Scalable Coupled Ocean and Water Turbine Modeling for Assessing Ocean Energy Extraction

Deluca, Stefano; Zanforlin, Stefania; Rocchio, Benedetto; Haley, Patrick J.; Foucart, Corbin; Mirabito, Chris; Lermusiaux, F. J. Pierre

doi:10.1109/oceans.2018.8604646

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…The turbine model has been developed at the University of Pisa. It consists in a DMST MATLAB routine, and uses the BEM theory in order to compute forces acting on blades, and then torque and power output, P. The structure of the DMST routine is detailed in (Deluca et al 2018). The model allows predicting 𝑃 as a function of the input variables, that are: lift and drag coefficients (depending on the blade profile, attack angle and Reynolds), 𝑐, number of blades, 𝑅, AR, freestream speed, TSR.…”

Section: Methodsmentioning

confidence: 99%

“…To date, it is the most commonly used method to design the characteristics of the rotor, as hydrofoil shape, blade chord (𝑐), number of blades (𝐵), and optimal tip speed ratio (TSR), defined as 𝜔𝑅/𝑈 ∞ , where 𝜔 is the turbine angular speed (in rad/s) and 𝑈 ∞ is the free stream velocity. To identify the sites with the greatest potentials and the optimal turbine geometries to maximize the energy production, considering the real characteristics of the marine environment, the flow data coming from the marine code can be used as input for the BEM based model, since less computationally expensive and not requiring grid refinement (Deluca et al 2018). In this paper we describe an easy methodology based on this kind of approach.…”

Section: Introductionmentioning

confidence: 99%

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A Double Multiple Stream Tube (DMST) routine to identify efficient geometries of cross-flow tidal turbines in site assessment analyses

Pucci¹,

Zanforlin²,

Bellafiore³

et al. 2022

MARINE2021

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A routine to predict the performance of cross-flow hydrokinetic turbines, based on the Blade Element Momentum theory, for site assessment purposes is here presented. The routine uses as input the flow data obtained with the open-source marine circulation code SHYFEM. The routine consists in a Double Multiple Stream Tube model making use of 1D flow simplifications for fast analyses. The dynamic stall sub-model and two original sub-models, implemented to include the effects of blade tip losses and the lateral deviation of streamlines approaching the turbine, have been validated versus results of 3D and 2D CFD simulations. As a case study, the tool is applied to an area of the northern Adriatic Sea in order to quickly identify locations with the highest hydrokinetic potential and, at the same time, to find the most efficient turbine aspect ratio and configuration (single or paired turbines) taking into account the bathymetric constraints. The results show that turbines, with short aspect ratio, and paired turbines (with the same overall frontal area of a single rotor) can give the best power outputs thanks to higher flow speeds available at the top of the water column and more favorable Reynolds number and distribution of tip speed ratios along the blade.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Double Multiple Stream Tube (DMST) routine to identify efficient geometries of cross-flow tidal turbines in site assessment analyses

Pucci¹,

Zanforlin²,

Bellafiore³

et al. 2022

MARINE2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The DMST model used in this work has been developed at the University of Pisa [10]. Such a model is based on the Actuator Disc (AD) approach, and uses BEM theory in order to compute forces acting on blades.…”

Section: Methodsmentioning

confidence: 99%

“…1. Generic horizontal plane of the turbine [10] Let's consider a generic horizontal plane of a CFTT of height L as shown in figure 1.…”

Section: Bem Momentum Source Computationmentioning

confidence: 99%

A Double Multiple Stream Tube (DMST) routine for site assessment to select efficient turbine aspect ratios and solidities in real marine environments

et al. 2021

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A MATLAB routine, based on a Double Multiple Stream Tube model, developed to quickly predict the performance of cross-flow hydrokinetic turbine, here is presented. The routine evaluate flow data obtained with the open-source marine circulation code SHYFEM. The tool can establish the best locations to place tidal devices taking into account bathymetric constraints and the hydrokinetic potential. Hence, it can be used to decide the best set of geometrical parameters. The geometrical variables of our analysis are turbine frontal area, aspect ratio and solidity. Several sub-models, validated with 3D and 2D CFD simulations, reproduce phenomena such as dynamic stall, fluid dynamic tips losses and the lateral deviation of streamlines approaching the turbine. As a case study, the tool is applied to an area of the northern Adriatic Sea. After having identified some suitable sites to exploit the energy resource, we have compared behaviours of different turbines. The set of geometrical parameters that gives the best performance in terms of power coefficient can vary considering several locations. Conversely, the power production is always greater for turbine with low aspect ratio (for a fixed solidity and area). Indeed, shorter devices benefit from higher hydrokinetic potentials at the top of the water column.

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A DMST-based tool to establish the best aspect ratio, solidity and rotational speed for tidal turbines in real sea conditions

Pucci

Zanforlin

Bellafiore

et al. 2022

J. Ocean Eng. Mar. Energy

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A Double Multiple Stream Tube (DMST) routine to predict the performance of cross-flow hydrokinetic turbines in real environments is presented, along with a site assessment application to identify the most efficient turbine aspect ratio, solidity and configuration (single, or paired) for a selected area of the Northern Adriatic Sea. The peculiarity of this DMST tool is its 3D character, since it allows to reproduce the vertical distribution of the torque generated by the turbine. To this end, correlations for fluid dynamic phenomena, based on high-fidelity fully CFD simulations, were implemented. The marine circulation code SHYFEM is adopted to obtain velocity profiles for a half lunar cycle period. The sites with the highest mean kinetic power were identified. The DMST routine is equipped with an iterative process able to establish which rotational speed maximizes the power output. Indeed, a spatially non-uniform velocity profile requires to determine the flow velocity more suitable to obtain the rotational speed via Tip Speed Ratio (TSR) definition. To this end, the section of the blades working at optimal TSR varies from top to bottom, until the maximum power is reached. It works as a virtual Maximum Power Point Tracking system able to adapt the turbine operating conditions for the different turbine geometries, and for changes in flow conditions. The results show that for the case study, the performance curve shape influences the optimal TSR blade section: the latter is often located in the upper part of the turbine for the low solidity, whereas, for high solidity turbines, in the bottom half part.

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Scalable Coupled Ocean and Water Turbine Modeling for Assessing Ocean Energy Extraction

Cited by 4 publications

References 27 publications

A Double Multiple Stream Tube (DMST) routine to identify efficient geometries of cross-flow tidal turbines in site assessment analyses

A Double Multiple Stream Tube (DMST) routine to identify efficient geometries of cross-flow tidal turbines in site assessment analyses

A Double Multiple Stream Tube (DMST) routine for site assessment to select efficient turbine aspect ratios and solidities in real marine environments

A DMST-based tool to establish the best aspect ratio, solidity and rotational speed for tidal turbines in real sea conditions

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