Capturing the development and interactions of wakes in tidal turbine arrays using a coupled BEM-DES model

Gajardo, D. I.; Escauriaza, Cristián; Ingram, David

doi:10.1016/j.oceaneng.2019.03.064

Cited by 25 publications

(14 citation statements)

References 45 publications

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“…The turbine forces were calculated from BEM theory and applied to all nodes located within this volume, and the inlet considered the ambient turbulence by using a random flow generator proposed by Smirnov et al [38], using the measured turbulence intensity in the experiments. For details on the numerical model and coupling between the flow solver and BEM, the reader is referred to the recent work of Gajardo et al [30].…”

Section: Des-bem Modelmentioning

confidence: 99%

“…We also perform numerical simulations of these flows, using the model of Gajardo et al [30] that couples the BEM approach with detached-eddy simulations (DES). DES is a coherent-structureresolving hybrid turbulence model that employs URANS near wall boundaries and LES in the rest of the domain [31].…”

Section: Introductionmentioning

confidence: 99%

“…Gajardo et al [30] used the DES-BEM model to simulate the experiments of Stallard et al [32], for arrays of three-bladed turbines. In all cases, the model showed better agreement with the experimental results, compared to an RANS model employed to simulate the flows with a more detailed description of the rotor and blades.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigation of Wake Interactions of Marine Hydrokinetic Turbines

et al. 2019

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To study the performance and environmental impacts of marine hydrokinetic (MHK) turbine arrays, we carry out an investigation based on laboratory experiments and numerical models able to resolve the dynamics of turbulent wake interactions and their effects on the river bed. We investigate a scaled Sabella D10 mounted on a mobile bed for a single and two aligned turbines, measuring the flow velocity, the rotor angular velocity, and the scour on the sediment bed. Numerical simulations are performed using a detached-eddy simulation (DES) turbulence model coupled with the blade-element momentum (BEM) approach, which can capture the mean flow and resolve the dynamics of turbulent coherent structures in the wakes. The simulations show a good agreement on the velocity statistics obtained experimentally. Power and thrust coefficients for the downstream turbine show an average decrease and a larger variability due to the turbulent intensity produced by the upstream turbine, as compared to the single turbine case. Results of this investigation also provide a framework to assess the predictive capabilities, scope, and applicability of computational models parameterizing the turbines using BEM, for testing different turbine designs and siting strategies within the MHK array.

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Section: Des-bem Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigation of Wake Interactions of Marine Hydrokinetic Turbines

et al. 2019

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“…The choice of this experimental case to validate our model was motivated by the large number of devices it presents, and the available measured data. Furthermore, we have to mention that Gajardo et al [24] validated the DES model coupled with a more complex turbine representation, known as Blade Element Momentum, by replicating the flume experiments of the PerAWaT project carried out by Stallard et al [33].…”

Section: Model Validationmentioning

confidence: 99%

“…To study the effects of varying TEC farm configurations, we perform a systematic study by using high-resolution numerical simulations to represent different arrangements of turbines. To simulate the flow around the devices, we utilize the hybrid Detached-Eddy Simulations (DES) turbulence model [20][21][22][23][24], and the TEC devices are represented by the actuator disk approach [25], where a sink of momentum is incorporated at the area occupied by each turbine. From these simulations, we calculate the momentum sink of farms with different distributions, number of devices, and depths.…”

Section: Introductionmentioning

confidence: 99%

A Formulation of the Thrust Coefficient for Representing Finite-Sized Farms of Tidal Energy Converters

2019

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Tidal energy converter (TEC) arrays in tidal channels generate complex flow phenomena due to interactions with the local environment and among devices. Models with different resolutions are thus employed to study flows past TEC farms, which consider multiple spatial and temporal scales. Simulations over tidal cycles use mesoscale ocean circulation models, incorporating a thrust coefficient to model the momentum sink that represents the effects of the array. In this work, we propose an expression for a thrust coefficient to represent finite-sized farms of TEC turbines at larger scales, C t F a r m , which depends on the spatial organization of the devices. We use a coherent-structure resolving turbulence model coupled with the actuator disk approach to simulate staggered turbine configurations in more detail, varying the separation among devices and the ratios between the channel depths and hub heights. Based on these simulations, we calculate the resultant force for various subsets of devices within the farm, and their corresponding effective thrust coefficient, C t F a r m . We conclude that the thrust coefficient depends solely on the lateral separation of the devices, S y , for farms with only two rows. For farms with more than two rows, the streamwise distance, S x , must be considered as well. With the proposed expression, it is possible to calculate efficiently the effects of finite-sized TEC farms and incorporate a momentum sink into ocean circulation models, without assuming a constant coefficient derived from an infinite farm approximation.

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Impact of cavitation and inflow perturbation on the performance of a horizontal-axis tidal turbine

Capone,

DiFelice,

Salvatore

et al. 2023

J. Ocean Eng. Mar. Energy

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The impact of cavitation and inflow perturbation by an upstream support structure on the performance of a horizontal-axis tidal turbine has been studied by experiments at model scale in a depressurized water channel at CNR-INM. Measurements of turbine generated power and thrust have been carried out at varying channel flow speed, tip-speed ratio, and cavitation number. The visualization of cavitation patterns has been associated with the performance measurements to identify the role played by different cavitation types on turbine behavior. Radiated noise measurement were also performed to assess the impact of cavitation phenomena on turbine induced acoustic signature.

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Capturing the development and interactions of wakes in tidal turbine arrays using a coupled BEM-DES model

Cited by 25 publications

References 45 publications

Experimental and Numerical Investigation of Wake Interactions of Marine Hydrokinetic Turbines

Experimental and Numerical Investigation of Wake Interactions of Marine Hydrokinetic Turbines

A Formulation of the Thrust Coefficient for Representing Finite-Sized Farms of Tidal Energy Converters

Impact of cavitation and inflow perturbation on the performance of a horizontal-axis tidal turbine

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