A recursive filtering technique is developed to improve the computational efficiency of explicit-filter large-eddy simulation in highly parallelized computational environments. In parallel computations on a partitioned domain, unlike in non-recursive explicit filtering in which a number of ghost cell layers for storing neighbor cell values to ensure communication with neighbor partitions is increased rapidly as the stencil of the filter becomes wider, the present recursive filtering requires only a single layer of ghost cell for storing immediate neighbor cell values regardless of the stencil width of the filter. A generalized algorithm for the construction of recursive filters with desired filter widths is developed. The computational efficiency of the proposed recursive filtering technique over the conventional non-recursive broad-band filtering technique in terms of memory spacing and computational time is presented.

为了提高在高度并行的计算环境中显式滤波器大涡流仿真的计算效率，开发了一种递归滤波技术。在分区域上的并行计算中，与非递归显式过滤不同，在非递归显式过滤中，用于存储邻居单元值以确保与邻居分区通信的重影单元层的数量随着过滤器模板的变宽而迅速增加，本递归过滤不管过滤器的模板宽度如何，只需要单层的虚影单元即可存储直接相邻的像元值。开发了用于构造具有所需滤波器宽度的递归滤波器的通用算法。