Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

Salvatore, Francesco; Sarichloo, Zohreh; Calcagni, Danilo

doi:10.20944/preprints201804.0048.v1

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Profile lift and drag coefficients, C L , C D and efficiency C L /C D are predicted by the X-Foil code [12]. A high-AoA extrapolation model is applied as described in [8].…”

Section: Application Of the Design Procedure: Laboratory-scale Model ...mentioning

confidence: 99%

“…Hydrodynamics models for three-dimensional (3D) inviscid flows, represent a more physically consistent approach than BEM, whereas computational effort is comparably small, as necessary for recursive calculations in design studies. Lifting Line Method (LLM) and Boundary Integral Equation Method (BIEM) fall within this class and applications to hydrokinetic turbines have been addressed, e.g., in [7] and [8]. Although these models are widely used for marine propellers, a few applications to marine turbine design are reported.…”

mentioning

confidence: 99%

“…The inclusion of full 3D hydrodynamics by BIEM in horizontal-axis turbine design problems is the subject of the present work. The methodology developed in [8] adopts a general inviscid-flow formulation to describe unsteady hydrodynamics under arbitrary inflow conditions. By including trailing vorticity and Viscous-Flow Correction (VFC) models, accurate predictions of turbine performance can be obtained over a wide range of operating conditions, as discussed in [11].…”

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confidence: 99%

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Horizontal-axis tidal turbine design based on 3D hydrodynamics

Sarichloo¹,

Ghorbanpour²,

Salvatore³

2022

Int. J. Mar. Ene.

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A computational procedure for the hydrodynamicanalysis and design of horizontal-axis tidal turbinesis presented and numerical applications are discussed. Themethodology combines an original design algorithm and aturbine hydrodynamics model valid for arbitrary 3D flows.Different from standard design methods based on bladeelement models, 3D-flow corrections are not necessary.Blade geometry parameters are determined with the objectiveto maximize power at given design Tip Speed Ratio(TSR), whereas a constraint is introduced in order to limitturbine thrust at TSR higher than the design condition.Numerical applications include the design of a laboratoryscaleturbine and a full-scale turbine for the exploitationof tidal streams in the Messina strait. Alternative designsolutions obtained by varying the design TSR are comparedin terms of energy output as well as mechanical loadstransferred to the powertrain.

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“…Profile lift and drag coefficients, C L , C D and efficiency C L /C D are predicted by the X-Foil code [12]. A high-AoA extrapolation model is applied as described in [8].…”

Section: Application Of the Design Procedure: Laboratory-scale Model ...mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Horizontal-axis tidal turbine design based on 3D hydrodynamics

Sarichloo¹,

Ghorbanpour²,

Salvatore³

2022

Int. J. Mar. Ene.

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Numerical Simulation of Earthquake Impacts on Marine Structures: A Comprehensive Review

Kabi,

Leon-Medina,

Pozo

2024

Buildings

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Marine and underwater structures, such as seawalls, piers, breakwaters, and pipelines, are particularly susceptible to seismic events. These events can directly damage the structures or destabilize their supporting soil through phenomena like liquefaction. This review examines advanced numerical modeling approaches, including CFD, FEM, DEM, FVM, and BEM, to assess the impacts of earthquakes on these structures. These methods provide cost-effective and reliable simulations, demonstrating strong alignment with experimental and theoretical data. However, challenges persist in areas such as computational efficiency and algorithmic limitations. Key findings highlight the ability of these models to accurately simulate primary forces during seismic events and secondary effects, such as wave-induced loads. Nonetheless, discrepancies remain, particularly in capturing energy dissipation processes in existing models. Future advancements in computational capabilities and techniques, such as high-resolution DNS for wave–structure interactions and improved near-field seismoacoustic modeling show potential for enhancing simulation accuracy. Furthermore, integrating laboratory and field data into unified frameworks will significantly improve the precision and practicality of these models, offering robust tools for predicting earthquake and wave impacts on marine environments.

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Lagrangian Vortex Computations of a Four Tidal Turbine Array: An Example Based on the NEPTHYD Layout in the Alderney Race

et al. 2021

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This study investigates the wake interaction of four full-scale three-bladed tidal turbines with different ambient turbulence conditions, in straight and yawed flows. A three-dimensional unsteady Lagrangian Vortex Blob software is used for the numerical simulations of the turbines’ wakes. In order to model the ambient turbulence in the Lagrangian Vortex Method formalism, a Synthetic Eddy Method is used. With this method, turbulent structures are added in the computational domain to generate a velocity field which statistically reproduces any ambient turbulence intensity and integral length scale. The influence of the size of the structures and their density (within the study volume) on the wake of a single turbine is studied. Good agreement is obtained between numerical and experimental results for a high turbulence intensity but too many structures can increase the numerical dissipation and reduce the wake extension. Numerical simulations of the four turbine array with the layout initially proposed for the NEPTHYD pilot farm are then presented. Two ambient turbulence intensities encountered in the Alderney Race and two integral length scales are tested with a straight flow. Finally, the wakes obtained for yawed flows with different angles are presented, highlighting turbine interactions.

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Marine Turbine Hydrodynamics by a Boundary Element Method with Viscous Flow Correction

Cited by 7 publications

References 16 publications

Horizontal-axis tidal turbine design based on 3D hydrodynamics

Horizontal-axis tidal turbine design based on 3D hydrodynamics

Numerical Simulation of Earthquake Impacts on Marine Structures: A Comprehensive Review

Lagrangian Vortex Computations of a Four Tidal Turbine Array: An Example Based on the NEPTHYD Layout in the Alderney Race

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