This thesis focuses on the orientational and rotational dynamics of ellipsoidal particles in complex flows. By using theoretical analysis and direct numerical simulations, the angular dynamics of ellipsoids in a linear shear flow and turbulent channel flow are further investigated, which advances the understanding of the interaction between fluid and particles in turbulence.

Dr. Zhiwen Cui received his B.S. degree in engineering mechanics in 2017 from Hebei University of Technology, and his Ph.D. degree in fluid mechanics in 2022 from Tsinghua University. After that, he worked as a postdoctoral research fellow at Tsinghua University from 2022 to 2024. He has been an associate professor at Hunan University since November 2024. He works in the fields of turbulence and dispersed multiphase flow by high-fidelity numerical simulations.