We are doing fundamental research in fluid dynamics. Fluid motions are ubiquitous in many areas ranging from biological to astronomical scale and in many applications including aeronautical engineering, environmental studies and energy technologies of next generation. Thanks to the rapid growth of computational power, numerical simulation of fluid motions has acquired a wide range of applications. There are increasing needs for highly accurate simulation as well as novel methods of obtaining useful knowledge from huge data. In our laboratory, we are studying fluid motions by numerical simulation and theoretical analysis.

(1) Computational fluid dynamics
- Development of numerical methods for direct numerical simulation of flows which include complex geometries and/or moving objects
- Hydrodynamic characteristics of swimming fish school

(2) Statistical properties of turbulence and development of new turbulence models
- Development of new turbulence models using machine learning
- 4D visualization and dynamic geometrical analysis of vortical structures in turbulence

(3) Vortex dynamics and hydrodynamic stability
- Instability, nonlinear dynamics and transition to turbulence of strained vortices
- Mechanism of explosive magnetic reconnection in a collisionless plasma