海上風における観測塔の影響―数値シミュレーションの適用性における最初の評価―

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  • 鈴木 直弥
    近畿大学理工学部機械工学科
  • 早稲田 卓爾
    東京大学大学院新領域創成科学研究科海洋技術環境学専攻
  • 道岡 武信
    近畿大学理工学部機械工学科
  • 辰巳 公亮
    近畿大学大学院総合理工学研究科メカニックス系工学専攻
  • 竹本 剛志
    近畿大学大学院総合理工学研究科メカニックス系工学専攻

書誌事項

タイトル別名
  • Effect of Observation Tower on Wind Flow over the Ocean—First Assessment of the Applicability of Numerical Simulation Using CFD—
  • Effect of Observation Tower on Wind Flow over the Ocean : First Assessment of the Applicability of Numerical Simulation Using CFD

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<p>The wind stress is generally expressed using the drag coefficient CD with the wind speed at a height of 10 m above the sea surface, U10. However, there is considerable disagreement in the observed values of CD. To develop a model of CD, measurements of wind stress are necessary, and the wind stress needs to be calculated using the eddy-correlation method, which measures the horizontal and vertical wind components. The wind stress measurement is limited to fixed installations due to the effect of the platform on the wind flow. Therefore, a numerical simulation is a better method to select installation locations where the wind stress can be measured with high precision, by excluding the effect of the platform. As the first approach, we investigated the application of numerical simulations to high-precision observations of flow around the Hiratsuka observation tower of the University of Tokyo using CFD (Computational Fluid Dynamics). We found that the wind velocity obtained by the numerical simulations tended to be similar to the measured wind speed values. In addition, the flow visualization showed the effect of the observation tower on the wind flow. As a result, the ratio of the effect of the Hiratsuka Tower has ranges of 5%–10% for heights of 4.1 m–2.2 m, from the center of the top of the tower. Therefore, numerical simulations have an ability to determinate the position of the high-precision observations in the wind stress measurements.</p>

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