伴流空間発展問題の直接シミュレーション

概要

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The transition mechanism in a plane wake was studied by means of direct numerical simulations. The incompressible time-dependent Navier-Stokes equations were solved using finite difference method in the streamwise direction, pseudospectral Fourier method in the cross-stream direction, and a third-order compact Runge-Kutta scheme for time advancement. The unstable eigenfunctions of the Orr-Sommerfeld equations were used to perturb the Gaussian inlet profile. The numerical methods applied to the spatially developing wake, as well as, the time developing wake, are described in this paper. The numerical results reveal that the phase jitter around the fundamental frequency plays a critical role in generating vortices of random shape and spacing, so does an effective acceleration to the turbulent wake.
社団法人日本機械学会の論文
1991-08-25