热球在re =10,000时近尾迹的大涡模拟

Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI:10.1615/tsfp8.1780

M. Stadler, S. Sarkar

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引用次数: 0

摘要

大涡模拟用于数值模拟Re=10,000时加热球体的流动。在空间和时间上精确的二阶半隐式有限差分编码中，用浸入式边界表示球面在笛卡尔域内。提供了涡度场和温度场的可视化，以及尾迹中不同位置的温度场和速度场的剖面图。层流分离的剪切层可以有效地将温度从热球表面传递到尾迹中的冷流体。形成明显的开尔文-亥姆霍兹诱导辊，使分离的剪切层不稳定，促进混合。尾迹尺寸的计算表明，在再循环后的发达区域，速度场和温度场的尾迹尺寸相差10%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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LARGE EDDY SIMULATION OF THE NEAR WAKE OF A HEATED SPHERE AT RE=10,000

Large eddy simulation is used to numerically simulate flow past a heated sphere at Re=10,000. A second order accurate in space and time, semi-implicit finite difference code is used with the immersed boundary to represent the sphere in a Cartesian domain. Visualizations of the vorticity field and temperature field are provided together with profiles of the temperature and velocity fields at various locations in the wake. The laminar separated shear layer was found to efficiently transport temperature from the hot sphere surface to the cold fluid in the wake. Pronounced Kelvin-Helmholtz induced rollers are formed which destabilize the separated shear layer and promote mixing. Calculations of the wake dimensions showed that the wake dimensions of the velocity field and the temperature field differ by 10% in the developed region behind the re-circulating region.

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Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena

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