The drag reduction of vehicle is the principal challenge to improving fuel saving and decreasing air pollution. Several flow control devices, including gap fairing, cab roof fairing, boat tail, and side skirt were introduced to reduce the aerodynamic drag exerted on vehicles.

Flows over bluff bodies are closely related to aero- or hydro-dynamic forces on structures. In biomimimetic applications, flexible strutures are usually employed and quantitative flow informaion is essential for optimizing structural design.

Indoor air quality, especially in terms of particulate matters (PM), is a critical concern in public health. The effects of flow structures, water vapor, and surface structure inside a test chamber on PM deposition were quantitatively investigated with flow visualization techniques. Mean velocity fields and turbulence intensity were obtained experimentally by a PIV technique for further understanding of the mechanism associated with PM deposition. 

Social anxiety about micro-plastics is spreading as a new environmental threat. In the near future, the plastic problem may become a social disaster, thus, research on continuous monitoring technology is required. We plan to develop an optical-based real-time micro-plastic detection technology.