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| 1 | Drag reduction of wall bounded incompressible turbulent flow based on active dimples/pimples显示文摘The control of turbulence by dimples/pimples has drawn more and more attention. The objective of this paper is to investigate the effectiveness of the active dimples/pimples for the drag reduction in the incompressible turbulent flow. Firstly, the drag reduction by the opposition control based on active dimples/pimples at the lower wall is studied via the direct numerical simulation of the turbulent channel flow. It is found that large active dimples/pimples can not suppress the streamwise vortices significantly and thus almost no drag reduction is achieved. Small active dimples and pimples with the diameter of one fourth of the streak width can both reduce the friction drag, but pimples will induce a larger pressure drag than dimples. Then the suboptimal control scheme is examined based on small active dimples using the spanwise wall shear information only. It is shown that the friction drag decreases by about 4.5% but the total drag is only reduced by about 2.7% abated by the pressure drag. Compared with the actuation of the all-point blowing/suction or the all-point wall movement, the effectiveness of the turbulent drag reduction based on active shallow dimples is much smaller. | 葛铭纬 方乐 刘永前 | 2017 | Journal of Hydrodynamics2017，29，2： | 5 |
| 2 | Drag reduction in turbulent channel flow using bidirectional wavy Lorentz force显示文摘Turbulent control and drag reduction in a channel flow via a bidirectional traveling wave induced by spanwise oscillating Lorentz force have been investigated in the paper.The results based on the direct numerical simulation(DNS)indicate that the bidirectional wavy Lorentz force with appropriate control parameters can result in a regular decline of near-wall streaks and vortex structures with respect to the flow direction,leading to the effective suppression of turbulence generation and significant reduction in skin-friction drag.In addition,experiments are carried out in a water tunnel via electro-magnetic(EM)actuators designed to produce the bidirectional traveling wave excitation as described in calculations.As a result,the actual substantial drag reduction is realized successfully in these experiments. | HUANG LePing CHOI KwingSo FAN BaoChun CHEN YaoHui | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，11： | 3 |
| 3 | 球窝的流动控制及分离转捩特性研究显示文摘流体经过一定的逆压梯度容易发生流动分离从而大大减小流动效率,球窝结构具有良好的流动控制效果,在机翼、航空发动机、汽轮机叶片等工业领域有较大的应用前景。对一典型收缩扩张通道的流动分离转捩状况进行了数值模拟,并提出了一种带有球窝结构的被动控制方法。研究结果表明:球窝结构作为一种被动流动控制方法,布置在具有明显逆压梯度的通道上能起到良好的流动控制作用,并且能诱导层流边界层提前向湍流边界层转捩,抑制了通道中的流动分离,减小分离泡的尺度,其中球窝的布置位置以及流动Re均对球窝的控制作用有重要影响。球窝的引入还将减小通道的总压损失系数,起到了流动减阻的效果,表明球窝结构是一种较优的流动控制方法。 | 谢永慧 申仲旸 张荻 | 2012 | 热科学与技术2012，11，4： | 0 |
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