Pre-swirl stators design using a coupled BEM-RANSE approach

Furcas, Francesco; Gaggero, Stefano

doi:10.1016/j.oceaneng.2021.108579

Cited by 11 publications

(8 citation statements)

References 22 publications

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“…The PSS can differ in number of fins, position and inclined angle. Optimization and design approach to the PSS is presented by Furcas and Gaggero [12] using the genetic algorithm and simpler fluid model, while the most promising designs are further investigated with the full CFD approach. Maximum savings achieved from simulations results are near 8%.…”

Section: Overview Of Energy Saving Devicesmentioning

confidence: 99%

Hydro-structural issues in the design of energy saving devices for ships

Bakica,

Vladimir,

Senjanović

2023

Rad Hrvatske akademije znanosti i umjetnosti

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The shipping sector is currently under growing pressure concerning the GHGs emission restriction prescribed by the International Maritime Organization (IMO). Improving the efficiency of the fleet has always been an attractive subject to the shipowners, but with the new regulations, the reduction in fossil fuel consumption has switched from optional economic benefit to a rule. One of the ways for the ship to comply with the new regulations is by installing or retrofitting Energy Saving Devices (ESDs). The ESDs exploit the axial and rotational energy losses inevitably produced by the propeller operation. The ESDs differ in shape, position and kind of energy to be recovered. This article gives an overview of the current trends and practices in the field of the ESDs, along with their classification and type of operation. Furthermore, besides the hydrodynamic design, which still holds the primary importance, structural issues are also addressed, since this subject is rarely investigated in the literature. Given the complex flow field of the ESDs influenced by propeller, ship motions, wake field and waves, applicability of numerical models is described in detail, whereby the state-of-the-art approaches are clearly highlighted. Overall, the ESDs are expected to further mature in the future given the rigid rules, the promising potential of efficiency improvements they offer and the lowcost of installation.

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Section: Overview Of Energy Saving Devicesmentioning

confidence: 99%

Hydro-structural issues in the design of energy saving devices for ships

Bakica,

Vladimir,

Senjanović

2023

Rad Hrvatske akademije znanosti i umjetnosti

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“…self-induced velocities at any propeller rps guess) and not accounting for the unsteady and spatial non-uniform nature of the interaction, considered instead in more advanced body force methods (Gaggero et al 2017). This approximation, successfully exploited for fully-blocked ships (Furcas and Gaggero 2021;Gaggero et al 2018;Villa et al 2019) makes the optimization computationally feasible.…”

Section: Coupled Bem/ranse For Simplified Self-propulsion Estimationsmentioning

confidence: 99%

“…Differences, in any case, are similar to those observed for Ship-1 and easily ascribable to the substantial simplifications accepted to realize a computationally efficient process. As extensively discussed in Furcas and Gaggero (2021), some discrepancies can be ascribed to differently computed propeller performances using the BEM especially in highly non-uniform wakes (Gaggero et al , 2019, to a different interaction of the actuator disk/fully resolved propeller with the hull and to different ways of calculating the effective wake. For the ) computed using fully RANSE analyses latter, in particular, it is worth to note that while the coupled BEM/RANSE method computes the effective wake as the average of the local velocity field resulting from Eq.…”

Section: Test Casesmentioning

confidence: 99%

“…Moreover, full-scale analyses are mandatory since Reynolds effects can substantially change the flow field and the resulting optimal configuration of the device. Simulationbased design optimization methods, as those already applied for propeller or other ESDs designs (Gaggero 2020;Furcas et al 2020) represent a solid approach to deal with these needs, and successful results in the case of Pre-Swirl Stator fins have been already achieved using these approaches even if in the more usual case of fully-blocked and slow ships (Furcas and Gaggero 2021). SBDO, indeed, allows for systematic explorations of enlarged design spaces using the appropriate solvers (RANSE and/or coupled BEM/RANSE) mandatory for the characterization of the pre-swirl functioning.…”

Section: Introductionmentioning

confidence: 99%

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Pre-swirl fins design for improved propulsive performances: application to fast twin-screw passenger ships

Gaggero

Martinelli

2022

J. Ocean Eng. Mar. Energy

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Pre-swirl fins-based energy saving devices (ESDs) have been designed to improve the propulsive performances of twin-screw ships. To this aim, a combined BEM/RANSE method for efficient self-propulsion prediction is required. The approach is included in a framework for a design by optimization, where systematic variations of the ESD geometry have been used to explore the design space and maximize the energy-saving effect of the device. Surrogate models based on Ordinary Kriging are used too, with the aim of realizing an affordable design workflow for the very preliminary design of such devices. The results show encouraging improvements that reach promising energy-savings up to 3% at the design point and satisfactory savings also in off-design functioning conditions.

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“…In this respect, the current study addresses the design of pre-swirl fins (PSFs), preswirl ducts (PSDs) and wake-equalizing ducts (WEDs) for the reduction in the delivered power of the vessel by using the design method and criteria developed in [18,32]. The SBDO is realized thanks to a combination of RANSE and BEM analyses, respectively, for the prediction of the hull resistance and flow (RANSE) and the characterization of the unsteady propeller functioning in the effective wake altered by the presence of the ESD (BEM).…”

Section: Introductionmentioning

confidence: 99%

Pre-Swirl Ducts, Pre-Swirl Fins and Wake-Equalizing Ducts for the DTC Hull: Design and Scale Effects

Nicorelli,

Villa,

Gaggero

2023

JMSE

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A pre-swirl fin (PSF), pre-swirl duct (PSD) and wake-equalizing duct (WED) energy-saving devices (ESD) are designed for the Duisburg Test Case (DTC). To this aim, a simulation-based design optimization method, combining RANSE analyses (ship resistance) with BEM calculations (unsteady propeller performances) in a simplified optimization process realized through a parametric description of ESD geometries, was employed. Fully resolved RANSE analyses were used to validate the outcomes of this affordable design process, which identifies devices capable of saving energy in the delivered power for this type of challenging test case by up to 2.6%. Comparisons with model-scale calculations, furthermore, permit us to discuss the influence of each appendage in different flowfields (model- and full-scale, as well as under the action of the simplified or the resolved propeller) and the reliability of the full-scale extrapolation methods recently proposed for these types of devices.

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Pre-swirl stators design using a coupled BEM-RANSE approach

Cited by 11 publications

References 22 publications

Hydro-structural issues in the design of energy saving devices for ships

Hydro-structural issues in the design of energy saving devices for ships

Pre-swirl fins design for improved propulsive performances: application to fast twin-screw passenger ships

Pre-Swirl Ducts, Pre-Swirl Fins and Wake-Equalizing Ducts for the DTC Hull: Design and Scale Effects

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