Kyushu University Academic Staff Educational and Research Activities Database
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Yuji Ohya Last modified date:2016.05.16



Graduate School


E-Mail
Homepage
http://www.riam.kyushu-u.ac.jp/
Phone
092-583-7777
Fax
092-583-7779
Academic Degree
Wake interference of a row of normal flat plates arranged side by side in a uniform flow
Field of Specialization
Wind engineering, Fluid dynamics, Atmospheric boundary layer, Wind energy
Outline Activities
Wind engineering section performs experimental and numerical research on problems of fluid dynamics, related to wind environments such as airflow over complex terrain and urban canopy, and to wind forces on buildings and structures, and to wind energy as clean and renewable energy. Current areas of research projects are: 1) Turbulence structure and transport characteristics of the atmospheric boundary layer; 2) Prediction of wind systems over local topographic features; 3) Aerodynamic characteristics and flutter phenomena of bluff bodies; 4) Development of wind energy and new wind turbine system; 5) Development of a hybrid energy generation system using solar heat and wind in a wind-solar tower; 6) Computational fluid dynamics in wind engineering. In order to conduct these researches, various wind engineering facilities consisting of a large boundary-layer wind tunnel, thermally stratified wind tunnel and water tanks are effectively utilized.
Research
Research Interests
  • A hybrid renewable energy system by solar heat and wind in a wind-solar tower
    keyword : solar heat, wind aloft, solar chimney, wind-lens vertical type, co-generation, triple-generation
    2015.01.
  • Development of a multi-rotor system using wind-lens turbines
    keyword : diffuser-augmented wind turbine, multi rotor system, wind energy, wind turbine
    2014.01.
  • Development of a high-density Floating-body Energy farm
    keyword : Wind, Solar, Tidal current, Wave
    2010.10.
  • Development of high efficiency mini water energy system using Water-lens turbine
    keyword : Windlens, Water-lens turbine, Micro/mini water energy, river
    2011.04.
  • Research on the utilization of wind energy
    keyword : Wind-lens turbine, Shrouded wind turbine, Brimmed diffuser
    1999.04Development of high-performance wind turbine with a brimmed-diffuser.
  • Reserch on the Atomospheric Boundary Layer
    keyword : Atomospheric Boundary Layer, Turbulance, Stratified Flow, Wind tunnel experiment, Numerical simulation
    1993.04Resarch on atmospheric boundary layer by using wind tunnel and numerical analyses.
  • Research on the prediction method of wind system
    keyword : Wind pattern, Numerical simulation, Wind tunnel experiment, Atomospheric environment
    1996.04Development of a prediction method for local wind pattern and atmospheric environment.
  • Research on the bluff-body flow and the aerodaynamics of them
    keyword : Aerodynamics characteristics, Flow visualization, Numerical caliculation, Wind tunnel experiment
    1981.04Bluff body flow and aerodynamics.
Current and Past Project
  • Using wind energy due to wind-lens turbines, the electricity will be provided to an electroric station. A couple of elecrtoric cars are provided the electlicity through the station. The operation system of the electroric cars will be established.
  • We will initiate an irrigation project using wind energy in a desert area in the northwestern district in China. For this purpose, we will develop a wind turbine with a compact brimmed diffuser, called wind-lens turbine, which is expected to be suitable to a desert area with good wind condition.
  • Research on the integraded renewable energy including solar, wind , hydrozen, etc.
  • Development of high-performance wind turbine
  • Research on a huge floating body which has wind turbines, solar panels, tidal current turbines and wave energy conversion system.
Academic Activities
Books
1. Y. Ohya, A. Okajima and M. Hayashi, Wake Interference and Vortex Shedding, Encyclopedia of Fluid Mechanics, Vol.8, Gulf Publishing Co., N. P. Cheremisinoff Ed., Wake and interference, pp.323-389, 1989.12.
Reports
1. Offshore Wind Power-Floating Integrated Energy Platform in Corporation eith Fishery.
2. Wind-Lens Turbine and Offshore Floating Energy Farm.
3. Yuji Ohya, Floating energy farm offers windy bounty, NATURE JOBS, 2013.03.
4. Wind Lens Turbine(Development of a Highly Efficient Wind Turbine).
Papers
1. Yuji Ohya, Bluff body flow and vortex-its application to wind turbines, Fluid Dynamics Research, 46, 6, 2014.12.
2. Yuji Ohya, Takanori Uchida, Tomoyuki Nagai, Near Wake of a Horizontal Circular Cylinder in Stably Stratified Flows, Open Journal of Fluid Dynamics, 3, 4, 2013.12.
3. Takeo Mizota, Kouhei Kurogi, Yuji Ohya, Atsushi Okajima, Takeshi Naruo, Yoshiyuki Kawamura, The strange flight behaviour of slowly spinning soccer balls, Nature SCIENTIFIC REPORTS, 3, 2013.05.
4. Shuhei Takahashi, Yuta Hata, Ohya Yuji, karasudani takashi, Uchida Takanori, Behavior of the Blade Tip Vortices of a Wind Turbine Equipped with a Brimmed-Diffuser Shroud, Energies2012, 5, pp.5229-5242, 2012.12.
5. Ohya Yuji, Takanori Uchida, Takashi Karasudani, Masaru Hasegawa, Hiroshi Kume, Numerical Studies of Flow around a Wind Turbine Equipped with a Flanged-Diffuser Shroud using an Actuator-Disk Model, Wind Engineering, 36, 4, 2012.08.
6. Yuji Ohya, Takashi Karasudani, A Shrouded Wind Turbine Generaring High Output Power with Wind-lens Technology, Proceedings of Renewable Energy2010, CD-ROM, 2010.07.
7. Yuji Ohya, Takanori Uchida, Near Wake of a Horizontal Circular Cylinder in Stably Stratified Flows, 九州大学応用力学研究所所報, Vol.138, pp.13-22, 2010.03.
8. Yuji Ohya, Takashi Karasudani, A Shrouded Wind Turbine Generaring High Output Power with Wind-lens Technology, Energies, 3, 2010.03.
9. Development of a highly efficient wind turbine and its future.
10. Tomohiro Hara, Yuji Ohya, Takanori Uchida, Ryohji Ohba, Wind-Tunnel and Numerical Simulations of the Coastal Thermal Internal Boundary Layer, Bundary Layer Meteorology, Vol 130, PP.365-381, 2009.02.
11. Yuji Ohya, Takanori Uchida, Laboratory and Numerical Studies of the Atmospheric Stable Boundary Layers, Journal of Wind Engineering and Industrial Aerodynamics, Journal of Wind Engineering & Industrial Aerodynamics 96(2008),pp.2150-2160, 2008.05.
12. Yuji Ohya, Takashi Karasudani, Akira Sakurai, Ken-ichi Abe, Masashiro Inoue, Development of a Shrouded Wind Turbine with a Flanged Diffuser, Journal of Wind Engineering and Industrial Aerodynamics, vol. 96, Issue 6, pp.524-539, 2008.03.
13. Yuji Ohya, Reina Nakamura, Takanori Uchida, Intermittent Bursting of Turbulence in a Stable Boundary Layer with Low-Level Jet, Boundary-Layer Meteorology, vol. 26, No. 3, pp. 349-363, 2008.01.
14. Y. Ohya, T. Karasudani, Development of a Shrouded Wind Turbine Generating High Output Power with the Wind-Lens Technology, Proc. of the RENEWABLE ENERGY 2006(再生可能エネルギー2006国際会議), CD-ROM, 2006.10.
15. Yuji Ohya, Takashi Karasudani,Akira Sakurai, Masahiro Inoue, Development of a High-Performance Wind Turbine Equipped with a Brimmed Diffuser Shroud, Transactions of the Japan Society for Aeronautical and Space Sciences, 49, 163, 2006.05.
16. Yuji Ohya and Takanori Uchida, Laboratory and numerical studies of the convective boundary layer capped by a strong inversion, Boundary-Layer Meteorology, 112, 2, Vol.112, pp.223-240, 2004.08.
17. Yuji Ohya, Drag of circular cylinders in the atmospheric turbulence, Fluid Dynamics Resrearch, 34, 2, 34, pp.135-144, 2004.01.
18. R. Ohba, T. Hara, S. Nakashima, Y. Ohya and T. Uchida, Gas diffusion over an isolated hill under neutral, stable and unstable conditions, Atmospheric Environment, 36, 36-37, Vol.36, pp.5697-5707, 2002.01.
19. Y. Ohya, Wind tunnel study of atmospheric stable boundary layers over a rough surface, Boundary-Layer Meteorology, 98, 1, vol.98, pp.57-82, 2001.01.
Works, Software and Database
1. .
Presentations
1. Yuji Ohya, An efficient wind turbine with wind-lens technology and offshore floationg energy farm, The 2nd Pacific Rim Energy and Sustainability Conference, 2013.08.27.
2. Yuji Ohya, A highly efficient wind and water turbine with windlens technology and an offshore folating renewable energy farm, COME2013, 2013.05.21.
3. Yuji Ohya, Bluff body flow and vortex, IUTAM2013, 2013.03.13.
4. Yuji Ohya, Wind Power Generation and Windlens, 日本-デンマーク Future Green Technology, 2012.12.11.
Other Research Activities
  • 2005.05.
Membership in Academic Society
  • JAPAN ASSOCIATION FOR WIND ENGINEERING
  • THE JAPAN SOCIETY OF FLUID MECHANICS
  • THE JAPAN SOCIETY OF AERONAUTICAL AND SPACE SCIENCES
  • METEOROLOGICAL SOCIETY OF JAPAN
  • JAPAN WIND ENERGY ASSOCIATION
  • JAPANESE SOCIETY OF APPLIED METEOROLOGY AND CLIMATE RESOURCES
Awards
  • DUNHUANG AWARD
  • Experimental Studies of Stable Boundary Layers and Convective Boundary Layers in the Atmosphere
Educational
Other Educational Activities
  • 2008.11.
  • 2004.11.