Meshing Strategi untuk Memprediksi Hambatan Total pada Kapal Planing Hull

Fathuddiin, Abubakar; Samuel, Samuel

doi:10.21776/ub.jrm.2021.012.02.15

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Moreover, the k-epsilon model is suitable for the application with a high Reynold number; in this case, the Reynolds number was 6.8 x 10 6 . Subsequently, k-epsilon is more accurate in modelling the complex flow detachment; thereby, this model would provide precise results to predict the drag coefficient on the car's body [34]. In the simulation, the truck geometry was symmetrical, assuming that both sides had the same flow pattern.…”

Section: Domain and Boundary Conditionsmentioning

confidence: 99%

CFD Simulation of Aerodynamics Truck Using Cylinder as Drag Reduction Device

Ainul Ghurri,

Muhamad Alim,

Made Nara Pradipta Adi

et al. 2023

ARFMTS

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Reducing drag is an excellent approach to improving truck efficiency and saving fuel. The addition of the cylinder could be an alternative for drag reduction devices like the windshield that has a similar function to enhance the truck’s aerodynamic performance. A numerical analysis was performed using Ansys Fluent CFD software to estimate the influence of the cylinder on the truck's drag force. The study was conducted by comparing truck without additional cylinder above the truck’s head, truck with windshield, and truck with cylinder variations, which round, type-I, and type-D cylinders. In the simulation, the analysis was carried out at a velocity of 30 m/s using the k-epsilon turbulence model. A grid independence test was conducted to minimize errors and optimize iteration time. The simulation results showed that using round, I-type, and D-type cylinders as an alternative to the windshield reduced the truck's drag coefficient, with the D-type cylinder achieving the highest reduction in drag coefficient, which is 0.72. Modifications in the design of the drag reduction cylinder can lower fuel consumption indirectly by 6.95 % using a D-type cylinder.

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Section: Domain and Boundary Conditionsmentioning

confidence: 99%

CFD Simulation of Aerodynamics Truck Using Cylinder as Drag Reduction Device

Ainul Ghurri,

Muhamad Alim,

Made Nara Pradipta Adi

et al. 2023

ARFMTS

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“…Penentuan hambatan dengan menggunakan metode CFD yaitu karena lambung katamaran memiliki bentuk lambung yang lebih kompleks dibandingkan dengan lambung monohull. Hasil simulasi CFD dapat diterima dengan rumus empiris menghasilkan error di bawah 5% [3]. Dengan nilai error yang relatif kecil, kesalahan dalam pemilihan mesin dapat diminimalisir.…”

Section: Pendahuluanunclassified

Studi Perancangan Kapal Ferry Ro-Ro Model Katamaran Di Perairan Danau Toba

Samuel

Pardosi²

2022

JRM

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Samosir is an island in North Sumatra which is used as a tourist destination because of the beauty of its lake. Crossing to the island of Samosir requires a ship as sea transportation. Based on data from the Ministry of Transportation, Ajibata Port, the process of crossing vehicles on holidays has been delayed due to a surge in passengers during the high season. The purpose of this research is to design/plan a ship to overcome the accumulation of the number of vehicles in the high season. The method used is the comparison ship method. The number of comparison ships is ten ships of the same type and has met the design criteria as a reference in determining the main size of the new ship. Determination of resistance on this catamaran ferry using the Computational Fluid Dynamics (CFD) method. The way CFD works is using the Navier-Stokes equation to describe the turbulence model with k-ε using multiphase water and air flows. The stability analysis was based on the conditions of the four different compartments following the IMO requirements. The motion analysis was based on the wave height on Lake Toba following the 1987 NORDFORSK rules. The results of the ro-ro ferry design resulted in the main dimensions of the LPP being 49.26 m long, 14.32 m wide, 2.4 m laden, and 4 m high. 9 m, Cb demihull 0.54 and a speed of 11 knots. The resistance value generated using CFD simulation is 68.8 KN. Based on the resistance value, two main engines of 253.3 HP are used.

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“…Previous research has studied mesh independency by using the same ship model [6]. Within those research, mesh independency characteristics are studied using five grid variations consisting of 0.48 M, 0.89 M, 1.44 M, 2.33 M, and 2.99 M, as shown in Figure 6.…”

Section: Validation and Benchmarkmentioning

confidence: 99%

“…This research was then broadly used by researchers worldwide to perform numerical computational verifications. Studies on the mesh density of the Fridsma hull have been reported to ensure accurate results [6]. Recent research on Fridsma hull is concerned with hull modification.…”

Section: Introductionmentioning

confidence: 99%

Stern Flap Application on Planing Hulls to Improve Resistance

Budiarto

Samuel

Wijaya

et al. 2022

IJE

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Drag is one of the main factors in improving fuel efficiency. Various study in regards to improve drag performance of a planing hull amongst them is a stern flap. The main parameters to design a stern flap are span length and angle of stern flap. The stern flap works by changing pressure distribution over the ship's bottom and creating a lift force on the stern transom part. This study aims to analyze the behavior of stern flap in variations of span length and angle of stern flap towards drag performance of Fridsma hull form. Finite Volume Method (FVM) and Reynolds-Averaged Navier -Stokes (RANS) are used to predict the hull resistance during simulations. Results show that shear drag is very sensitive towards the total drag value, proving that shear drag valued at least 60% of the total drag in each planing hull multi-phase characteristics phase. Stern flap with 58% of hull breadth span length installed at 0° is considered the most optimal, reducing 10.2% of total drag, followed by 18% displacement reduction. In conclusion, the stern flap effectively improves the Fridsma hull's total drag and its components on 0.89 < Fr < 1.89.

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Meshing Strategi untuk Memprediksi Hambatan Total pada Kapal Planing Hull

Cited by 4 publications

References 8 publications

CFD Simulation of Aerodynamics Truck Using Cylinder as Drag Reduction Device

CFD Simulation of Aerodynamics Truck Using Cylinder as Drag Reduction Device

Studi Perancangan Kapal Ferry Ro-Ro Model Katamaran Di Perairan Danau Toba

Stern Flap Application on Planing Hulls to Improve Resistance

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