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首页> 外文期刊>International Journal of Offshore and Polar Engineering >Variation of the Drag Coefficient Investigated by Using Tower-based Long Period Measurements-Condition of High Wind Speed with Following and Cross Swell
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Variation of the Drag Coefficient Investigated by Using Tower-based Long Period Measurements-Condition of High Wind Speed with Following and Cross Swell

机译：基于塔的长期测量研究的阻力系数的变化-高风速随跟随和交叉膨胀的条件

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摘要

The drag coefficient C_D is generally expressed as a function only of the wind speed U_(10). However, there exists considerable disagreement among the observed values of C_D. In this study, we investigate the variation of C_D by using data sets, including directional wave spectral data in long period measurements. Wind and wave data obtained at a coastal tower operated by the Shirahama Oceanographic Observatory of the Disaster Prevention Research Institute (DPRI) at Kyoto University in Japan, together with data sets obtained by Suzuki et al. (2002), were used. The directional wave spectra were separated into four different groups: the following and cross swell cases, mixed swell case, and pure wind-wave case. The data sets also showed variation in wind speed regions higher than 20 m/s in the C_D - U_(10) diagram. It was shown that this variation is the effect of the natural fluctuation of wind. We also observed C_D values by using the windsea Reynolds number R_B proposed by Toba et al. (2006). In the following swell cases, C_D values are slightly smaller. In the cross swell cases, when the difference in direction between the wind and waves is greater than 70 degrees, C_D has larger values. However, C_D has similar values in the following swell cases when the difference in direction between the wind and waves is less than 70 degrees.
机译：阻力系数C_D通常仅表示为风速U_（10）的函数。但是，在C_D的观测值之间存在相当大的分歧。在这项研究中，我们通过使用数据集（包括长期测量中的定向波谱数据）研究C_D的变化。在日本京都大学防灾研究所（DPRI）白滨海洋观测台操纵的沿海塔楼获得的风和波数据，以及Suzuki等人获得的数据集。 （2002）。方向波谱分为四个不同的组：以下和交叉浪潮情况，混合浪潮情况和纯风浪情况。在C_D-U_（10）图中，数据集还显示风速区域中的变化高于20 m / s。结果表明，这种变化是风的自然波动的影响。我们还使用了Toba等人提出的风海雷诺数R_B来观测C_D值。 （2006）。在以下膨胀情况下，C_D值会稍小。在交叉涌浪情况下，当风和波浪之间的方向差异大于70度时，C_D的值较大。但是，当风浪的方向差小于70度时，在以下的起伏情况下C_D具有相似的值。

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