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

Salvatore, Francesco; Sarichloo, Zohreh; Calcagni, Danilo

doi:10.3390/jmse6020053

Cited by 9 publications

(6 citation statements)

References 19 publications

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“…An extension in 3D is envisioned in the near future. Another very interesting work of Salvatore et al [67], which is very close to our formulation, is also considered. However, their approach with Lagrangian vortex sheets prevents the use of the PSE-LES diffusion model as well as the presented ambient turbulence model, both of these aspects being of major importance in the present study.…”

Section: Discussionmentioning

confidence: 91%

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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Section: Discussionmentioning

confidence: 91%

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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“…The present results show a similar range. On the other hand, a recent study using the boundary element method by Salvatore et al [49] reported that viscous forces significantly affect TST performance characteristics for λ < 3, i.e., when the flow encounters massive flow separation and stall, but does not show significant effects for λ ≥ 5. Mason-Jones et al [8] analyzed the experimentally measured performance characteristics of model (D = 0.5 m) and full-scale (D = 10 m and 30 m) TSTs for which the Re D varied from 3 × 10 4 to 10 7 .…”

Section: Thrust and Power Predictionsmentioning

confidence: 98%

Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism

Salunkhe

Fajri

O'Doherty

et al. 2019

JMSE

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This paper documents the predictive capability of rotating blade-resolved unsteady Reynolds averaged Navier-Stokes (URANS) and Improved Delayed Detached Eddy Simulation (IDDES) computations for tidal stream turbine performance and intermediate wake characteristics. Ansys/Fluent and OpenFOAM simulations are performed using mixed-cell, unstructured grids consisting of up to 11 million cells. The thrust, power and intermediate wake predictions compare reasonably well within 10% of the experimental data. For the wake predictions, OpenFOAM performs better than Ansys/Fluent, and IDDES better than URANS when the resolved turbulence is triggered. The primary limitation of the simulations is under prediction of the wake diffusion towards the turbine axis, which in return is related to the prediction of turbulence in the tip-vortex shear layer. The shear-layer involves anisotropic turbulent structures; thus, hybrid RANS/LES models, such as IDDES, are preferred over URANS. Unfortunately, IDDES fails to accurately predict the resolved turbulence in the near-wake region due to the modeled stress depletion issue.

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“…the resolution of which gives access to a value of the velocity potential on each face j of the mesh. We can then use Bernoulli's relation, a practice widely used in potential codes for good quality performance results outside of the regions of stall (Salvatore et al 2015, Salvatore et al 2018:…”

Section: Towards a Simulation Of The Turbine By Anmentioning

confidence: 99%

Tidal and wind turbine simulation with the simulation code DOROTHY

Bex¹,

Dufour²,

Belkacem³

et al. 2022

Trends in Renewable Energies Offshore

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In the context of diversification toward renewable energies, wind and tidal turbines are set to play an important role. To this end, the simulation code DOROTHY uses the Vortex Particle Method, which offers a good compromise between physical realism and computational times. A possibility has recently been added for the account of ambient turbulence in the surrounding flow, using modules based on the Synthetic Eddy Method (SEM) and its divergence-free adaptation (DFSEM). Two representations are now available for the representation of the turbines: the historical option using boundary integral methods or a lifting line model. Thanks to all these developments, wakes and wake interactions of multiple turbines, with a possibility to account for ambient turbulence is now possible with DOROTHY. Furthermore, with the addition of the lifting line, performances evaluation and possible performance losses in realistic tidal or wind turbine farms conditions can now be treated.

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

Cited by 9 publications

References 19 publications

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

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

Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism

Tidal and wind turbine simulation with the simulation code DOROTHY

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