Variation of Flow Field Around Twin Cylinders with and Without the Outer Perforated Cylinder ? Numerical Study

作     者：Chandrasekaran SRINIVASAN N.MADHAVI 

作者机构：Department of Ocean Engineering Indian Institute of Technology Madras Department of Ocean Engineering IIT Madras 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2016年第30卷第5期

页      面：763-771页

核心收录：

学科分类：081505[工学-港口、海岸及近海工程] 080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 082401[工学-船舶与海洋结构物设计制造] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the Naval Research Board Government of India(Grant No.DNRD/05/4003/NRB/220) 

主　　题：CFD offshore structure perforated cylinder hydrodynamic force water particle kinematics twin cylinders 

摘      要：Presence of the outer perforated cylinder reduces the direct wave impact on the inner cylinder, which has been testified by many researchers. However, the force reduction mechanism, which is complicated due to the wave-porous structure interaction, needs to be addressed in detail. The present study explains the mechanism with the aid of the computational fluid dynamics （CFD） tool STAR CCM＋. This package is chosen for its capabilities to simulate viscous and turbulence effects caused by passage of waves. For the present study, flow fields around the twin cylinders with different orientations are examined with and without the outer perforated cover. Mechanism contributing to the reduction of force on the existing structure is explained in physical terms, and force reduction is quantified. The present study has direct application in the retrofitting application of offshore members.