کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
663253 | 1458191 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Large eddy simulation of stably stratified turbulent open channel flows with low- to high-Prandtl number
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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![عکس صفحه اول مقاله: Large eddy simulation of stably stratified turbulent open channel flows with low- to high-Prandtl number Large eddy simulation of stably stratified turbulent open channel flows with low- to high-Prandtl number](/preview/png/663253.png)
چکیده انگلیسی
Large eddy simulation of thermally stratified turbulent open channel flows with low- to high-Prandtl number is performed. The three-dimensional filtered Navier-Stokes and energy equations under the Boussinesq approximation are numerically solved using a fractional-step method. Dynamic subgrid-scale (SGS) models for the turbulent SGS stress and heat flux are employed to close the governing equations. The objective of this study is to reveal the effects of both the Prandtl number (Pr) and Richardson (RiÏ) number on the characteristics of turbulent flow, heat transfer, and large-scale motions in weakly stratified turbulence. The stably stratified turbulent open channel flows are calculated for Pr from 0.1 up to 100, RiÏ from 0 to 20, and the Reynolds number (ReÏ) 180 based on the wall friction velocity and the channel height. To elucidate the turbulent flow and heat transfer behaviors, some typical quantities, including the mean velocity, temperature and their fluctuations, turbulent heat fluxes, and the structures of the velocity and temperature fluctuations, are analyzed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 48, Issue 10, May 2005, Pages 1883-1897
Journal: International Journal of Heat and Mass Transfer - Volume 48, Issue 10, May 2005, Pages 1883-1897
نویسندگان
Lei Wang, Xi-Yun Lu,