کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
655526 1457650 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Large eddy simulation of a confined square cavity with natural convection based on compressible flow equations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Large eddy simulation of a confined square cavity with natural convection based on compressible flow equations
چکیده انگلیسی

Large eddy simulation of natural convection in a confined square cavity is described. The use of a complex compressible code with an artificial acoustic stiffness correction method, allows the use of higher time steps for a faster time and statistical convergence. We consider a broadly studied experimental case, consisting of a natural convective flow in a confined square cavity, with vertical walls heated at different rates (active walls), set at Ra = 1.58 × 109. Turbulent boundary layers developing on the active walls and a vertical stable stratification characterize the mean flow. It is shown here that the results of this study match the experimental results reported in literature; for instance, mean velocity results. Although results for rms velocity fluctuations are barely over-predicted, the peak region is properly represented, while the greatest disagreements are found in the turbulent heat flow rate (velocity–temperature correlations). Turbulent structures were identified using different visualization methods and statistical studies. The authors found that the boundary layers on the active walls almost reach the fully turbulent regime, tending toward the laminar regime along the horizontal walls.


► Large eddy simulation of natural convection in a confined square cavity is described.
► Turbulent structures were identified using different visualization methods and statistical studies.
► A very good agreement with the experimental results was obtained.
► An artificial acoustic stiffness correction method for low-Mach number flows was implemented.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 32, Issue 5, October 2011, Pages 876–888
نویسندگان
, , , ,