| 上海陆域古河道分布及对工程建设影响研究 |
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| 引用本文： | 黄乐萍,范宝春,董刚.上海陆域古河道分布及对工程建设影响研究[J].力学学报,2011,43(2):277-283. |
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| 作者姓名： | 黄乐萍 范宝春 董刚 |
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| 作者单位： | 南京理工大学瞬态物理国家重点实验室 |
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| 摘 要： | 采用直接数值模拟方法, 对槽道湍流中展向振动流向传播的波动壁面的流动
控制和减阻问题进行了研究, 讨论了流向参数k_{x}对Stokes层、湍流拟序结构、湍流猝
发事件以及壁面阻力的影响, 并对此类波动壁面的湍流控制和减阻机理进行了讨论. 结果表
明, 当此类波动壁面被用来调制近壁流动时, 仅低频波对湍流流场具有显著影响, 可导致湍
流猝发事件的频率和强度的显著变化; 波数k_{x}的增大对于湍流猝发事件的频率和强度增
减的影响并不同步, 存在一个最优的波数k_{x}, 在其调制下, 固有流场对诱导流场的影响
最弱, 而诱导流场对固有流场的影响显著, 减阻效果最好.
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| 关 键 词： | 晚更新世 古河道 暗浜 沉积物 工程建设 流砂 |
| 收稿时间： | 2010-05-17 |
| 修稿时间： | 2010-11-17 |
TURBULENT DRAG REDUCTION VIA A STREAMWISE TRAVELING WAVE INDUCED BY SPANWISE WALL OSCILLATION |
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| Huang Leping
,
Fan Baochun
,
Dong Gang.TURBULENT DRAG REDUCTION VIA A STREAMWISE TRAVELING WAVE INDUCED BY SPANWISE WALL OSCILLATION[J].chinese journal of theoretical and applied mechanics,2011,43(2):277-283. |
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| Authors: | Huang Leping Fan Baochun Dong Gang |
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| Institution: | Huang Leping Fan Baochun~(1)) Dong Gang (National Key Lab of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China) |
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| Abstract: | The flow control and drag reduction in turbulent channel flow via streamwise traveling wave induced by spanwise-wall oscillation are investigated by direct numerical simulation(DNS).The effects of streamwise control parameter k_x on the Stokes layer,the near-wall flow structure,turbulent burst events,as well as the skin-friction drag are discussed.In addition,the mechanisms of turbulence suppression and drag reduction via streamwise traveling wave induced by spanwise-wall oscillation are also discussed.The ... |
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| Keywords: | turbulence direct numerical simulation travelling wave drag reduction conditional average |
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