Traditional Catamaran Hull Form Configurations that Reduce Total Resistance

Iqbal, Muhammad; Samuel, Samuel

doi:10.14716/ijtech.v8i1.4161

Cited by 18 publications

(12 citation statements)

References 6 publications

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“…The resistance calculation uses Tdyn software which simulates the ship at certain speed travels in calm water and predicts its resistance. The calculation of ship resistance using Tdyn has been carried out by Samuel et al [8] and Iqbal et al [9]. Their CFD results are relatively good with the empirical equation proposed by Jamaluddin [10].…”

Section: Methodsmentioning

confidence: 94%

Influence of hull entrance angle “Perintis 750 DWT”, toward ship resistance: the case study for design development “Perintis 750 DWT.”

Hadi

Manik

Iqbal

2018

MATEC Web of Conferences

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Geographically Indonesia which most of its territory consists of the sea, causing the necessity of strengthening maritime facilities and infrastructure to conduct activities of distribution of goods and sea transportation facilities, especially ships as a vehicle of sea transportation to maintain inter-island connectivity. Indonesian government builds national connectivity (sea tolls) by the development of pioneer ship design “Kapal Perintis.”. In this study, the vessel Perintis 750 DWT is still lacking in the EEDI (Energy Efficiency Design Index) aspect as required by IMO, so it is necessary to modify the hull part of the vessel to reduce the resistance. The modified hull is carried out by varying the angle of entrance bow of the ship ± 12° in step of 3°. Modifications were made using Delftship software, Computational Fluid Dynamic, called TDyn and verified by towing tank test at Indonesian Hydrodynamics Laboratory (IHL) Surabaya. Every change of the angle of entrance bow in 3 degrees, the ship's resistance will change more and less 3.5%. The smaller angle of entrance bow of the vessel the smaller ship's resistance.

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Section: Methodsmentioning

confidence: 94%

Influence of hull entrance angle “Perintis 750 DWT”, toward ship resistance: the case study for design development “Perintis 750 DWT.”

Hadi

Manik

Iqbal

2018

MATEC Web of Conferences

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“…In this research discusses the potential use of the that renewable energy sources which are implemented in the catamaran prototype with specifications length of arc 170 cm, beam 100 cm and depth 32 cm. Catamaran ship is a twin-hull ship [28], where the two hulls are connected with substantial deck construction and stretch on it to withstand large bending moments and shear forces and work towards the midline (Centerline) ship [29], [30]. The catamaran model uses a battery to supply energy to the DC motor.…”

Section: Introductionmentioning

confidence: 99%

Hybrid renewable energy photovoltaic and darrieus VAWT as propulsion fuel of prototype catamaran ship

2021

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Currently, marine transportation in the world still uses fossil fuels. In addition to running low on supplies, fossil fuels also cause emissions that cause global warming. Sea transportation generates around 1,000 million tonnes of CO2 emissions. Therefore, the exploration of alternative energy is becoming a popular research direction. Several renewable energy sources include solar and wind energy. Indonesia has an average wind speed of above 8 m/s at sea. Also, the energy potential of the sun is around 4.8 kWh/m2. Based on the potential of these renewable energy sources, this study discusses the potential of renewable energy sources from sunlight and wind, which are implemented in the prototype catamaran ship. The results obtained from the experiment, the total energy of photovoltaic (PV) and wind turbine generators is 774 Wh. This energy can be used to charge a battery with a battery specification of 35Ah for 6 hours.

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“…A potentialflow method was carried out to determine the lift force of single-deadrise hulls and catamaran configurations in which hydrodynamics pressure was more pronounced between two catamaran hulls (Bari and Matveev, 2017). Iqbal and Samuel, (2017) have conducted research catamaran hull form show that the fluid form that surrounds the ship hull influences ship resistance. Mittendorf and Papanikolaou (2020) investigated catamaran resistance and also found an increase in total resistance due to viscous interference.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation into the Pressure and Flow Velocity Distributions of a Slender-Body Catamaran Due to Viscous Interference Effects

Utama¹,

Aryawan²,

Nasirudin³

et al. 2021

IJTech

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A computational fluid dynamics investigation was carried out on a slender body catamaran to determine the effect of pressure and flow velocity changes for varied hull separations. The investigation was conducted using an NPL 4a model with a slenderness (length to breadth) ratio of about 11 together with the use of a commercial code (CFX) with hull separations of S/L = 0.3 and 0.4 along with a variation in Reynolds numbers of 2.86×105, 3.43×105, 4.01×105, and 4.44×105. Pressure and flow velocity around the hull were measured to obtain a fluid effect attributed to the influence of catamaran hull interference. A computational fluid dynamics investigation was carried out with the same configurations as those in the experimental tests. The overall results were in good agreement, with the order of discrepancy at about 1.76%; the computational fluid dynamics results were consistently lower than the experimental ones. Both tests demonstrated a viscous interaction between the hulls and, thus, the form factors for the demihull and catamaran were properly derived: the form factor for the demihull (1+k) was 1.254 and for the catamaran (1+βk) was 1.420, indicating interaction effects of about 13.2%. The form factor for the catamaran was consistently higher than the demihull, suggesting some viscous interference between the hulls. The effect of catamaran hull interference variation can be recognized through the velocity augmentation ratio (σ), pressure change ratio (ϕ), and the viscous interference factor (β). In addition, the β value is very helpful for finding out the interference of the hull on a catamaran when sophisticated experimental and numerical tools are not available.

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Traditional Catamaran Hull Form Configurations that Reduce Total Resistance

Cited by 18 publications

References 6 publications

Influence of hull entrance angle “Perintis 750 DWT”, toward ship resistance: the case study for design development “Perintis 750 DWT.”

Influence of hull entrance angle “Perintis 750 DWT”, toward ship resistance: the case study for design development “Perintis 750 DWT.”

Hybrid renewable energy photovoltaic and darrieus VAWT as propulsion fuel of prototype catamaran ship

Numerical Investigation into the Pressure and Flow Velocity Distributions of a Slender-Body Catamaran Due to Viscous Interference Effects

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