Effect of the parameters of traveling waves created by blowing and suction on the relaminarization phenomena in fully developed turbulent channel flow
Effect of the parameters of traveling waves created by blowing and suction on the relaminarization phenomena in fully developed turbulent channel flow
复制标题
吹吸产生的行波参数对完全发展的湍流通道流中再层化现象的影响
DOI：
10.1063/1.4851256
复制
发表时间：
2014
影响因子：
4.6
通讯作者：
A. Murata
中科院分区：
文献类型：
--
作者：
H. Mamori;K. Iwamoto;A. Murata
对吹吸式行波控制的充分发展的槽道湍流流动进行了一系列直接数值模拟。当波在下游方向传播时，对于某些参数组，观察到了再透明化，即从湍流到层流的转变。由于下游行波产生阻力，流动的阻力略大于相应的层流。参数研究表明，产生再分层的控制参数范围是波速和波幅，波速和波幅随对应于层流的平均体流率而变化，波长随粘性尺度变化。当发生再分层时，波幅、波长和波速分别在0.1、200和1.5的范围内。这些范围是由置换厚度组织的，当重新定位时，这些范围在3到10个墙单位之间。
A series of direct numerical simulations of a fully developed turbulent channel flow controlled by traveling waves induced by blowing and suction is performed. Relaminarization, i.e., the transition from turbulent flow to laminar flow, is observed for some sets of parameter when the wave is traveling in the downstream direction. Since the downstream traveling wave produces the drag, the drag of the flow is slightly larger than the corresponding laminar flow. A parametric study is performed, and reveals that the range of control parameters that produce relaminarization are the wave speed and amplitude of the wave which scale with the mean bulk flow rate corresponding to laminar flow and the wavelength which scales with the viscous scale. When relaminarization occurs, the amplitude of the wave, wavelength, and wave speed are in the range of a/u¯ lam >0.1, 200 1.5, respectively. These ranges are organized by displacement thickness and are between 3 and 10 wall units when the relamin...