Implementation of a Simple Model for Linear and Nonlinear Mixing at Unstable Fluid Interfaces in Hydrodynamics Codes.

Ramshaw, J. D.

Technical Information Center Oak Ridge Tennessee

关键词: Hydrodynamics;    Differential equations;    Partial differential equations;    Spatial distribution;    Nuclear explosives;   

RP-ID  :  DE200415006143

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

A simple model was recently described for predicting the time evolution of the width of the mixing layer at an unstable fluid interface. The ordinary differential equations of this model have been heuristically generalized into partial differential equations suitable for implementation in multicomponent hydrodynamics codes. The central ingredient in this generalization is a nun-diffusional expression for the species mass fluxes. These fluxes describe the relative motion of the species, and thereby determine the local mixing rate and spatial distribution of mixed fluid as a function of time. The generalized model has been implemented in a two-dimensional hydrodynamics code. The model equations and implementation procedure are summarized, and comparisons with experimental mixing data are presented.