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Effect of Observation Tower on Wind Flow over the Ocean :First Assessment of the Applicability of Numerical Simulation Using CFD

机译：观测塔对海洋风流的影响：使用CFD进行数值模拟的适用性的初步评估

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摘要

The wind stress is generally expressed using the drag coefficient C_D with the wind speed at a height of 10m above the sea surface,U_(l0). However, there is considerable disagreement in the observed values of C_D. To develop a model of C_D, 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 4.1m-2.2m, 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.
机译：风应力通常用阻力系数C_D表示，风速在海面U_（l0）上方10m处。但是，C_D的观测值存在很大分歧。要开发C_D模型，必须测量风应力，并且需要使用涡旋相关方法来计算风应力，该方法可以测量水平和垂直风分量。由于平台对风流的影响，风应力测量仅限于固定安装。因此，通过排除平台的影响，数值模拟是选择可以高精度测量风应力的安装位置的更好方法。作为第一种方法，我们研究了使用CFD（计算流体动力学）将数值模拟应用于东京大学平冢观测塔周围流动的高精度观测的应用。我们发现，通过数值模拟获得的风速趋于类似于测得的风速值。此外，流量可视化还显示了观测塔对风的影响。结果，从塔顶的中心开始，对于4.1m-2.2m的高度，平冢塔的效果比率范围为5％-10％。因此，数值模拟具有确定高精度观测值在风应力测量中的位置的能力。

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  • 来源
    《海洋理工学会誌》 |2017年第1期|11-19|共9页
  • 作者

    Naoya Suzuki; Takuji Waseda; Takenobu Michioka; Kosuke Tatsumi; Takeshi Takemoto;

  • 作者单位

    Department of Mechanical Engineering, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashiosaka, Osaka, 577-8502 JAPAN;

    Department of Ocean Technology, Policy and Environment, Graduate School of Frontier Science, The University of Tokyo 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8563, JAPAN;

    Department of Mechanical Engineering, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashiosaka, Osaka, 577-8502 JAPAN;

    Department of Mechanical Engineering, Graduate School of Science and Engineering Research, Kindai University 3-4-1 Kowakae, Higashiosaka, Osaka, 577-8502 JAPAN;

    Department of Mechanical Engineering, Graduate School of Science and Engineering Research, Kindai University 3-4-1 Kowakae, Higashiosaka, Osaka, 577-8502 JAPAN;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Wind speed measurement; Flow visualization; Numerical simulation; Computational Fluid Dynamics (CFD); Wind stress;

    机译：风速测量;流程可视化;数值模拟计算流体动力学（CFD）;风应力;

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