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均布扰动流场中的随机对流-扩散过程

Stochastic Convection-Diffusion Process With Uniformly Disturbed Velocity Field
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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
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