کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9690596 | 1457335 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The evolution of freely-decaying, isotropic, two-dimensional turbulence
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The evolution of freely-decaying, isotropic, two-dimensional turbulence The evolution of freely-decaying, isotropic, two-dimensional turbulence](/preview/png/9690596.png)
چکیده انگلیسی
Periodic boundary conditions impose mirror image long-range correlations of velocity and vorticity. Lilly [J. Fluid Mech. 45 (2) (1971) 395-415], and Davidson [Turbulence: An Introduction for Scientists and Engineers, Oxford University Press, 2004], note that these correlations have the potential to influence the dynamical behavior of the turbulence. Varying the energy-containing length-scale of the turbulence relative to the size of the periodic domain allows this effect to be investigated. To this end, we introduce the box-ratio, ldomain/lturbulence, as a measure of the number of energy containing eddies in our simulations. Over a wide range of box-ratios we show that l grows approximately as t1/2, the enstrophy decays as â¼tâ1 (at least for large Re), and the l-normalised vorticity correlations more or less collapse onto a single, self-similar curve. We provide one possible explanation for the observed t1/2 growth of l.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 24, Issue 3, MayâJune 2005, Pages 314-327
Journal: European Journal of Mechanics - B/Fluids - Volume 24, Issue 3, MayâJune 2005, Pages 314-327
نویسندگان
A.J. Lowe, P.A. Davidson,