The Preliminary Design of a Screw Propeller by Means of Computational Fluid Dynamics

Vlašić, Deni; Degiuli, Nastia; Farkas, Andrea; Martić, Ivana

doi:10.21278/brod69308

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…For the opposite faces in the −direction, the velocity inlet boundary and pressure outlet boundary conditions were applied. On the other hand, the far field boundaries (bottom, top and side walls) were defined as velocity inlets for the representation of deep water and infinite air conditions, as used by other researchers [44][45][46]. The inlet, outlet, side wall and bottom boundaries were located at a 2.5 distance from the aft perpendicular of the ship, while the top boundary was located at 1.25…”

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

Penalty of hull and propeller fouling on ship self-propulsion performance

Song

Demirel

Atlar

2020

Applied Ocean Research

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Recently, there has been an increasing interest in predicting the effect of biofouling on ship resistance using Computational Fluid Dynamics (CFD). For a better understanding of the impact of biofouling on the fuel consumption and greenhouse gas emissions of ships, studying the effect of biofouling on ship self-propulsion characteristics is required. In this study, an Unsteady Reynolds Averaged Navier-Stokes (URANS) based fullscale ship self-propulsion model was developed to predict the effect of biofouling on the self-propulsion characteristics of the full-scale KRISO container ship (KCS). A roughness function model was employed in the wall-function of the CFD model to represent the barnacles on the hull, rudder and propeller surfaces. A proportional-integral (PI) controller was embedded in the simulation model to find the self-propulsion point. Simulations were conducted in various configurations of the hull and/or propeller fouling. Finally, the effect of biofouling on the self-propulsion characteristics have been investigated.

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Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

Penalty of hull and propeller fouling on ship self-propulsion performance

Song

Demirel

Atlar

2020

Applied Ocean Research

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“…According to the comparison results, the error of hydrodynamic performance coefficients at J=0. 8 Lateral force fluctuations of the propulsion systems with and without PBCF (J=0.8) are illustrated in Fig. 10.…”

Section: Hydrodynamic Performance Coefficientsmentioning

confidence: 99%

Numerical Prediction on Vibration and Noise Reduction Effects of Propeller Boss Cap Fins on a Propulsion System

Sun

et al. 2020

brod

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To investigate the vibration and noise reduction effects of Propeller Boss Cap Fins (PBCF), the Large Eddy Simulation (LES) method has been employed in the noise performance estimation of a propeller-rudder system. The hydrodynamic performance of the propulsion system is predicted after the grid independence analysis, then further compared with the result of cavitation tunnel experiment. The acoustic simulation is performed based on Ffowcs Williams and Hawkings (FW-H) equation. After the observation of the hydrodynamic noise performance changes, the forces of propulsion systems and noise reduction effects of PBCF are analyzed. It's indicated from the research results that PBCF can not only improve the propulsion efficiency, but also reduce the radiation noise intensity significantly. Meanwhile, the lateral force fluctuation of hub cap can be decreased by suppressing the vibration of propeller shaft. In addition, the time-averaged value of the rudder lateral force has been decreased by about 15.5%. It has been well known that the radiation of propulsion noise is directional. Accordingly, it is found that the noise reduction effects due to PBCF are also directional, which is the most noticeable in the axial direction.

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Effect of Propeller Cup on the Reduction of Fuel Consumption in Realistic Weather Conditions

Tadros

Vettor

Ventura

et al. 2022

JMSE

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This paper presents the effect of a propeller cup on the propeller cavitation and the fuel consumption of a bulk carrier in both calm water and different weather conditions towards improving the energy efficiency of the ship and reducing the level of emissions in terms of design and operation. Based on the propeller optimization model, previously developed that couples NavCad and a Matlab code to select the geometry and the operating point of the propeller at the engine operating point with minimum fuel consumption, the optimized propeller performance is evaluated for different percentages of the cup; light, medium and heavy and compared with the performance of the propeller without a cup in both calm water and several sea states. By evaluating the cavitation criteria, it is concluded that increasing the percentage of cupping reduces the occurrence of cavitation based on the Keller and Burrill methods; moreover, the fuel consumption is reduced by up to 5.4% and 6.6% at the propeller with a higher percentage of cup compared with the uncapped propeller in calm water and among the ship route, respectively.

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The Preliminary Design of a Screw Propeller by Means of Computational Fluid Dynamics

Cited by 4 publications

References 11 publications

Penalty of hull and propeller fouling on ship self-propulsion performance

Penalty of hull and propeller fouling on ship self-propulsion performance

Numerical Prediction on Vibration and Noise Reduction Effects of Propeller Boss Cap Fins on a Propulsion System

Effect of Propeller Cup on the Reduction of Fuel Consumption in Realistic Weather Conditions

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