کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
659330 1458131 2009 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
3D Simulations to investigate initial condition effects on the growth of Rayleigh–Taylor mixing
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
3D Simulations to investigate initial condition effects on the growth of Rayleigh–Taylor mixing
چکیده انگلیسی

The effect of initial conditions on the growth rate of turbulent Rayleigh–Taylor (RT) mixing has been studied using carefully formulated numerical simulations. An implicit large-eddy simulation (ILES) that uses a finite-volume technique was employed to solve the three-dimensional incompressible Euler equations with numerical dissipation. The initial conditions were chosen to test the dependence of the RT growth parameters (αb, αs) on variations in (a) the spectral bandwidth, (b) the spectral shape, and (c) discrete banded spectra. Our findings support the notion that the overall growth of the RT mixing is strongly dependent on initial conditions. Variation in spectral shapes and bandwidths are found to have a complex effect of the late time development of the RT mixing layer, and raise the question of whether we can design RT transition and turbulence based on our choice of initial conditions. In addition, our results provide a useful database for the initialization and development of closures describing RT transition and turbulence.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 52, Issues 17–18, August 2009, Pages 3906–3917
نویسندگان
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