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

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Diffraction par des surfaces rigides de révolution d'un champ acoustique harmonique en hautes fréquences 高频谐波声场的刚性旋转表面衍射
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86953-9
Hassan Ouariri
{"title":"Diffraction par des surfaces rigides de révolution d'un champ acoustique harmonique en hautes fréquences","authors":"Hassan Ouariri","doi":"10.1016/S1251-8069(97)86953-9","DOIUrl":"10.1016/S1251-8069(97)86953-9","url":null,"abstract":"<div><p>The aim of this paper is the calculation, at high frequencies, of the diffracted pressure of an acoustic wave by axisymmetrical rigid surfaces. Using an integral formulation, we present herein a mixed approach based on the asymptotic expansion theory, in order to reduce the space of the integration domain, and on the collocation method, used to improve the numerical computation. This numerical software leads to an interesting saving of computation time. This approach is developed in the study of an analytical case.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 55-60"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86953-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"94019923","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
Coherence function of a spherical acoustic wave after passing through a turbulent jet 球面声波通过湍流射流后的相干函数
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86951-5
Vladimir E. Ostashev , Philippe Blanc-Benon , Daniel Juvé
{"title":"Coherence function of a spherical acoustic wave after passing through a turbulent jet","authors":"Vladimir E. Ostashev ,&nbsp;Philippe Blanc-Benon ,&nbsp;Daniel Juvé","doi":"10.1016/S1251-8069(97)86951-5","DOIUrl":"10.1016/S1251-8069(97)86951-5","url":null,"abstract":"<div><p>The paper deals with a comparison between experimental data obtained by <span>Blanc-Benon (1984)</span> and theoretical predictions of the coherence function of a spherical sound wave after passing through a turbulent jet. The predictions are based on the theory of sound propagation in moving random media recently developed by <span>Ostashev (1994</span>, 1997), which correctly takes into account the effects of an isotropic vector random field of the medium velocity fluctuations on line-of-sight sound propagation. It is shown that the theoretical predictions fit the data well.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 39-45"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86951-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"111160515","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
Histogramme des fluctuations scalaires dans le mélange turbulent transitoire 瞬态湍流混合物中标量波动的直方图
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86948-5
Emmanuel Villermaux, Claudia Innocenti, Jérôme Duplat
{"title":"Histogramme des fluctuations scalaires dans le mélange turbulent transitoire","authors":"Emmanuel Villermaux,&nbsp;Claudia Innocenti,&nbsp;Jérôme Duplat","doi":"10.1016/S1251-8069(97)86948-5","DOIUrl":"10.1016/S1251-8069(97)86948-5","url":null,"abstract":"<div><p>The concentration fluctuation PDF resulting from the transient turbulent mixing of a scalar blob exhibits rapidly a decreasing exponential shape, parametrised by a mixing time <em>t</em><sub>s</sub> = 0.12 d/u ln(5Sc) which depends on the injection time of the blob in the medium d/u and on the Schmidt number Sc.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 21-26"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86948-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"99407794","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: 9
Caractérisation de la dispersion avec un modèle fractionnaire 用分数模型表征色散
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86949-7
Mustapha Cherifi , Ganming He , Victor Mastrangelo , Michèle Mastrangelo , Marcelo Piva , Susana Gabbanelli , Marta Rosen , José Eduardo Wesfried
{"title":"Caractérisation de la dispersion avec un modèle fractionnaire","authors":"Mustapha Cherifi ,&nbsp;Ganming He ,&nbsp;Victor Mastrangelo ,&nbsp;Michèle Mastrangelo ,&nbsp;Marcelo Piva ,&nbsp;Susana Gabbanelli ,&nbsp;Marta Rosen ,&nbsp;José Eduardo Wesfried","doi":"10.1016/S1251-8069(97)86949-7","DOIUrl":"10.1016/S1251-8069(97)86949-7","url":null,"abstract":"<div><p>We use the fractional dispersion concept to analyse the anomalous diffusion regime shown in a tracer dispersion in a hydrodynamical Taylor-Couette experiment. The anomalous diffusion is characterized with a parameter a (diffusion exponent), equal to two for the Gaussian diffusion. The results of the fractional advection-diffusion equa lion are compared to the concentration curves of the residence time distributions obtained in the experiment and to those from a coupled advection-diffusion model. The diffusion exponent, the generalized diffusion coefficient and the axial velocity are evaluated by fit.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 27-32"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86949-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"99052858","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
Stabilité linéaire tridimensionnelle de l'écoulement dans un divergent en rotation 旋转分流器中流动的三维线性稳定性
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86947-3
Marwan Al-Farkh, Mahmoud Hamadiche
{"title":"Stabilité linéaire tridimensionnelle de l'écoulement dans un divergent en rotation","authors":"Marwan Al-Farkh,&nbsp;Mahmoud Hamadiche","doi":"10.1016/S1251-8069(97)86947-3","DOIUrl":"10.1016/S1251-8069(97)86947-3","url":null,"abstract":"<div><p>The linear temporal three-dimensional instability of incompressible viscous flow in a rotating divergent channel is studied. The boundary between stable and unstable regions is plotted as a function of the different physical parameters of the problem. It is shown that the instability is caused by the channel rotation when the half-angle of the channel, α, is small and it is caused by the channel expansion for large α. When α is taken constant, we found that rotation has the same effect as in plane channel flow, where the basic flow is destabilized by weak rotation and stabilized by strong rotation.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 13-20"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86947-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"100477276","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
Méthode de Monte-Carlo par échanges pour le calcul des bilans radiatifs au sein d'une cavité 2D remplie de gaz 用蒙特卡罗交换法计算二维气体腔内的辐射平衡
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86950-3
Jean-Louis Dufresne , Richard Fournier , Jean-Yves Grandpeix
{"title":"Méthode de Monte-Carlo par échanges pour le calcul des bilans radiatifs au sein d'une cavité 2D remplie de gaz","authors":"Jean-Louis Dufresne ,&nbsp;Richard Fournier ,&nbsp;Jean-Yves Grandpeix","doi":"10.1016/S1251-8069(97)86950-3","DOIUrl":"10.1016/S1251-8069(97)86950-3","url":null,"abstract":"<div><p>A formulation is presented based on the reciprocity principle in which radiative budgets are expressed as sums of Net Exchange Rates between all volume and surface elements. On this basis, a Monte-Carlo Method has been developed that proves to be numerically very efficient compared to standard Analogue Monte-Carlo Methods. It was used for computation of radiative budgets inside a two-dimensional cavity field with a participating gas. Strongly irregular grids and a wide range of optical thicknesses can be studied with this method.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 33-38"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86950-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112221979","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: 9
Une résolution des minimax discrets appliquée au calcul à la rupture 应用于断裂计算的离散最小极大值解析
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86945-X
Sylvain Turgeman, Mohamed Guessasma
{"title":"Une résolution des minimax discrets appliquée au calcul à la rupture","authors":"Sylvain Turgeman,&nbsp;Mohamed Guessasma","doi":"10.1016/S1251-8069(97)86945-X","DOIUrl":"10.1016/S1251-8069(97)86945-X","url":null,"abstract":"<div><p>The static extreme-load approach, under certain conditions, appears to be the solution of an unconstrained discrete minimax problem. It is shown that it is possible to eliminate the operator Max in this problem. The subsequent problem involves minimizing a regularized function without constraints. An application to the determination of the macroscopic strength of a punched material exhibits the efficiency of this method.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 1-4"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86945-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"98101647","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
Note rédigée à l'invitation du Comité de lecture 应阅读委员会邀请编写的说明
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1998-01-01 DOI: 10.1016/S1251-8069(97)86955-2
{"title":"Note rédigée à l'invitation du Comité de lecture","authors":"","doi":"10.1016/S1251-8069(97)86955-2","DOIUrl":"https://doi.org/10.1016/S1251-8069(97)86955-2","url":null,"abstract":"","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"326 1","pages":"Pages 69-78"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)86955-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136503175","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
A probabilistic approach for fragmentation of brittle materials under dynamic loading 动态载荷下脆性材料破碎的概率方法
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-12-01 DOI: 10.1016/S1251-8069(97)82333-0
Christophe Denoual , Gilles Barbier , François Hild
{"title":"A probabilistic approach for fragmentation of brittle materials under dynamic loading","authors":"Christophe Denoual ,&nbsp;Gilles Barbier ,&nbsp;François Hild","doi":"10.1016/S1251-8069(97)82333-0","DOIUrl":"10.1016/S1251-8069(97)82333-0","url":null,"abstract":"<div><p>Dynamic loadings produce high stress waves leading to the fragmentation of brittle materials such as ceramics. The main mechanism used to explain the change of the number of fragments with stress rate is an obscuration phenomenon. After the presentation of a probabilistic approach, the evolution of the number of nucleated flaws and a damage model are derived.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 12","pages":"Pages 685-691"},"PeriodicalIF":0.0,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)82333-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"110518378","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: 21
Caractérisation du pouvoir incrustant des eaux d'irrigation du cap Bon par chronoélectrogravimétrie 用时间电重力法表征cap Bon灌溉水的结垢能力
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-12-01 DOI: 10.1016/S1251-8069(97)82338-X
Robert Rosset , Mohamed Ben Amor , Ali Ghorbel
{"title":"Caractérisation du pouvoir incrustant des eaux d'irrigation du cap Bon par chronoélectrogravimétrie","authors":"Robert Rosset ,&nbsp;Mohamed Ben Amor ,&nbsp;Ali Ghorbel","doi":"10.1016/S1251-8069(97)82338-X","DOIUrl":"10.1016/S1251-8069(97)82338-X","url":null,"abstract":"<div><p>Chemical plugging by scale precipitation is a major problem with localised irrigation techniques. Chronoelectrogravimetry allows the evaluation of the incrusting character of waters. The method was applied to irrigation waters of the Cap Bon region.</p></div>","PeriodicalId":100304,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy","volume":"325 12","pages":"Pages 727-732"},"PeriodicalIF":0.0,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8069(97)82338-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"110873282","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
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