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格子Boltzmann方法中三维运动边界的统一模型 被引量:1

Unified Method for Three-dimensional Moving Boundary in Lattice Boltzmann Method
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摘要 格子Boltzmann方法(LBM)中边界条件的处理很复杂,在现有的边界条件处理方法中,动力学格式能够精确满足宏观边界条件,但由于要解一个不定方程,必须引入附加假设确保方程非奇异.作为动力学格式和反弹格式的一种扩展,提出一种处理三维任意速度运动边界的统一模型,其中入口速度和固体壁面速度是该模型的特殊情形.给出用于三维15速度的表达式.为了检验该模型,模拟对角顶盖驱动三维空腔流,并将结果与有限差分法计算的结果进行比较,说明所提出的统一模型是合理可行的. A unified method is proposed to treat 3D moving boundaries at arbitrary velocity as an extension of kinetic format and bounce-back format. Velocities at inlet and on solid wall are special cases of the model. A simplified expression is given in a three dimensional 15-velocity model. Numerical simulation for a diagonally lid-driven three-dimensional cavity flow is performed to verify this scheme. Compared with finite difference method (FDM), the proposed method proves reasonable.
机构地区 浙江大学力学系
出处 《计算物理》 EI CSCD 北大核心 2008年第5期535-542,共8页 Chinese Journal of Computational Physics
基金 国家自然科学基金重点项目(No.10632070)资助项目
关键词 格子BOLTZMANN方法 三维运动边界条件 运动学格式 顶盖驱动三维空腔流 lattice Boltzmann method three-dimensional moving boundary condition kinetic format three-dimensional diagonal lid-driven cavity flow
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