Eddy diffusivity, eddy noise and subgrid-scale modelling
Eddy diffusivity, eddy noise and subgrid-scale modelling
复制标题
涡流扩散率、涡流噪声和亚网格尺度建模
DOI：
10.1017/s0022112077002316
复制
发表时间：
1977
影响因子：
3.7
通讯作者：
H. Rose
中科院分区：
文献类型：
--
作者：
H. Rose
给出了被动标量在随机规定的冻结速度场作用下的亚格子模型。除了涡旋扩散系数外，它还有一个描述来自次网格尺度的噪声注入的术语，以及一个隐含地描述大涡和略低于有限差分网格分辨率极限的涡旋之间的耦合的术语。模型的建立基于迭代过程，该迭代过程首先模拟出耗散范围的涡旋，然后模拟出尺寸稍大的涡旋，等等。
A subgrid model is presented for a passive scalar advected by a randomly prescribed frozen velocity field. In addition to an eddy diffusivity it has a term which describes the injection of noise from the subgrid scales, and a term which implicitly describes the coupling between the large eddies and the eddies just below the limit of resolution of the finite-difference grid. The construction of the model is based upon an iterative procedure which models away first the dissipation-range eddies and then the eddies of a slightly larger size, etc.