Выходит 4 номеров в год
ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336
Indexed in
VISUALIZATION OF SUPERSONIC-SUBSONIC TURBULENT-FREE SHEAR FLOWS: COMPARISON BETWEEN 2-D AND 3-D COMPUTATIONS
Краткое описание
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.
-
Liou T-M., Hwang P-W., Numerical visualization of vortical structures in a spatially evolving turbulent compressible mixing layer, Journal of Visualization, 2, 2, 1999. Crossref