Session: 06-05-01 Marine Hydrodynamics I

Paper Number: 103432

103432 - Comparison Between Experiments and Simulations for a Ship Maneuvering in Waves 

The current regulations of the International Maritime Organization (IMO) aims to increase the reduction of carbon dioxide (CO₂) emissions from shipping by providing mandates to improve the Energy Efficiency Design Index (EEDI) of new ships. This has prompted newer vessels to be equipped with low-powered engines as compared to the previous vessels of similar size. However, the low power may potentially cause some vessels to be ill-equipped to maneuver effectively in the presence of waves. Although, traditionally turning characteristics of a vessel was considered in calm waters, in light of the new regulations it is important to consider course-changing ability in waves during the design process. This study aims to compare the maneuvering simulations and experiments of a scaled KRISO container ship (KCS) in calm water and in regular waves. The MMG standard method was developed by the Maneuvering Mathematical Group (MMG) which was organized by the Japan Society of Naval Architects and Ocean Engineers. It is used to simulate the motions of the vessel in still water. A potential flow theory-based MDLHydroD software was used for calculating second-order wave drift forces. To determine the accuracy of the simulations, free-running model tests have been conducted in calm water conditions and regular waves. The Simulation results partially agree with the experimental results. The discrepancy occurs because the simulation has considered only the effects of second-order wave forces and does not take into account the effects due to the first-order wave forces and the MMG prediction method has only considered the 3-DOF only and does not consider the roll motion in the equation of motion. In this study, the MMG mathematical models in calm water and in waves are compared and the differences between the experimental and simulation results are highlighted.

Presenting Author: Krishnavelu Ramachandran Indian institute of technology Maras

Presenting Author Biography: I am pursuing a Ph.D degree in the field of ship maneuvering in waves in the department of ocean engineering at the Indian Institute of Technology Madras (IITM) under the guidance of Dr. Abhilash Sharma Somayajula. My research title is "An Experimental and Numerical evaluation of Maneuvering performance of a ship in calm water and in waves". prior to IIT Madras, I worked as an ad-hoc lecturer in the department of civil engineering at the Government College of Engineering (GCE) Tirunelveli, Tamilnadu. I did a master's degree in the department of Hydraulics and water resources engineering at the College of Engineering Guindy (CEG) campus, Anna University and a bachelor's degree in the department of civil engineering at Mohammed Sathak AJ College of Engineering, Chennai. My research interests include Hydrodynamic coefficients, Autonomous surface vessels (ASV), second-order mean wave drift forces, Fluid-structure interaction, etc.

Authors:

Krishnavelu Ramachandran Indian institute of technology Maras
Visharad Borsutkar Indian Institute of Technology Madras
Abhilash Sharma Somayajula Indian Institute of Technology Madras