Direct numerical simulation of laboratory experiments in isotropic turbulence
Direct numerical simulation of laboratory experiments in isotropic turbulence
复制标题
各向同性湍流实验室实验的直接数值模拟
DOI：
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发表时间：
1998
期刊：
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通讯作者：
J. Riley
中科院分区：
文献类型：
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作者：
S. D. B. Kops;J. Riley
大规模并行计算机现在足够大，足以支持各向同性湍流实验室实验的准确直接数值模拟(DNSS)，为研究人员提供了作为空间和时间函数的流场的完整描述。模拟的高精度通过它们与基本的实验室实验的一致性和对数值精度的检查来证明。为了模拟实验，必须满足计算出的最大和最小长度尺度的要求。此外，还发展了一种迭代技术，以初始化流动中较大的长度尺度。使用这些方法，数值模拟系统可以准确地模拟各向同性湍流衰减实验，例如伯爵-贝尔特和科尔辛[J.流体力学]的实验。48,273(1971)]。
Massively parallel computers are now large enough to support accurate direct numerical simulations (DNSs) of laboratory experiments on isotropic turbulence, providing researchers with a full description of the flow field as a function of space and time. The high accuracy of the simulations is demonstrated by their agreement with the underlying laboratory experiment and on checks of numerical accuracy. In order to simulate the experiments, requirements for the largest and smallest length scales computed must be met. Furthermore, an iterative technique is developed in order to initialize the larger length scales in the flow. Using these methods, DNS is shown to accurately simulate isotropic turbulence decay experiments such as those of Comte-Bellot and Corrsin [J. Fluid Mech. 48, 273 (1971)].