海洋内波对小尺度圆柱体作用力的分析与计算  

Numerical Calculation and Analysis about Internal Wave′s Force on Small-Scale Cylinder

作　　者：叶春生[1] 沈国光[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2005年第2期102-108,共7页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(50179024).

摘　　要：针对小尺度物体的内波荷载问题进行分析和计算.采用Morison公式估算结构物的受力,分别计算了浅海潮频(0.08 c/h)以及高频(3～5 c/h)时单色内波对直立圆柱体的荷载,并与表面波浪和海流荷载进行比较.结果表明,潮频内波与高频内波的荷载相当,比海流荷载低1～2个量阶,与表面波浪荷载相比则更小.在内波传播的某些相位,其荷载垂向上具有明显的正负交错分布,从而可以推测内波对海洋结构物的破坏主要来自于剪切作用.Internal wave′s force on small-scale cylinder was calculated and analyzed. Morison formula was used to estimate the force of internal wave imposed on structures, and the load of internal wave was given for the high frequency (3—5 c/h) and tide frequency (0.08 c/h) respectively, and then compared to that of surface wave and ocean current. The results show that force of internal wave for high frequency is equivalent to that for tide frequency,and 1—2 lower in order than that of ocean current, and even much less than that of surface wave. During internal wave′s propagation, there are some phases that vertical distribution of internal wave′s load goes from positive to negative obviously. Consequently, it can be deduced that the demolishment to the ocean structure mainly comes from the shear action of internal waves.

关 键 词：连续分层 内波荷载 Morison公式 圆柱体 

分 类 号：O353.2[理学—流体力学]