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

There are many ways that ship designers can do to get the minimum engine power with the desire ship speed. One of the ways is to design the bow shape with the aim of minimizing ship resistance. In this study, the ship resistance of hard-chine monohull with two different bow shapes that conventional and inverted bows are analyzed. CFD (Computational Fluid Dynamics) approach by using Shear Stress Transport (SST) as turbulence model is used. Different ship speed by Froude numbers Fr 0.2 to 0.7 is applied. The simulation results give convincing evidence that the inverted bow produces lower total resistance compared to the conventional one by about 5% reduction

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“…The friction resistance is obtained by taking friction resistance coefficient (CF) from ITTC-1957 correlation line as shown in Eq. (1).…”

Section: Resistance Representationmentioning

confidence: 99%

“…There are many ways that can be done including by optimizing ship hull or choosing different bows. Fitriadhy et al, [1] optimized catamaran hullform to reduce ship total resistance by using CFD technique. Le et al, [2] conducted optimization hullform of container ship by using Neuro-Response Surface Method.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis into the Resistance Estimation of Hard-Chine Monohull using Conventional against Inverted Bows

Nasirudin

Utama

Sutiyo

et al. 2023

CFDL

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A Scoping Review on Simulation-Based Design Optimization in Marine Engineering: Trends, Best Practices, and Gaps

Serani,

Scholcz,

Vanzi

2024

Arch Computat Methods Eng

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This scoping review assesses the current use of simulation-based design optimization (SBDO) in marine engineering, focusing on identifying research trends, methodologies, and application areas. Analyzing 277 studies from Scopus and Web of Science, the review finds that SBDO is predominantly applied to optimizing marine vessel hulls, including both surface and underwater types, and extends to key components like bows, sterns, propellers, and fins. It also covers marine structures and renewable energy systems. A notable trend is the preference for deterministic single-objective optimization methods, indicating potential growth areas in multi-objective and stochastic approaches. The review points out the necessity of integrating more comprehensive multidisciplinary optimization methods to address the complex challenges in marine environments. Despite the extensive application of SBDO in marine engineering, there remains a need for enhancing the methodologies’ efficiency and robustness. This review offers a critical overview of SBDO’s role in marine engineering and highlights opportunities for future research to advance the field.

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Numerical Analysis and Experimental Validation of Trimaran and Pentamaran Resistance at Various Separation Distances

Yuliora,

Utama,

Suastika

2024

CFD Lett.

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Trimaran and pentamaran are multihull types with an odd number of hulls, namely three and five hulls, generally consisting of one center hull and two or four side hulls smaller than the center hull, which can reduce ship resistance. The trimaran and pentamaran have a more complex phenomenon than the monohull, because of the interaction between the main hull and the side hull, which causes interference caused by changes in flow velocity, pressure changes, and wave interactions generated by each hull. The objective of this study is to analyze the resistance of trimaran and pentamaran NPL-4b models with transom-symmetrical hull and separation distances, specifically S/L ratios of 0.2, 0.3, and 0.4. Since a more limited base of experience exists for multihull ships, experimental or numerical modeling techniques are essential for designers. Numeric investigations were conducted using Numeca software, and experiments were performed in a towing tank. Both methods follow ITTC procedures. Furthermore, the numerical analysis with CFD simulation modifies the Navier-Stokes equation using the turbulence model k-ꞷ SST to generate the RANS equation so that unsteady fluid flow problems can be calculated. It can be implemented in predicting resistance in Froude numbers (Fr) 0.2 to 0.6 at the systematic series of trimaran and pentamaran hull shapes at the model scale. The simulation results were compared to experimental data to validate the resistance of the ships. Overall, good resistance was produced by the trimaran and pentamaran in the C configuration at an S/L ratio of 0.4 with a total resistance coefficient CT of 6.60 x 10-3 and 7.37 x 10-3, respectively. The two results are in good agreement, both methods have a discrepancy of 3.70 %. Fluctuations influence the resistance in the wetted surface area (WSA), wave interactions between hulls, ship velocity, and wave propagation in the aft hull.

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

Cited by 4 publications

References 9 publications

CFD Analysis into the Resistance Estimation of Hard-Chine Monohull using Conventional against Inverted Bows

CFD Analysis into the Resistance Estimation of Hard-Chine Monohull using Conventional against Inverted Bows

A Scoping Review on Simulation-Based Design Optimization in Marine Engineering: Trends, Best Practices, and Gaps

Numerical Analysis and Experimental Validation of Trimaran and Pentamaran Resistance at Various Separation Distances

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