CFD Investigation into Seakeeping Performance of a Training Ship

Fitriadhy, Ahmad; Dewa, Syarifuddin; Mansor, Nurul Aqilah; Adam, Nur Amira; Yee, Ng Cheng; Siang, Kang Hooi

doi:10.37934/cfdl.13.1.1932

Cited by 4 publications

(3 citation statements)

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“…( 1)-( 4) . The CFD flow solver on Flow3D is based on the incompressible unsteady RANSE in which the solver applies the volume of fluid (VOF) to solve a free surface model [25][26][27].…”

Section: Conservation Equationsmentioning

confidence: 99%

Optimization Modelling of a Catamaran Hull Form towards Reducing Ship’s Total Resistance

Fitriadhy

Rizat

Razak

et al. 2022

CFDL

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Due to the increasing of fuel prices and volatile of environmental regulations, it is a challenge for Naval Architects to design a ship dealing with an optimum ship’s total resistance. The conventional design of catamaran hull has not satisfied yet to reduce the ship’s total resistance. This paper presents a numerical investigation into gaining sufficient reduction of the ship’s total resistance of catamaran through optimizing her hull form. To achieve this research objectives, a numerical optimization modelling coupled with a Computational Fluid Dynamics (CFD) approach has been successfully conducted. Several parameters such as length, beam and draft of catamaran hull have been taken into account towards reducing the ship’s total resistance. Here, the simulation constraints are applied to obtain the optimum dimension, where the length, beam and draft of the catamaran hull were optimized within the range of 1.2 m to 1.5 m, 0.11 m to 0.14 m and 0.07 m to 0.08 m, respectively. In general, the optimization simulation revealed that the optimum dimension of the catamaran hull resulted in reduction of the total ship’s resistance. The results showed that the optimum length, beam and draft of hull led to reduce by 21.08%, 16.95% and 17.91%, respectively. Merely, this numerical optimization simulation provides a useful way for reducing the total ship’s resistance of the catamaran at the preliminary design stage.

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“…( 1)-( 4) . The CFD flow solver on Flow3D is based on the incompressible unsteady RANSE in which the solver applies the volume of fluid (VOF) to solve a free surface model [25][26][27].…”

Section: Conservation Equationsmentioning

confidence: 99%

Optimization Modelling of a Catamaran Hull Form towards Reducing Ship’s Total Resistance

Fitriadhy

Rizat

Razak

et al. 2022

CFDL

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“…By referring to Zhou [12], the hydrodynamic equations are derived based on Computational Fluid Dynamics (CFD) simulation to determine the hydrodynamic properties of the underwater glider used in the dynamic simulation [25,27]. The coefficients obtained from CFD simulations are 1 , 1, 2 , 0 , and .…”

Section: Hydrodynamic Equationsmentioning

confidence: 99%

A New Roll and Pitch Control Mechanism for an Underwater Glider

Panjavarnam¹,

Ovinis²,

Karupanan³

2021

ARFMTS

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In this paper, a new roll and pitch control mechanism for an underwater glider is described. The mechanism controls the glider’s pitch and roll without the use of a conventional buoyancy engine or movable mass. The mechanism uses water as trim mass, with a high flow rate water pump to shift water from water bladders located at the front, rear, left, and right of the glider. By shifting water from the left water bladder to the right water bladder, a roll moment is induced. Similarly, pitch is achieved by controlling the water flow between the front and rear water bladder using a water pump. The water bladders act not only as a means for roll and pitch control but as a buoyancy engine as well. While this mechanism reduces the need for a dedicated buoyancy engine, as well as internal moving masses, motion control is more complicated, as buoyancy, roll, and pitch must be considered simultaneously. The dynamics of the system were derived and simulated, as well as validated experimentally. The glider is able to move in a sawtooth pattern with a pitch angle of 43.5?, as well as a maximum roll angle of 43.6?. Additionally, the effect of pump rate on pitch and roll rate was investigated. Both pitch and roll rates increase with increasing pump rate.

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“…Lin and Lin [10] evaluated the seakeeping performance at various sailing speeds of small highspeed vessels. Furthermore, Fitriadhy et al [11] employed CFD to evaluate the seakeeping performance of small naval vessels. However, CFD can incur high computational costs if a large number of calculations are required owing to various frequency and wave-direction conditions; thus, it is a somewhat inefficient method.…”

Section: Introductionmentioning

confidence: 99%

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

Nam

Park

et al. 2022

Water

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This study proposes a computational fluid dynamics (CFD)-modified potential (CMP) model. This hybrid model uses linear potential theory with a corrected damping ratio obtained from CFD simulations to analyze the seakeeping performance of a small vessel. According to the analysis procedure of the proposed model, a motion analysis, including the prediction of the roll and pitch damping ratio of a small barge, was conducted; to verify reliability; the results were compared to those of an experiment performed in a physical tank. The relative errors in the experiment for peak amplitude in the roll motion response amplitude operators (RAOs) using the CMP model were relatively small, whereas those obtained from only the potential analysis were large errors in all three conventionally used roll-damping ratios. In addition, the computational time consumed by the CMP model was longer than that consumed by the potential theory but faster than the full CFD simulation for all wave conditions. Subsequently, based on the motion analysis results, the seakeeping performance was evaluated in a real sea environment, and the results on the single significant amplitude (SSA) were discussed through comparison with the results of the potential analysis and experiment.

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CFD Investigation into Seakeeping Performance of a Training Ship

Cited by 4 publications

References 0 publications

Optimization Modelling of a Catamaran Hull Form towards Reducing Ship’s Total Resistance

Optimization Modelling of a Catamaran Hull Form towards Reducing Ship’s Total Resistance

A New Roll and Pitch Control Mechanism for an Underwater Glider

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

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