圧縮性正方形ジェットの数値シミュレーション Numerical Simulation of Spatially Developing Compressible Square Jet
Spatially developing compressible square jet was simulated by numerically solving the three-dimensional Navier-Stokes equations. A fourth-order non-oscillatory scheme and Roe's approximate Riemann solver are used in space discretization, and the third-order Runge-Kutta scheme is utilized as time integration. This code has an advantage that it can be easily extended to any order of accuracy in space and time. In the case of subsonic jet, two types of vortex ring behavior were observed. One vortex expands outward from the centerline, while the other slightly contracts inward. Vortex pairing was not observed unlike the round jet, and a symmetric vortex ring was broken into several longitudinal vortices in the downstream. In the case of supersonic jet, vortex ring was asymmetric even in the roll-up, and no more vortex pairing was observed than in the subsonic case. In both subsonic and supersonic jets, longitudinal vortices in the downstream slow down the growth rates of shear layer and three-dimensionalization. The growth of shear layer in square jet is greater than that of round jet, although the core of square jet is maintained up to further downstream.
- 日本航空宇宙学会誌 = Journal of the Japan Society for Aeronautical and Space Sciences
日本航空宇宙学会誌 = Journal of the Japan Society for Aeronautical and Space Sciences 46(529), 111-119, 1998-02