九州大学 エネルギー基盤技術国際教育研究センター

Renewable Energy Development Division – Yuji SUGIHARA –

Ocean Renewable Energy Technology

Professor

Yuji SUGIHARA

Specialization

Environmental Fluid Dynamics, Hydraulic Engineering

Affiliation

Faculty of Engineering Sciences

Research Topics

  • Momentum and CO2 Transfers at the Air-Sea Interface
  • Turbulence-based Description of Gas Transfer at the Water Surface and Its Applications to Hydraulic Engineering
  • Heat and Mass Transfers in Urban Atmosphere

Research Outline

Accurate estimates of CO2 exchange flux across the air-sea interface are very important for predicting the climate change due to global warming. Advanced laboratory and field studies are carried out to develop atmosphere-ocean-wave coupled models describing air-sea momentum and CO2 transfers. Also, direct numerical simulation (DNS) is made to reveal the physical mechanism of gas transfer at the water surface from viewpoints of turbulence dynamics.

Digital image processing of whitecap coverage on the ocean surface

Digital image processing of whitecap coverage on the ocean surface

The determination of whitecap coverage is made by means of a digital image processing. Whitecap coverage becomes an important parameter to quantify air-sea momentum and CO2 fluxes.

Direct numerical simulation of gas transfer at the water surface

Direct numerical simulation of gas transfer at the water surface

Spatial distributions of horizontal velocity and gas absorption flux on the water surface are numerically simulated by using a direct numerical simulation (DNS).