三次元低レイノルズ数スリット噴流の直接数値計算による乱流遷移過程の検討

概要

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Results of the transition to turbulence in three dimensional low Reynolds number slit nozzle free jet (Re=800) are presented. A direct numerical simulation (MAC method) is used, based on the fourth order central difference scheme for convection terms and the second order Runge-Kutta method for time developing terms. Computational cells are smaller than Kolmogorov's micro-scale. Calculated results are verified by experimental turbulent characteristics. We examine the transition to turbulence by calculated results. We show various velocity wave profiles with time in the jet. The time-spatial characteristic maps of velocities, convection terms and vorticities show the processes of merging vortices which cause mainly the transition to turbulence and also show non linear convective effects.
1999-03-25