant particles in the plane Poiseuille flow of a Newtonian fluid","authors":"Tsorng-Whay Pan","doi":"10.1016/S1620-7742(01)01350-2","DOIUrl":"10.1016/S1620-7742(01)01350-2","url":null,"abstract":"<div><p>In this note we discuss the generalization of a Lagrange multiplier based fictitious domain method to the simulation of migration of neutrally buoyant particles in plane Poiseuille flow of a Newtonian fluid. The migration away from the center of the channel is believed to be an effect of the curvature of the velocity profile. We found this effect is not weakened by the presence of many particles, but instead by the collisions among the particles. Experiments and simulations show that the particles concentrate in the central region where the shear rate is low.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 435-438"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01350-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85665594","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
Super-réseaux et quasi-cristaux dans les systèmes bistables 双稳态系统中的超晶格和准晶体
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-06-01 DOI: 10.1016/S1620-7742(01)01332-0
Guy Dewel , Mustapha Bachir , Pierre Borckmans , Stephane Métens
{"title":"Super-réseaux et quasi-cristaux dans les systèmes bistables","authors":"Guy Dewel ,&nbsp;Mustapha Bachir ,&nbsp;Pierre Borckmans ,&nbsp;Stephane Métens","doi":"10.1016/S1620-7742(01)01332-0","DOIUrl":"10.1016/S1620-7742(01)01332-0","url":null,"abstract":"<div><p>We describe the formation of spatial structures generated by diffusive instabilities in bistable systems. It is shown that the coupling between the different spatial modes emanating from the two homogeneous states can give rise to self-parametric instabilities favoring the occurrence of resonant quasiperiodic structures such as superlattices or quasipatterns.</p></div>","PeriodicalId":100302,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics","volume":"329 6","pages":"Pages 411-416"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1620-7742(01)01332-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92604637","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
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