A linear process in wall-bounded turbulent shear flows

被引:101
作者
Kim, J [1 ]
Lim, J [1 ]
机构
[1] Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA
关键词
D O I
10.1063/1.870437
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
A linear process in wall-bounded turbulent shear flows has been investigated through numerical experiments. It is shown that the linear coupling term, which enhances non-normality of the linearized Navier-Stokes system, plays an important role in fully turbulent-and hence, nonlinear-flows. Near-wall turbulence is shown to decay without the linear coupling term. It is also shown that near-wall turbulence structures are not formed in their proper scales without the nonlinear terms in the Navier-Stokes equations, thus indicating that the formation of the commonly observed near-wall turbulence structures are essentially nonlinear, but the maintenance relies on the linear process. Other implications of the linear process are also discussed. (C) 2000 American Institute of Physics. [S1070-6631(00)00708-X].
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页码:1885 / 1888
页数:4
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