拉格朗日下颗粒相数值计算关键问题研究  

Study on Key Points of Particle Phase Value Calculation Based on Lagrange Method

作　　者：李德波[1] 徐齐胜[1] 樊建人[2] 岑可法[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]浙江大学热能工程研究所能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《广东电力》2013年第10期19-23,27,共6页Guangdong Electric Power

基　　金：国家自然科学基金重点项目(50736006)

摘　　要：对气固两相流数值模拟中的离散相数值计算方法在商业软件(Ansys Fluent 14.0)和直接数值模拟中的差异性进行了对比研究,对离散相数值算法具体实现方法进行了分析。分析结果认为:商业软件中的数值模拟结果很难再现实际工程问题中颗粒的湍流扩散现象,软件需要完善;而直接数值模拟可合理地再现实际流动的规律。商业软件中颗粒相求解采用的是随机轨道模型,数值模拟得到的颗粒运动轨迹与颗粒真实运动轨迹有很大的差异;而直接数值模拟得到的颗粒运动轨迹是真实的。商业软件的求解技术是目前工程界一种折中的方案,将来直接数值模拟可能成为工程界一种重要的模拟手段。This paper compares and studies differences of application of dispersed phase numerical calculation algorlmm tot gas-solid two-phase flow numerical simulation in commercial software Ansys Fluent 14. 0 and direct numerical simulation. It analyzes specified realization method of dispersed phase numerical calculation algorithm and gets results which indicate that numerical simulation result in commercial software is hard to reappear turbulent diffusion of particles in practical engineering and the software is needed to be complete while direct numerical simulation is able to reasonably reappear laws of practical flow. Stochastic tracking method is used for particle phase solution and movement trail of particles gained from numerical simulation is greatly different from true movement trail while movement trail gained from direct numerical simulation is true. Solution technology of commercial software is a kind of compromise proposal for present engineering practice while in the future, direct numerical simulation is likely to be an important simulation method.

关 键 词：气固两相 商业软件 湍流扩散 直接数值模拟 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程] O359[理学—流体力学]