Numerical Study on the Influence of Head Wave on the Hydrodynamic Derivatives of a Container Ship

Evaluation of maneuverability of a ship at the early design stages is necessary for ensuring safety of its voyage. IMO recommends the test speed or approach speed for the maneuvering predictions as 90–100% of the service speed of the vessel. The confined model tests for ship maneuvering assessment are usually conducted at low speeds and the hydrodynamic derivatives obtained from these tests are used in the equation of motion even when vessel operates at much higher speeds. But the hydrodynamic derivatives and consequently the trajectory predicted using these derivatives differ substantially from the actual maneuvering conditions. Hence the dependency of the derivatives on vessel speed needs to be understood properly to get the correct estimate of the vessel trajectory prediction. This paper investigates the effect of vessel speed (Fn) on hydrodynamic characteristics of a container ship. Straightline test and horizontal planar motion mechanism (HPMM) tests are conducted for a container ship model for different speeds in a CFD environment.

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Estimation of hydrodynamic derivatives of a container ship using PMM simulation in OpenFOAM

Ocean Engineering ◽

10.1016/j.oceaneng.2018.06.063 ◽

2018 ◽

Vol 164 ◽

pp. 414-425 ◽

Cited By ~ 4

Author(s):

Hafizul Islam ◽

C. Guedes Soares

Keyword(s):

Container Ship ◽

Hydrodynamic Derivatives ◽

Derivatives Of

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Numerical study of multi-dimensional hyperbolic telegraph equations arising in nuclear material science via an efficient local meshless method

International Journal of Nonlinear Sciences and Numerical Simulation ◽

10.1515/ijnsns-2020-0166 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Imtiaz Ahmad ◽

Aly R. Seadawy ◽

Hijaz Ahmad ◽

Phatiphat Thounthong ◽

Fuzhang Wang

Keyword(s):

Meshless Method ◽

Material Science ◽

Numerical Study ◽

Research Work ◽

Time Integration ◽

Three Dimensional ◽

Nuclear Material ◽

Telegraph Equations ◽

Model Equations ◽

Derivatives Of

Abstract This research work is to study the numerical solution of three-dimensional second-order hyperbolic telegraph equations using an efficient local meshless method based on radial basis function (RBF). The model equations are used in nuclear material science and in the modeling of vibrations of structures. The explicit time integration technique is utilized to semi-discretize the model in the time direction whereas the space derivatives of the model are discretized by the proposed local meshless procedure based on multiquadric RBF. Numerical experiments are performed with the proposed numerical scheme for rectangular and non-rectangular computational domains. The proposed method solutions are converging quickly in comparison with the different existing numerical methods in the recent literature.

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Estimation of Hydrodynamic Derivatives of Submarine Model by Using VPMM Test

Journal of Navigation and Port Research ◽

10.5394/kinpr.2014.38.2.97 ◽

2014 ◽

Vol 38 (2) ◽

pp. 97-103 ◽

Cited By ~ 2

Author(s):

Jin-Woo Jung ◽

Jae-Hun Jeong ◽

In-Gyu Kim ◽

Seung-Keon Lee

Keyword(s):

Hydrodynamic Derivatives ◽

Derivatives Of

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Head Wave Simulation of a KCS Model Using OpenFOAM for the Assessment of Sea-Margin

10.1115/omae2021-63827 ◽

2021 ◽

Author(s):

Hafizul Islam ◽

C. Guedes Soares

Keyword(s):

Head Wave ◽

Container Ship ◽

Added Resistance ◽

Free Condition ◽

Wave Simulation ◽

Calm Water ◽

Sinkage And Trim ◽

Simulation Results ◽

Design Speed ◽

Propulsion Power

Abstract The paper presents calm water and head wave simulation results for a KRISO Container Ship (KCS) model. All simulations have been performed using the open source CFD toolkit, OpenFOAM. Initially, a systematic verification study has been performed using the ITTC guideline to assess the simulation associated uncertainties. After that, a validation study has been performed to assess the accuracy of the results. Next, calm water simulations have been performed with sinkage and trim free condition at varying speeds. Later, head wave simulations have been performed with heave and pitch free motion. Simulations were repeated for varying wave lengths to assess the encountered added resistance by the ship in design speed. The results have been validated against available experimental data. Finally, power predictions have been made for both calm water and head wave cases to assess the required propulsion power. The paper tries to assess the validity of using 25% addition as sea margin over calm water prediction to consider wave encounters.

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