Many complex flow phenomena in nature and engineering applications involve turbulence, multiphase flows, and heat/mass transfer processes, such as the generation of typhoons and dust storms, and the diffusion of pollutants. Fully understanding the physical mechanisms behind these phenomena is not only of scientific significance, but also of great application value. This research direction focuses on fundamental topics in the fields of turbulence, multiphase flow, and heat/mass transfer processes, including but not limited to turbulent boundary layer dynamics, turbulent coherent structures, turbulent energy cascade, interactions between turbulence and particles, heat/mass transfer in porous media, and so on. Through original and novel developments in theoretical concepts and models, numerical simulations, experimental techniques and data analysis methods, we aim to solve a number of important issues in these fields. The outcomes of these studies also provide scientific support for the applications of relevant engineering technologies.