Parametric analysis of a tidal current turbine using CFD techniques

Thandayutham, Karthikeyan; Ezhilsabareesh, K.; Samad, Abdus; Nithya, V.; Avital, Eldad

doi:10.1201/9781315229256-66

Cited by 7 publications

(8 citation statements)

References 1 publication

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“…where x ≡ r/R. At high TSR >> 1, we can assume that ϕ << 1 rad and a' << 1 (Korakianitis et al, 2015 andKarthikeya et al, 2016), thus…”

Section: Analytical Estimate Of the Additional Power From The Rear Rotormentioning

confidence: 99%

“…One can also show that for an optimal blade, its geometric twist follows θ = θ T /x, where by the BEM model (Korakianitis et al, 2015); (10) and ϕ T = 2 3 TSR opt (11) Substituting Eqs (10) & (11) into Eq (9) and taking C D0 =0 will yield the Betz limit C P,opt =16/27. We shall assume that the front rotor has been optimized and performs as is predicted by Eq (9). Taking C D0 =0.02, -0.032 for the second (viscous) term on the RHS of Eq (9) and thus that term will be neglected.…”

Section: Analytical Estimate Of the Additional Power From The Rear Rotormentioning

confidence: 99%

“…We shall assume that the front rotor has been optimized and performs as is predicted by Eq (9). Taking C D0 =0.02, -0.032 for the second (viscous) term on the RHS of Eq (9) and thus that term will be neglected. On the other hand, the rear rotor blade is placed at the wrong pitch angle towards the flow and it is assumed the all blade has stalled.…”

Section: Analytical Estimate Of the Additional Power From The Rear Rotormentioning

confidence: 99%

“…Recently, Computational Fluid Dynamics (CFD) has been applied to solve the flow field around HAMCT, e.g. using the Large Eddy Simulation to simulate turbulent flow (Bai et al, 2014) and computing the time or phased-averaged turbulent flow using the RANS approach (Karthikeya et al, 2016). Although these methods have the potential to produce accurate results while providing insight into the physics of the flow, their computational cost can be of time-disadvantage for feasibility study of the hydrodynamic gain of a turbine configuration.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrodynamic Assessment of a Dual-Rotor Horizontal Axis Marine Current Turbine

Avital¹,

Ai²,

Nithya³

et al. 2018

IJET

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The hydrodynamic performance of a dual-rotor horizontal axis marine turbine (HAMCT) is investigated for the power gain in operating the rear rotor without blade-pitch control. This kind of turbine can be advantageous for a rectilinear tidal current of reversing directions, where each rotor blade is optimally fixed-pitched towards its upstream velocity. The blade element momentum (BEM) method is coupled with the Park wake model. A generic three-blade turbine is shown to gain up to 20% in the coefficient of power CP as relative to the front rotor CP when operating the rear rotor at the same tip speed ratio (TSR) as the front one, gaining overall CP up to 0.55. Analytic model is derived to backup the estimate of power gain. Plots for turbine performance variation with TSR and profile hydrodynamic efficiency are given, and analysed for lab and small-medium size turbines.

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“…where x ≡ r/R. At high TSR >> 1, we can assume that ϕ << 1 rad and a' << 1 (Korakianitis et al, 2015 andKarthikeya et al, 2016), thus…”

Section: Analytical Estimate Of the Additional Power From The Rear Rotormentioning

confidence: 99%

Section: Analytical Estimate Of the Additional Power From The Rear Rotormentioning

confidence: 99%

Section: Analytical Estimate Of the Additional Power From The Rear Rotormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrodynamic Assessment of a Dual-Rotor Horizontal Axis Marine Current Turbine

Avital¹,

Ai²,

Nithya³

et al. 2018

IJET

Self Cite

View full text Add to dashboard Cite

show abstract

“…Computational fluid dynamics is the most convenient method for studying behavior of rotating machinery from hydropower turbines to wind turbines [9][10][11]. This method is also applicable for free-stream hydropower stations.…”

Section: Introductionmentioning

confidence: 99%

Free-stream turbine start-up under load

et al. 2019

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Free-stream turbine is an alternative to classical high-head turbines. On one hand, it produces less power, on the other hand, it requires less ser-vice and construction and might be an eco-friendlier option. We have modelled the start-up of a free-stream turbine, which consists of a wheel and a generator, using CFD methods. Unsteady RANS method with k-ω SST model was employed to describe turbulence. We have used finite-volume solver Ansys FLUENT on unstructured mesh. Moving mesh approach was applied for the wheel rotation. We have based the blade sys-tem design on several simple assumptions. Wheel inertia and generator load were taken into account through simple moment equations. Velocity fields during different moments of time were obtained. We have obtained both momentum and power of the wheel curves over time and reviewed cases with generator presence and absence. Angular velocity curves comparison over time is presented for two cases.

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Time‐adaptive Adomian decomposition‐based numerical scheme for Euler equations

Garcia‐Beristain

Remaki

2022

Numerical Methods Partial

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Time efficiency is one of the more critical concerns in computational fluid dynamics simulations of industrial applications. Extensive research has been conducted to improve the underlying numerical schemes to achieve time process reduction. Within this context, this paper presents a new time discretization method based on the Adomian decomposition technique for Euler equations. The obtained scheme is time-order adaptive; the order is automatically adjusted at each time step and over the space domain, leading to significant processing time reduction. The scheme is formulated in an appropriate recursive formula, and its efficiency is demonstrated through numerical tests by comparison to exact solutions and the popular Runge-Kutta-discontinuous Galerkin method.

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Parametric analysis of a tidal current turbine using CFD techniques

Cited by 7 publications

References 1 publication

Hydrodynamic Assessment of a Dual-Rotor Horizontal Axis Marine Current Turbine

Hydrodynamic Assessment of a Dual-Rotor Horizontal Axis Marine Current Turbine

Free-stream turbine start-up under load

Time‐adaptive Adomian decomposition‐based numerical scheme for Euler equations

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