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標題: 二維紊剪流層中大型渦流結構之研究
作者: 簡瑞與
關鍵字: 二維紊;剪流層;渦流;結構
出版社: 國立中興大學工學院;Airiti Press Inc.
Project: 興大工程學報, Volume 2, Page(s) 51-63.
The large-scale vortical structures in the evolutions of a two-dimensional turbulentshear layer is studied numerically. The motion of 192 vortices is followed on a 41 X 41grid using a numerical scheme that similar to the vortex-in-cell algorithm. The numericalscheme uses the direct summation of streamfunction contributed by all vortices on the grid.which is then differentiated to obtain the velocity field. The velocity of vortex is obtainedby bilinear interpolation from the grids that enclosing the vortex. The voriticity field of theflow field is obtained by area weighting scheme. The formation, pairing, and coalescence of large-scale vortex structures predicted bythe current scheme are in good agreement with previous numerical simulation by discretevortex methods and vortex-in-cell methods. As to the turbulence characteristics, the quantities such as mean velocities, vorticities, turbulence intensities, and Reynolds stress, are alsocalculated and compared with previous studies. It is found the self-preseveration characteristics are fairly maintained. The temporal variations of momentum flux during pairing process are also presented to visualize the characteristics of turbulent momentum transportbetween the mean flow and turbulence.

ISSN: 1017-4397
Appears in Collections:第02卷

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