本项研究的目的是开展中低浓度悬浮液在复杂流动状态（如剪切流、管流、脉动来流以及重力沉降等）中，微米毫米级颗粒和纤维迁移分布特性与流变机理的数值模拟与实验研究。具体如下，通过实验测量与大规模三维并行格子玻尔兹曼(LBM)模拟探讨各类复杂流动中颗粒和纤维迁移分布统计规律，考虑各种影响因素发展完善颗粒（纤维）相宏观迁移扩散模型。揭示悬浮颗粒、纤维在剪切流动中的迁移分布规律与有效粘性系数及法向应力差等非牛顿行为特征量的关联，探索悬浮液非牛顿特性的内在机制。同时将发展相关实验方法及测量手段；完善LBM 数值模拟方法，提高并行计算效率及LBM模拟复杂流固耦合问题的计算稳定性。相关的研究成果可为生物医药、化工冶金、水利环保等部门提供重要的理论依据。

In this project, suspensions with bulk volume fractions 10%~40% in complex flow conditions, such as shear flow, pipe flow, pulsating flow, and gravity sedimentation etc., will be studied by the lattice Boltzmann simulations and experiments. The migration and distribution of the micron- or millimeter-sized (non-colloidal) particles and fibers in the flows and rheology mechanism will be investigated. Specifically, the statistical characteristics of the migration and distribution of particles and fibers in different flows will be explored. The factors that contribute to distribution characteristics will be revealed and the macro diffusion models for the particle (fiber) phase will be developed. The correlation between the distribution characteristics and the effective viscosity coefficient, normal stress differences will be discussed so as to explore the inherent mechanism for the non-Newtonian behaviour of the suspension. In the meanwhile, the relevant experimental apparatus would be established and measurement approaches would be developed. The LBM will be improved in terms of the efficiency of parallel computing and numerical stability for such a complex fluid-structure interaction. The related research results can provide important theoretical basis for biomedical, chemical metallurgy, water conservancy and environmental protection departments.