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Large-eddy Simulation Of Transition To Turbulence In Natural Convection In A Horizontal Annular Cavity

机译:水平环形腔自然对流向湍流过渡的大涡模拟

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Large-eddy simulations (LES) of transition to turbulence in a horizontal annular cavity are performed, using a dynamic sub-grid scale model and second order schemes for time and space discretizations. Solutions for Prandtl number of 0.707 and Rayleigh number up to 7.5 x 105 are obtained. The onset of transition to turbulence and turbulence regimes are pointed out, as well as the dynamic characteristics of the thermal plume transition. The instantaneous and time average behavior of the flows, related to the velocity and temperature fields, are analyzed and compared with numerical and experimental results from other authors. The influence of transitional and turbulent flows on local and mean Nusselt number are also investigated.
机译:使用动态子网格比例模型和用于时空离散化的二阶方案,对水平环形腔中的湍流过渡进行大涡模拟(LES)。获得0.707的Prandtl数和高达7.5×105的瑞利数的解。指出了向湍流和湍流状态过渡的开始,以及热羽流过渡的动力学特征。分析了与速度和温度场有关的流动的瞬时和时间平均行为,并将其与其他作者的数值和实验结果进行了比较。还研究了过渡流动和湍流对局部努塞尔特数和平均努塞尔特数的影响。

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