arXiv: Chaotic Dynamics最新文献_第10页

Numerical Study on Randomization in Late Boundary Layer Transition 边界层后期过渡随机化的数值研究

arXiv: Chaotic Dynamics Pub Date : 2012-01-09 DOI: 10.2514/6.2012-748

P. Lu, M. Thapa, Chaoqun Liu

{"title":"Numerical Study on Randomization in Late Boundary Layer Transition","authors":"P. Lu, M. Thapa, Chaoqun Liu","doi":"10.2514/6.2012-748","DOIUrl":"https://doi.org/10.2514/6.2012-748","url":null,"abstract":"The mechanism of randomization in late boundary layer transition is a key issue of late boundary layer transition and turbulence theory. We studied the mechanism carefully by high order DNS. The randomization was originally considered as a result of large background noise and non-periodic spanwise boundary conditions. It was addressed that the large ring structure is affected by background noises first and then the change of large ring structure affects the small length scale quickly, which directly leads to randomization and formation of turbulence. However, what we observed is that the loss of symmetry starts from the middle level rings while the top and bottom rings are still symmetric. The nonsymmetric structure of second level rings will influence the small length scales at the boundary layer bottom quickly. The symmetry loss at the bottom of the boundary layer is quickly spread to up level through ejections. This will lead to randomization of the whole flow field. Therefore, the internal instability of multiple level ring structure, especially the middle ring cycles, is the main reason for flow randomization, but not the background noise. A hypothesis is given that the loss of symmetry may be caused by the shift from C-type transition to K-type transition or reverses.","PeriodicalId":166772,"journal":{"name":"arXiv: Chaotic Dynamics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129984567","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: 13

Coupled nonlinear oscillators: metamorphoses of amplitude profiles for the approximate effective equation - the case of 1:3 resonance 耦合非线性振子:近似有效方程振幅分布的变形- 1:3共振的情况

arXiv: Chaotic Dynamics Pub Date : 2011-11-20 DOI: 10.5506/APhysPolB.43.1275

J. Kyzioł, A. Okniński

引用次数: 6

Collisionless kinetic theory of rolling molecules 滚动分子的无碰撞运动理论

arXiv: Chaotic Dynamics Pub Date : 2011-09-28 DOI: 10.3934/krm.2013.6.429

Darryl D. Holm, V. Putkaradze, C. Tronci

引用次数: 1

Fractional Zaslavsky and Hénon Discrete Maps 分数Zaslavsky和hsamnon离散映射

arXiv: Chaotic Dynamics Pub Date : 2011-07-26 DOI: 10.1007/978-3-642-12343-6_1

V. E. Tarasov

引用次数: 11

Pseudo resonance induced quasi-periodic behavior in stochastic threshold dynamics 随机阈值动力学中伪共振诱导的准周期行为

arXiv: Chaotic Dynamics Pub Date : 2011-06-07 DOI: 10.1142/S0219493711003309

P. Ditlevsen, H. Braun

引用次数: 0

Non Hamiltonian Chaos from Nambu Dynamics of Surfaces 曲面的Nambu动力学中的非哈密顿混沌

arXiv: Chaotic Dynamics Pub Date : 2011-05-01 DOI: 10.1142/9789814350341_0012

M. Axenides

引用次数: 3

Enstrophy bounds and the range of space-time scales in the hydrostatic primitive equations 流体静力原始方程中的熵界和时空尺度范围

arXiv: Chaotic Dynamics Pub Date : 2011-04-03 DOI: 10.1103/PHYSREVE.87.031001

J. Gibbon, Darryl D. Holm

引用次数: 2

Complete Chaotic Mixing in an Electro-osmotic Flow by Destabilization of Key Periodic Pathlines 基于关键周期路径失稳的电渗透流动完全混沌混合

arXiv: Chaotic Dynamics Pub Date : 2011-02-07 DOI: 10.1063/1.3596127

R. Chabreyrie, C. Chandre, P. Singh, N. Aubry

引用次数: 11

A hierarchy of length scales for weak solutions of the three-dimensional Navier-Stokes equations 三维Navier-Stokes方程弱解的长度尺度层次

arXiv: Chaotic Dynamics Pub Date : 2010-12-16 DOI: 10.4310/CMS.2012.V10.N1.A7

J. Gibbon

引用次数: 19

Stretching and folding diagnostics in solutions of the three-dimensional Euler and Navier-Stokes equations 三维Euler和Navier-Stokes方程解中的拉伸和折叠诊断

arXiv: Chaotic Dynamics Pub Date : 2010-12-16 DOI: 10.1017/CBO9781139235792.010

J. Gibbon, Darryl D. Holm

{"title":"Stretching and folding diagnostics in solutions of the three-dimensional Euler and Navier-Stokes equations","authors":"J. Gibbon, Darryl D. Holm","doi":"10.1017/CBO9781139235792.010","DOIUrl":"https://doi.org/10.1017/CBO9781139235792.010","url":null,"abstract":"Two possible diagnostics of stretching and folding (S&F) in fluid flows are discussed, based on the dynamics of the gradient of potential vorticity ($q = bomcdotnablatheta$) associated with solutions of the three-dimensional Euler and Navier-Stokes equations. The vector $bdB = nabla q times nablatheta$ satisfies the same type of stretching and folding equation as that for the vorticity field $bom $ in the incompressible Euler equations (Gibbon & Holm, 2010). The quantity $theta$ may be chosen as the potential temperature for the stratified, rotating Euler/Navier-Stokes equations, or it may play the role of a seeded passive scalar for the Euler equations alone. The first discussion of these S&F-flow diagnostics concerns a numerical test for Euler codes and also includes a connection with the two-dimensional surface quasi-geostrophic equations. The second S&F-flow diagnostic concerns the evolution of the Lamb vector $bsD = bomtimesbu$, which is the nonlinearity for Euler's equations apart from the pressure. The curl of the Lamb vector ($boldsymbol{varpi} := bsD$) turns out to possess similar stretching and folding properties to that of the $bdB$-vector.","PeriodicalId":166772,"journal":{"name":"arXiv: Chaotic Dynamics","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121229637","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: 6