Captive ship model tests are conducted to determine the hydrodynamic derivatives appearing in the maneuvering equations of motions of a ship. These hydrodynamic derivatives have an important role in maneuvering prediction of a ship at early design stages. Practically, surface ships operate at different speed conditions. Variation in vessel speed will affect the hydrodynamic derivatives and subsequently maneuvering characteristics of the ship. This paper investigates the effect of vessel speed on the derivatives and maneuvering characteristics of a ship. Captive model tests are numerically simulated in a CFD environment for a container ship at different Froude numbers to estimate the influence of Froude number on hydrodynamic derivatives and on the turning characteristics of the ship. © 2018 - IOS Press and the authors. All rights reserved.

P. Krishnankutty

Department of Ocean Engineering

T. V. Rameesha

Computational fluid dynamics

Containers

Froude Number

Hydrodynamics

Sailing vessels

SHIP MODELS

CAPTIVE MODEL TEST

CONTAINER SHIPS

Early design stages

HYDRODYNAMIC DERIVATIVES

Numerical investigations

PLANAR MOTION MECHANISMS

SHIP MANEUVERING

Turning circles

Equations of motion

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Numerical investigation on the influence of Froude number on the maneuvering characteristics of a container ship

International Shipbuilding Progress

This paper presents the hydrodynamic effects due to slenderness ratio and aft fins for an underwater axisymmetric body at incidence. The body is torpedo shaped with elliptical nose, tapered tail and cylindrical middle body. The slenderness ratio is varied from 10.8 to 14.4 and flow inclination varied from 0° to 18°. The estimation is done by experimental and numerical means. The axial force, normal force and pitch moment acting on the model was measured during the experiments. Numerical study based on Reynolds Averaged Navier Stokes was carried out using commercial Computational Fluid Dynamics (CFD) code. Sources of experimental and numerical uncertainties were identified and quantified. Pressure measurements and flow visualization were done and compared with CFD flow field predictions. An empirical formulation for estimation of normal force and pitch moment for an axisymmetric body at incidence is suggested based on experimental results. © 2017 Informa UK Limited, trading as Taylor &amp; Francis Group.

Ships and Offshore Structures

Effect of slenderness ratio and aft fins on the hydrodynamic forces for an underwater body in oblique flows

The numerical study of manoeuvrability of surface ships necessitates the determination of the hydrodynamic derivatives in the equations of motion. Standard manoeuvring tests are simulated to evaluate the ship's manoeuvring qualities. This paper deals with the estimation of linear, nonlinear and roll-coupled hydrodynamic derivatives of a container ship by numerically simulating static and dynamic tests at different roll angles using a RANSE solver. The mathematical model suitable for the nonlinear roll-coupled steering model for high-speed container ships is considered here. In order to include the effect of roll on the ship, the roll-dependent derivatives are estimated by using static and dynamic tests numerically performed at discrete heel angles. Standard definitive manoeuvres such as turning circle and zig-zag tests are numerically simulated by solving the equations of motion and the results are verified with those obtained by using experimental values. © 2014 Informa UK Limited, trading as Taylor &amp; Francis Group.

Study of manoeuvrability of container ship by static and dynamic simulations using a RANSE-based solver

Fundamentals of Ship Hydrodynamics

ITTC 1978 Performance Prediction Method

Ocean Engineering

Estimation of the hydrodynamic derivatives by RaNS simulation of planar motion mechanism test

Journal	International Shipbuilding Progress
Publisher	IOS Press
Open Access	No