Subgrid scale models in large eddy simulation

The current paper presents an overview on the present state of the arts in LES of turbulence, especially with stress on subgrid scale models, which appear fundamental to LES. A new SGS model we have suggested is proved superior to the previous ones when applied in the simulation of turbulence in and over canopy as illustration. LES will become a most promising approach for industry design and environmental prediction at the beginning of the next century while RANS and DNS remain complementary tools in the study of turbulence.

本文概述了湍流大涡模拟（LES）的现状，尤其着重于亚格子尺度模型，该模型对LES似乎至关重要。我们提出的一种新的亚格子尺度模型在用于冠层内及冠层上湍流模拟时（作为示例）被证明优于先前的模型。在下个世纪初，LES将成为工业设计和环境预测最有前途的方法，而雷诺平均纳维 - 斯托克斯（RANS）方法和直接数值模拟（DNS）方法在湍流研究中仍然是互补的工具。