耗散粒子动力学对颗粒沉降问题的研究  

INVESTIGATION ON PARTICLE SEDIMENTATION USING DISSIPA-TIVE PARTICLE DYNAMICS METHODS

作　　者：孔轶华[1] 张楚华[1] 席光[1] 王超[1] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《工程热物理学报》2008年第1期59-61,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.10572113);国家高技术研究发展计划资助项目(No.2007AA05Z203);教育部新世纪优秀人才支持计划资助项目(No.NCET-06-0847)

摘　　要：给出了一种耗散粒子动力学方法模拟流体流动的理论及数值模型,包括控制方程组、边界条件、数值计算方法。使用耗散粒子动力学方法编程计算了颗粒在重力作用下的沉降运动,观察到颗粒的质量和所受重力对颗粒运动轨迹的影响,且颗粒质量越小,所受重力越小,颗粒运动所表现出的随机性越强烈。从而验证了所采用的数学模型、计算方法在流动数值模拟中的可行性及潜在优势。Mathematical and numerical models for the dissipative particle dynamics were introduced, including the governing equations for the motions of fluid particles, boundary conditions and numerical methods. The codes were programmed to simulate the particle sedimentation under the force of gravity. The effects of the particle＇s mass and gravity force on the particle＇s movement trace were revealed. The results show that, the less the mass and gravity force are, the stronger the randomness of particle＇s movement is. The adopted mathematical model and calculation algorithm were validated. This shows the feasibility and potential predominance of simulation of complex fluid flow. the method proposed in the paper for the numerical simulation of complex fluid flow.

关 键 词：介观模型 耗散粒子动力学 颗粒沉降 

分 类 号：O354.2[理学—流体力学]