Design of Wake Equalizing Ducts using RANSE-based SBDO

Furcas, Francesco; Vernengo, Giuliano; Villa, Diego; Gaggero, Stefano

doi:10.1016/j.apor.2020.102087

Cited by 25 publications

(10 citation statements)

References 23 publications

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“…Experimental and numerical results collected over the years have confirmed these energy-saving actions and the functioning principles of these devices [8]. For fully blocked slow-speed vessels, wake-equalizing ducts were successfully designed [5,9,10], with promising decreases in the delivered power up to 6% based on numerical calculations. In the framework of the EU project GRIP [11][12][13][14], pre-swirl stators reached energy savings of 6%, which in the particular case of a twin-screw passenger vessel with hull shapes and functioning conditions usually not optimal for this type of application, were still close to 4%.…”

Section: Introductionmentioning

confidence: 66%

“…Pre-swirl fins inherit the parameters of the fins, then reduce to 14 the number of design parameters for the optimization process. The wake-equalizing duct is the simplest case, since its geometry is parametrized using only four quantities (diameter, chord, angle of attack and maximum sectional camber) capable of describing only the circular axisymmetric duct and not the complex, non-symmetric, shapes devised in [10,24].…”

Section: Parametric Description Of Esdsmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 66%

Section: Parametric Description Of Esdsmentioning

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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“…Even if the computational time is kept as low as possible by the selection of the most efficient computational setup, high-fidelity RANS solvers do not provide the sufficient efficiency to be applied with success in an optimization design process. To overcome this issue, accurately trained surrogate models, as already proposed in [46][47][48][49][50], can substitute the high-fidelity solver to make the process applicable also at an industrial, time constrained, level. In current analyses, a Gaussian process (GP) based on the ordinary kriging method has been applied as surrogate model.…”

Section: Surrogate Modelmentioning

confidence: 99%

An Effective Mesh Deformation Approach for Hull Shape Design by Optimization

Villa

Furcas

Pralits

et al. 2021

JMSE

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A method for the morphing of surface/volume meshes suitable to be used in hydrodynamic shape optimization is proposed. Built in the OpenFOAM environment, it relies on a Laplace equation that propagates the modifications of the surface boundaries, realized by applying a free-form deformation to a subdivision surface description of the geometry, into the computational volume mesh initially built through a combination of BlockMesh with cfMesh. The feasibility and robustness of this mesh morphing technique, used as a computationally efficient pre-processing tool, is demonstrated in the case of the resistance minimization of the DTC hull. All the hull variations generated within a relatively large design space are efficiently and successfully realized, i.e., without mesh inconsistencies and quality issues, only by deforming the initial mesh of the reference geometry. Coupled with a surrogate model approach, a significant reduction in the calm water resistance, in the extent of 10%, has been achieved in a reasonable computational time.

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“…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%

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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Design of Wake Equalizing Ducts using RANSE-based SBDO

Cited by 25 publications

References 23 publications

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

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

An Effective Mesh Deformation Approach for Hull Shape Design by Optimization

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

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