Lift-to-Drag Ratio of the Application of Hydrofoil With Variation Mounted Position on High-Speed Patrol Vessel

Budiyanto, Muhammad Arif; Prawira, Naufal Yudha; Dwiputra, Haekal

doi:10.37934/cfdl.13.5.19

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Judging from the effectiveness of reducing resistance, Hull vane installation was appraised to be superior compared to Stern Foil. Thus, the findings of this research are consistent with other studies where the installation of Hull vane or the position of the foil after transom produce excellent quality in reducing resistance than Stern foil whose foil position is under the transom [29].…”

Section: Comparison Of Resistance Of Each Ship Modelsupporting

confidence: 91%

“…Based on the study, the results of the CFD simulation that are compatible with the results of towing tank experiments are miniscule mesh sizes with a total cell of the fine is 2.5 M [26]. Moreover, the mesh number is ± 350,000 with a computing time of 24 to 25 hours which is categorized as the best quality and close to the experimental results [29]. In this study, the total cells were 3.4 M while in the Foil area, the mesh used was further refined to capture the flow more accurately (Figure 6).…”

Section: Validation and Verification Of Cfd Simulationsupporting

confidence: 55%

“…The installation of Hull vane on cruise ships with a "U" hull type using a NACA 4012 foil profile with an angle of attack of 0 degrees can limit the resistance at 22.9% [26]. In addition, the Naca 4012 foil with an angle of attack of 0 degrees mounted under the transom named Stern foil was able to reduce the resistance on the Mark VI patrol boat by 26.7% [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study Reduction of Resistance on The Flat Hull Ship of The Semi-Trimaran Model: Hull Vane Vs Stern Foil

Nabawi

Syahril

Primawati

2021

CFDL

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Flat hull ships is appraised for its superiority due to the manufacturing simplicity and lower investment costs, yet the ship has its own weakness for it requires a greater resistance. As a matter of fact, a significant reduction on the resistance can be done with foil installation but it is necessary to study the optimal position of the foil installation. This study is aimed at revealing the effectiveness of the Hull Vane and Stern Foil installation in reducing the resistance experienced by the flat hull ship of the semi-trimaran model. The research was conducted by comparing the resistance experienced by the flat hull ship of the semi-trimaran model without foil, Hull vane and Stern foil installations. In addition, the disclosure of resistance experienced by each ship model was carried out by using CFD simulation. The simulation results revealed that the installation of the Hull vane and Stern foil was able to reduce the resistance experienced by the flat hull ship of the semi-trimaran model. The largest reduction occurred in Froude number 1.1, where the Hull vane installation was able to reduce resistance by 12.44% and on the ship model with Stern foil installation the resistance reduction was 5.25%. Based on the results of this CFD simulation, it can be concluded that the Hull Vane installation is more optimal in reducing resistance on the flat hull ship of the semi-trimaran model.

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Section: Comparison Of Resistance Of Each Ship Modelsupporting

confidence: 91%

Section: Validation and Verification Of Cfd Simulationsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study Reduction of Resistance on The Flat Hull Ship of The Semi-Trimaran Model: Hull Vane Vs Stern Foil

Nabawi

Syahril

Primawati

2021

CFDL

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Numerical investigation of the tip-vortex-induced ventilation formation mechanism for a surface-piercing hydrofoil

Zhi,

Huang,

Qiu

et al. 2023

Physics of Fluids

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Recent experiments have demonstrated that tip vortices can trigger the ventilation formation around a surface-piercing hydrofoil. However, the influence of this ventilation on transient flow structures and vortex evolution remains unresolved. This paper numerically investigates the tip-vortex-induced ventilation formation for a surface-piercing hydrofoil at a stalled yaw angle. The predicted unsteady ventilated cavities with tip vortices and pressure-side spray are in reasonable agreement with experimental observations. The ventilation formation process can be divided into three stages: base ventilation, tip-vortex ventilation, and suction-side ventilation. It is indicated that ventilation has a greater impact on the lift coefficient than the drag coefficient. The lift coefficient increases during the base ventilation and tip-vortex ventilation stages due to the expansion of the low-pressure stalled flow, but decreases in the suction-side ventilation stage because of the gradual replacement of this low-pressure region by an aerated cavity. Tip-leakage and tip-separation vortices initially exist independently at the hydrofoil tip, then expand and merge through air ventilation, ultimately forming a strongly stable tip vortex. Furthermore, ventilation promotes vortex generation, with the major contributors being the vortex stretching and baroclinic torque terms.

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Experimental Investigation of High Speed Cross-Domain Vehicles with Hydrofoil

Shi

Tan

Wang

et al. 2023

JMSE

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Unmanned equipment, such as unmanned underwater vehicles (UUVs) and unmanned surface vehicles (USVs), are widely used in marine science for underwater observation, rescue, military purposes, etc. However, current vehicles are not applicable in complex cross-domain scenarios, because they can only perform well in either surface navigation or underwater diving. This paper deals with the design and fabrication of a cross-domain vehicle (CDV) with four hydrofoils that can both navigate at high speed on the surface, like a USV and dive silently underwater, like a UUV. The CDV’s propulsion is provided by a water jet propeller and its dive is achieved by a vertical propeller. The effect of hydrofoils and the performance of the CDV were tested and characterized in experiments, which showed that the hydrofoils improved the stability and surface sailing speed of the CDV. The maximum speed of the CDV was up to 14 kn, which is the highest of its kind according to current knowledge. This work confirmed the feasibility of high-performance CDVs and provided useful information for further improvements to the design.

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Lift-to-Drag Ratio of the Application of Hydrofoil With Variation Mounted Position on High-Speed Patrol Vessel

Cited by 3 publications

References 22 publications

Study Reduction of Resistance on The Flat Hull Ship of The Semi-Trimaran Model: Hull Vane Vs Stern Foil

Study Reduction of Resistance on The Flat Hull Ship of The Semi-Trimaran Model: Hull Vane Vs Stern Foil

Numerical investigation of the tip-vortex-induced ventilation formation mechanism for a surface-piercing hydrofoil

Experimental Investigation of High Speed Cross-Domain Vehicles with Hydrofoil

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