【摘要】 本文应用渐近匹配法导出了计算贴近浅水水底作垂荡运动的矩形柱体的附加质量和阻尼的公式。所得之公式形式简单,计算结果与按边界元法(BEM)计算所得之结果符合良好。本文还对浅水中柱体的附加质量和阻尼的性态进行了讨论。更多还原

【Abstract】 The heave motion of a two-dimensional rectangular cylinder close to the bottom of shallow water is studied in this paper. Formulae for calculating added mass and damping coefficient are derived in a simple form by using the method of matched-asymptotic expansions. The comparison of the results obtained from present theory to that from BEM showes that if the ratio of bottom gap to water depth is smaller than 0.15-0.20 the present results are with fine accuracy. The characteristics of added mass and damping coefficient corresponding to extreme low frequency of motion are also discussed both from the points of view of physical means and asymptotic analysis.更多还原