| Project/Area Number |
12450181
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
構造工学・地震工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
FUJINO Yozo Graduate School of Engineering,The University of Tokyo, Professor, 大学院・工学系研究科, 教授 (20111560)
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| Co-Investigator(Kenkyū-buntansha) |
NOMURA Takashi Nihon University, College of Science and Technology, Professor, 理工学部, 教授 (50126281)
KIMURA Kichiro Kyushu Institute of Technology, Department of Civil Engineering, Associate Professor, 工学部・建設社会工学科, 助教授 (50242003)
ISHIHARA Takeshi Graduate School of Engineering,The University of Tokyo, Associate Professor, 大学院・工学系研究科, 助教授 (20323511)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2001: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 2000: ¥9,100,000 (Direct Cost: ¥9,100,000)
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| Keywords | wind prediction / complex terrain / wind energy / modified RCM / boundary treatment / wind tunnel test / separation / prediction error / 高速解法 / 数値解析 / 非線形モデル / 境界処理 / 減速 / 風洞 / 乱流モデル / 風速測定 |
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| Research Abstract |
Kyoto Protocol to the United Nations Framework Convention on Climate Change will take effect, and Japan is demanded to considerably reduce the emission of carbon dioxide. Thus the use of wind energy will be important. For the efficient use of wind energy in Japan, wind prediction with high accuracy over steep and complex terrain is necessary.
In the present study, a new local wind prediction model has been developed, which is based on the fundamental equations of fluid dynamics and can accurately predict separated flow field over complex terrain. In order to calculate wind flow over continuous real terrain, a new method for treatment of side boundary was proposed to assure the mass conservation at any cross section. It was found that the overestimation or underestimation of wind speed arising from the conventional method is improved and predicted wind speed by the present method shows good agreement with the wind speed obtained from calculation on whole domain. At an inlet boundary, a domain of same size as the computational domain was added to account for the effect of upwind terrain. For the engineering practice, a modified residual cutting method (Modified RCM) was proposed, which enables the equation to be solved quickly and stably and is as fast more than 20 times as conventional iterative methods. Finally, a large wind tunnel test with the real terrain model was carried out and characteristics of flow field over complex terrain were investigated by the model. It was noticed that the speed-up and speed-down due to convergence of terrain and flow separation was favorably demonstrated and prediction error of the present model was about ten percent. As a result, the present model can be used for the practical wind energy prediction and contributes largely to the wind energy exploitation in Japan.
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