Nonlinearly most dangerous disturbance for high-speed boundary-layer transition
作者: Reza JahanbakhshiTamer A. Zaki
作者单位: 11 Department of Mechanical Engineering , Johns Hopkins University , Baltimore , MD 21218-2682 , USA
刊名: Journal of Fluid Mechanics, 2019, Vol.876 , pp.87-121
来源数据库: Cambridge University Press Journal
DOI: 10.1017/jfm.2019.527
原始语种摘要: Laminar-to-turbulent transition in a zero-pressure-gradient boundary layer at Mach 4.5 is studied using direct numerical simulations. For a given level of total disturbance energy, the inflow spectrum was designed to correspond to the nonlinearly most dangerous condition that leads to the earliest possible transition Reynolds number. The synthesis of the inlet disturbance is formulated as a constrained optimization, where the control vector is comprised of the amplitudes and relative phases of the inlet modes; the constraints are the prescribed total energy and that the flow evolution satisfies the full nonlinear compressible Navier–Stokes equations; the cost function is defined in terms of the mean skin-friction coefficient and, once maximized, ensures the earliest possible transition...
全文获取路径: Cambridge U Press  (合作)
影响因子:2.183 (2012)

  • transition 转移
  • inlet 峡湾
  • inflow 进水量
  • corresponding 对应的
  • condition 条件
  • disturbance 扰乱
  • higher 
  • dangerous 危险的
  • level 水准
  • oblique 间接的