Computational fluid dynamics analysis of cylindrical floating breakwater towards reduction of sediment transport

Fitriadhy, Ahmad; Faiz, M.A.; Abdullah, S.F.

doi:10.15282/jmes.11.4.2017.10.0276

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…In the selection of the turbulent model, the authors employ the SST k-ω (SST for shear-stress transport) model, which is able to improve the prediction of flows with strong adverse pressure gradients and separation. The set-up of the turbulent model was similar to the previous paper presented by Fitriadhy et al, [12], which is then expressed in Eq. ( 1) and Eq.…”

Section: Turbulent Modelmentioning

confidence: 99%

“…Therefore, for high-speed crafts, it is necessary to control the trim [11]. Following the previous works of Fitriadhy et al, [12][13][14][15], the growing technologies of computers with high reliability and precision of codes for computational simulation, Computational Fluid Dynamic (CFD) approach has become attractive tool to investigate hydrodynamic lift force of the high-speed craft incorporated with the trim-tabs allowing to capture a fully hydrodynamic interaction surrounding the ship's hull. Apart the specific results, the computational is relatively, less time-consuming and even practical with flexibility parameter variations for various computational configurations.…”

Section: Introductionmentioning

confidence: 99%

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Computational Investigation of Pitch Motion of a High-Speed Craft Incorporated with Trim-Tabs

Fitriadhy

Pheng²,

Adzkh³

et al. 2022

CFDL

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An excessive trim by stern on a high-speed craft is vulnerable to decrease comfortable ride incorporated with the large pitch motion. To prevent such problem, the craft is then equipped with a device known as “trim-tabs” providing a lift force at the stern region, which leads to reduce pitch angle/trim of the craft. This paper presents computational modelling of trim-tabs on high-speed craft towards reducing the pitch motion in the calm water condition. Here, the commercial Computational Fluid Dynamic (CFD) software; called Numeca Fine Marine has been accordingly utilised to evaluate several effects of Froude numbers (Fr) and angle of the trim-tabs into characteristics of the lift force of the high-speed craft. The results revealed that the pitch motion of the high-speed craft equipped with the trim-tabs (5o) has significantly reduced up to 76% at Fr = 1.0. This can be explained that the installed trim-tabs has increased the negative trim moment, which inherently creates the restoring moment pushing the stern up along the pitch-axis. Meanwhile, this may cause involuntary the total ship’s resistance increased. In general, this simulation pointed out the advantage of the trim-tabs to increase the comfortability of the high-speed craft.

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Section: Turbulent Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Investigation of Pitch Motion of a High-Speed Craft Incorporated with Trim-Tabs

Fitriadhy

Pheng²,

Adzkh³

et al. 2022

CFDL

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show abstract

“…Following the CFD application on the naval architecture fields [18][19][20][21][22][23][24][25], the computational simulations have been extended to predict the lift force and the ship's resistance of the hydrofoil ship in the calm water condition. Several parameters such as the various angles of attacks for the fore and aft foils and the effects of the Froude numbers are taken into the computational simulations.…”

Section: Simulation Conditionmentioning

confidence: 99%

Computational Investigation into Prediction of Lift Force and Resistance of a Hydrofoil Ship

Fitriadhy

Nabila

Grosnin

et al. 2022

CFDL

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The characteristics of the fore and aft foils at the various angles of attack incorporated with forward velocities have been vulnerable to induce strong nonlinearities to dynamic lift force and ship resistance. Then, a computational simulation is necessarily required to predict their performances in the calm water condition. This paper presents a computational investigation of the hydrofoil ship on predicting lift and ship’s resistance using fluid dynamic (CFD) simulation approach. Several parameters such as Froude numbers and the angle of attacks both of fore and aft foils have been accordingly taken into account. The results revealed that the subsequent increase on angle of attack of fore and aft foils was directly proportional to the lift force and the ship’s resistance. In addition, the lift force of the aft and fore foils with the angle of attacks of 10 degrees and 5 degrees, respectively, resulted in the significant increase of the lift force and the ship’s resistance. However, the subsequent increase of Froude number from 1.382 up to 1.626 has insignificant effect to the lift and the ship’s resistance of the hydrofoil. It can be concluded that CFD simulation is very beneficial to ensure an operational effectiveness of hydrofoil design towards prediction on the lift force and the hydrofoil’s resistance at the preliminary design stage.

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“…Floating breakwaters increasingly become an alternative and reliable coastal protection as it is cheaper in production cost as compared to conventional bottom-fixed breakwaters. Floating breakwater system can flexibly oriented on location while adapt with sea level rise and fall that would be a best decision in order to control the sedimentation that threatens the shore due to erosion [1]. Their utilization is further enhanced in circumstances for water circulation and esthetic considerations [2] apart from multiple uses as walkways, docks, marine culture etc.…”

Section: Introductionmentioning

confidence: 99%

Optimized modelling on lateral separation of twin pontoon-net floating breakwater

Fitriadhy¹,

Abdullah²,

Hairil³

et al. 2019

JMES

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Since the attribute of wave energy transmission is susceptible to lateral separation (S/D) between twin pontoons of floating breakwater (TPFB), arbitrarily selection of S/D may present problems in the evaluations on the effectiveness of the structure. This paper presents a numerical optimization modelling aimed at obtaining the optimum S/D through Genetic Algorithm (GA) approach. The artificial intelligence is primarily employed to minimize transmission of wave energy coefficients ( ) whereas maximize energy dissipation coefficient ( ). To achieve such demand, a numerical simulation implementing a MATLAB code as an interface between the Genetic Algorithm and a CFD program is applied. Several parameters for the effects of various wavelengths and ratios of S/D including a set of criteria have been considered in the simulation, where the optimum solution is chosen from various populations. The results demonstrated that the current GA analysis is efficient that can search a global trade-off between and to determine an optimum S/D ratio. For S/D equal to 2.72, minimized to less than 0.3 as compared to existing model ( > 0.5) while maximized to greater than 0.95 resulting to optimum hydrodynamic effects of TPFB. Hence, the optimization algorithm can serve as a useful engineering tool for a conceptual design to determine an optimum S/D for twin pontoon floating breakwater.

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Computational fluid dynamics analysis of cylindrical floating breakwater towards reduction of sediment transport

Cited by 8 publications

References 22 publications

Computational Investigation of Pitch Motion of a High-Speed Craft Incorporated with Trim-Tabs

Computational Investigation of Pitch Motion of a High-Speed Craft Incorporated with Trim-Tabs

Computational Investigation into Prediction of Lift Force and Resistance of a Hydrofoil Ship

Optimized modelling on lateral separation of twin pontoon-net floating breakwater

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