摘要
对空间均匀分布随机扰动输运速度场中的对流-扩散随机过程进行了数值仿真。目的在于揭示即使在输运速度场受均匀扰动情况下,其输出的待求函数同样表现出复杂的节点意义下的多尺度特性,即求解节点上,各待求未知分量具有各自的不同尺度分布。传统的网格细分(mesh-refinement)已不再适用。动态自适应小波空间细分(space-.refinement)使各未知分量具有各自独立的小波求解网格,从而有效地节省了计算量。
Numerical simulation for stochastic convection-diffusion process is performed for the purpose of demonstrating the "grid-wise" multi-scale characteristics of the uncertainty outputs even under uniformly disturbed velocity field. In such cases, traditional mesh-refinement is not suitable for use. The proposed dynamically adaptive wavelet method involving space-refinement allows grids for each solution component (random mode) to be refined independently of the rest, thus effectively reduces the computational expense.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第2期253-257,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.50976071)
关键词
随机对流扩散过程
多尺度问题
小波自适应求解
stochastic convection and diffusion process
multi-scale problems
dynamically adaptivewavelet method