CAJ | 학술논문

针对纳米流体多相流动的微观特征,提出一种基于格子Boltzinann的多尺度耦合方法,在速度和悬浮纳米粒子分布变化比较剧烈的区域采用细网格多相模型,在其它区域视纳米流体为均匀混合的单相流体,使用粗网格单相模型.为保证不同尺度区域之间的物理信息(参数)的准确传递,运用质量和动量守恒原理,建立跨区域的边界耦合模型.几个算例表明,该方法既可以反映纳米流体流动的微观特征,又能提高计算效率,与单纯使用多相模型相比,节省大量时间.
침대납미류체다상류동적미관특정,제출일충기우격자Boltzinann적다척도우합방법,재속도화현부납미입자분포변화비교극렬적구역채용세망격다상모형,재기타구역시납미류체위균균혼합적단상류체,사용조망격단상모형.위보증불동척도구역지간적물리신식(삼수)적준학전체,운용질량화동량수항원리,건립과구역적변계우합모형.궤개산례표명,해방법기가이반영납미류체류동적미관특정,우능제고계산효솔,여단순사용다상모형상비,절성대량시간.
A hybrid method is proposed to study microcosmic characteristics of nanofluid mulfiphase flows in a lattice Boltzmann approach. Multicomponent lattice Boltzmann model on fine mesh is used in regions where physical parameters, such as density and velocity change tempestuously, otherwise a single component one on coarse mesh is used. In order to keep continuity of physical information (physical parameters) in overlapping regions, principle of mass and momentum conservation is used. It shows that in the model microcosmic characteristics of nanofluid flow can be obtained. Computational efficiency is improved observably compared with a multicomponent method.