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Wave force coefficients for horizontally submerged rectangular cylinders

机译：水平浸没矩形圆柱体的波浪力系数

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摘要

The results of wave force measurements carried out on a section of horizontally submerged rectangular cylinders, which are used as pontoons in many offshore structures, are reported in this paper. Two rectangular cylinders with aspect (depth-breadth) ratios equal to 1/2 and 3/4 and a square section (aspect ratio = 1.0) cylinder are chosen for this study. Experiments are carried out in a wave tank at a water depth of 2.2 m at low Keulegan-Carpenter (KC) numbers to measure the horizontal and vertical wave forces acting on a 100mm section, located at mid-length of the cylinders. For each cylinder, tests are carried out for two relative depths of submergence of 2.68 and 4.68. Measured wave forces in regular and irregular waves are then used to derive drag (C_D) and inertia coefficients (C_M). The analysis show that at very low KC numbers the inertia coefficients for all cylinders approached the potential flow values for both horizontal and vertical forces. The drag coefficients at low KC numbers exhibited large values and they decreased sharply with increase in KC number. For the square cylinder, where relatively a large KC number is obtained compared to other cylinders, inertia coefficients reached minimum values in the range of KC of about 3-4 and increased thereafter. In this range, C_M values are about 50% or so, smaller than the same at KC close to zero. The results of the experiments reveal that aspect ratio has large influence on hydrodynamic coefficients.
机译：本文报道了在水平淹没的矩形圆柱体的一部分上进行的波浪力测量的结果，这些圆柱体在许多海上结构中被用作浮船。本研究选择两个纵横比（纵横比）分别等于1/2和3/4的矩形圆柱体和一个方形截面（纵横比= 1.0）。在水深2.2 m的波浪罐中以低Keulegan-Carpenter（KC）数进行实验，以测量作用在圆柱体中部的100mm截面上的水平和垂直波浪力。对于每个圆柱体，针对2.68和4.68的两个相对浸没深度进行测试。然后，使用规则波和不规则波中的测得的波力得出推力（C_D）和惯性系数（C_M）。分析表明，在非常低的KC数下，所有气缸的惯性系数都接近水平力和垂直力的潜在流量值。低KC数下的阻力系数显示出较大的值，并且随着KC数的增加而急剧下降。对于方圆柱体，与其他圆柱体相比，KC值相对较大，惯性系数在KC范围约为3-4时达到最小值，此后增加。在此范围内，C_M值约为50％左右，比KC接近零时的值小。实验结果表明，纵横比对流体动力系数影响很大。

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