摘要
以湍流标准k－ε模型为基础，综合考虑代数应力模型（ASM）及湍流热流输运方程，建立了热分层流动的热浮力湍流修正数学模型。理论及在液纳空腔内的热分层湍流计算机模拟中的应用表明，该模型在一程度上反映了由于流动过程中温度不均而导致的各向异性特征，并为解决热分层流中温度随时间变化的计算机模拟难题提供了一个较为简单、稳定的模型。
A modified turbulent mathematical model of thermal buoyancy of thermally stratified flow is developed, based on the turbulent standard k-εmodel, the comprehensive consideration of ASM and turbulent heat flux transport equation. The theory and its application in computer-simulated thermally stratified flow in a cavity filled with sodium indicate that, to a certain degree, the model reflects the non-isotropic characteristics due to varying temperature in flow.The model offers a more simple and stable approach designed for the solution to the difficult problem due to temperature＇varying with time in computer-simulated thermally stratified flow.
关键词
热分层
热浮力
湍流模型
各向异性
计算机模拟
thermal stratification, thermal buoyancy, turbulent model, non-isotropic
