کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4992291 | 1457258 | 2017 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Large eddy simulation of three-dimensional plane turbulent free jet flow
ترجمه فارسی عنوان
شبیه سازی توربوشارو بزرگ هواپیما سه بعدی جت بدون جارو
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
A detailed study of a three-dimensional spatially developing planar turbulent jet has been carried out by large eddy simulation (LES). The jet Reynolds number is 4000 based on the inlet velocity and jet width. The dynamic Smagorinsky model (DSM) is used to resolve the subgrid scale stress tensor. The transition from laminar to turbulent flow has been numerically identified and discussed in details. The evolution of vortex roll ups, their transportation and final disintegration to smaller vortices have been visualized by the plot of isosurface of Q criterion. The coherent structures in a turbulent planar jet have been well demonstrated. The time series plots of λ2 criterion shows the swirl and shear nature of the evolving vortices and their passage in the downstream. The time averaged velocity at far downstream (xD=10 and 15) shows a self-similarity behavior where the flow has established a fully turbulent nature. The energy spectra are shown to exhibit the â5/3 power law. The proper orthogonal decomposition (POD) shows that 90% of the fluctuating kinetic energy is contained within the first 100 modes. The probability density function on the centerline (yD=15 and zD=2.5) for different xD locations are plotted and the corresponding skewness and kurtosis values are reported for uÌ,vÌ, wÌ and pÌ.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 65, SeptemberâOctober 2017, Pages 423-439
Journal: European Journal of Mechanics - B/Fluids - Volume 65, SeptemberâOctober 2017, Pages 423-439
نویسندگان
Mukul Bisoi, Manab Kumar Das, Subhransu Roy, Devendra Kumar Patel,