Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2000, Volume7

Issue 2

102 pages

Issue price - $140.00

Tong-Miin Liou
College of Engineering, Feng Chia University, Taichung; and Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 407, ROC

Po-Wen Hwang
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, R.O.C.

Numerical flow visualization is performed to study spatially developing compressible turbulent-free shear layers resulting from the interactions of supersonic and subsonic streams whose study has received limited attention. The time-dependent, two-dimensional (2-D), and three-dimensional (3-D) compressible conservation equations are solved with the Smagorinsky subgrid-scale turbulence model. The numerical code uses the finite-volume technique, which involves alternating in time the second-order explicit MacCormack's and modified Godunov's schemes. The temporal evolutions of the 2-D and 3-D flow structures are visualized in terms of the instantaneous velocity fields, mixture fraction, and vorticity contours. In addition, the entrainment of the fluid into the coherent vortices and the interaction of the two coflowing fluid streams with different velocity regimes are visualized by the streaklines and pathlines. The presence of streamwise vortices for the case of the 3-D-free shear flow, lacking for the 2-D case, is clearly revealed from the numerical flow visualization. The influences of the streamwise vortices on the flow characteristics are documented in detail and quantified by comparing the 2-D and 3-D vorticity thickness variations of the shear layers.

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