32 发卡涡的形成及其结构 - 欢迎访问南京航空航天大学学报编辑部( 四 )


【32 发卡涡的形成及其结构 - 欢迎访问南京航空航天大学学报编辑部】证实了LES 选用适宜的亚格子模型能 对转捩过程的涡系结构进行计算和分析,且模拟结 果与DNS 结果相近 。本文的结论总结如下: T-S波经历线性、非线性发展阶段,在剪切 层作用下,拉伸弯曲形成与流向平行的底层流向涡 对,进而演化成发卡涡结构 。湍流脉动作用破坏了发卡涡的成长,最终造成 发卡涡的涡腿并不是完整对称的 。发卡涡结构演化成涡环后,会在涡腿桥接出新的涡头,如此循环,最终单个T-S 波演变出具 主流向涡与壁面相互作用诱导形成次生流向涡,次生流向涡继续与壁面作用诱导出尺度更小 的新次生流向涡,这一机制是湍流无序化的重要因 发卡涡头部和两腿周围的上喷下扫运动使近壁区与主流区的流体掺混,形成了高低速条带 。高速条带稳定连续,而低速条带在涡环产生位置是 不连续的 。参考文献(References) Detailedflowfield transition CA,Stanford University Press, 1962. Numericalsimulation wall-boundedshear flows FluidMech, 1991( 23): 495-537. Large-eddysimulation boundarylayer developing spatially over flatplate FluidMech, 1996(326):1-36. LiuChaoqun, Chen Lin. DNS latestage structure flowtransition flat-plateboundary layer [R].AIAA 2010-1470,2010. LuPing, Liu Chaoqun. DNS study smalllength scale generation lateboundary layer transition [J],Physica D.2012(241):11-24. LuPing, Liu Chaoqun. Numerical investi -gation multiplevortex rings formation lateboundary-layer transition [J].Computers Fluids,2013( 71): 156-168. ChenLin, Tang Dengbin, Lu Ping, et al. Evolution vortexstructures turbulentspots transitionalboundary layers Sci.China Phys. Mech. Astron. 2011,54(5): 986–990. etal. Systematic investigations 3Dacoustic receptivity unsteadydisturbances. Experiment DNS[R].Notes NumericalFluid Mechanics Multidisciplinary,Berlin:Springer-Berlin Heidelberg,2004. 力学进展,2009,39(4):480-507. Lee Cunbiao, Wu Jiezhi. Transition wall-boundedflows AppliedMechanics Reviews, 2009,39(4):480-507. [10] Kachanov universalmechanism turbulenceproduction wallshear flows. Notes NumericalFluid Mechanics Multidisciplinary,Berlin:Springer-Berlin Heidelberg,2004. [11] Lele Compactfinite difference schemes spectral-likeresolution ComputationalPhysics,1992( 103):16~42. [12] Shu Efficientimplementation essentiallynon-oscillatory shock-capturing scheme Comput.Phys. 1988(77):439-471. [13] Germano etal. dynamicsubgrid-scale eddy viscosity model[J]. Physics Fluids,1991(3):1760-1765.[14] Shi Wanli, Ge Ning, Chen Lin. Numerical simulation horseshoe-shapedvortex near-wallregion turbulentboundary layer NanjingUniversity Astronautics.2011,28(1):48-56. [15] 边界层转捩过程的涡系结构和转捩机理研究[D].南京:南京航空航天大学,2010. Chen Lin. Study coherentstructure boundarylayer transition[D].Nanjing: Nanjing University Astronautics,2010.[16] 湍流边界层拟序结构的实验研究[J].力学进展,2006,36(3) :373-388. Lian Qixiang, Experiment study coherentstructure turbulentboundary layer[J]. Applied Mechanics Reviews,2006,36(3): 373-388. [17] Adrian, Stochasticestimation turbulentelds[R]. Mechanics Engeering. Chicago,University illinoispress,1995. [18] 湍流边界层中下扫流与“反发卡涡”[J]. 物理学报,2004,53(7):2226-2232. Lian Qixiang, Guo Hui. Sweep flow anti-hairpinvortex turbulentboundary layer PhysicsJournal, 2004,53(7):2226-2232.


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