Computational study of transient flow around Darrieus type cross flow water turbines

López, Omar D.; Meneses, D.; Quintero, Brian; Laı́n, Santiago

doi:10.1063/1.4940023

Cited by 27 publications

(30 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, the obtained three-dimensional results are in qualitative agreement with the two-dimensional computations of [1], where the RSM and Transition SST turbulence models provided the closest results to the experimental expected torque coefficient value. However, in the 3D case the predictions of the Transition SST model are above the standard SST while in the 2D computations the contrary happens.…”

Section: Sensitivity Of Results Versus Turbulence Modellingsupporting

confidence: 78%

“…can provide a better performance than two equation turbulence models especially in flows with sudden changes in the strain rate and with high swirl and rotation, which is the case of the simulation of vertical axis turbines. Moreover, the obtained three-dimensional results are in qualitative agreement with the two-dimensional computations of [1], where the RSM and Transition SST turbulence models provided the closest results to the experimental expected torque coefficient value. However, in the 3D case the predictions of the Transition SST model are above the standard SST while in the 2D computations the contrary happens.…”

Section: Sensitivity Of Results Versus Turbulence Modellingsupporting

confidence: 78%

“…In that figure, the water flow progresses from left to right and transition from one image to next correspond to a change of 30° in the airfoil position. When the cycle starts (θ = 0°), the boundary layer in both upper and lower sides of the blade has a noticeable portion of laminar boundary layer (see Figure 15a) very similar to the observations of [1]. In fact, in all the blade positions along the cycle it is possible to observe that there is an area with intermittency values noticeably lower than 1 around the profile.…”

Section: Visualisation Of Flow Structuressupporting

confidence: 68%

“…The software computes such force in a x-y coordinate system; therefore, force coefficients (C x and C y ) are obtained in such a reference system and a coordinate transformation (rotation) must be performed to obtain the force coefficients in the t-n reference system (tangential-normal) in terms of the angular position θ [1]:…”

Section: Analysis Of Influence Of Winglets In Turbine Performancementioning

confidence: 99%

“…Therefore, simplified design and evaluation strategies based on potential methods have had limited success, especially for high turbine solidities [1]. As an alternative to describe the flow around CFWTs, Computational Fluid Dynamics (CFD), a well-established tool in academic and industrial sectors [2][3][4][5][6], started to be used since the beginning of this century, first as simplified two-dimensional models of straight blade Darrieus turbines and, only recently, using full three-dimensional models.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

2018

View full text Add to dashboard Cite

This study deals with the three-dimensional unsteady numerical simulation of the flow around a cross-flow vertical-axis water turbine (CFWT) of the Darrieus type. The influence of turbine design on its hydrodynamic characteristics and performance is investigated by means of a time-accurate Reynolds Averaged Navier Stokes (RANS) commercial solver. The flow unsteadiness is described using a transient rotor-stator model in connection with a sliding interface. A classical Darrieus straight blade turbine, based on the NACA0025 airfoil, has been modified adding winglets (symmetric and asymmetric designs) to the blades' tips with the objective of reducing the strength of the detached trailing vortices. The turbulent features of the flow have been modelled by using different turbulence models (k-ε Renormalization Group, standard Shear Stress Transport, transition Shear Stress Transport and Reynolds Stress Model). As a result, the predicted hydrodynamic performance of the turbine including winglets increases, independently of the employed turbulence model, being the improvement higher when a symmetric winglet design is considered. Moreover, visualization of skin friction lines pattern and their connection with vorticity isosurfaces, illustrating the flow detachment in the three blade configurations, has been carried out. Finally, a short discussion about the intermittency behavior along a turbine revolution is presented.

show abstract

Section: Sensitivity Of Results Versus Turbulence Modellingsupporting

confidence: 78%

Section: Sensitivity Of Results Versus Turbulence Modellingsupporting

confidence: 78%

Section: Visualisation Of Flow Structuressupporting

confidence: 68%

Section: Analysis Of Influence Of Winglets In Turbine Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

2018

View full text Add to dashboard Cite

show abstract

Hydraulic and rotor-dynamic interaction for performance evaluation on a Francis turbine

García

Laı́n

Orrego

et al. 2016

Int J Interact Des Manuf

View full text Add to dashboard Cite

Usability is a fundamental quality characteristic for the success of an interactive system. It is a concept that includes a set of metrics and methods in order to obtain easy-to-learn and easy-to-use systems. Usability Evaluation Methods, UEM, are quite diverse; their application depends on variables such as costs, time availability, and human resources. A large number of UEM can be employed to assess interactive software systems, but questions arise when deciding which method and/or combination of methods gives more (relevant) information. We propose Collaborative Usability Evaluation Methods, CUEM, following the principles defined by the Collaboration Engineering. This paper analyzes a set of CUEM conducted on different interactive software systems. It proposes combinations of CUEM that provide more complete and comprehensive information about the usability of interactive software systems than those evaluation methods conducted independently.

show abstract

A review on computational fluid dynamics modeling and simulation of horizontal axis hydrokinetic turbines

Laı́n

Contreras

López

2019

J Braz. Soc. Mech. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

Hydrokinetic energy conversion devices provide the facility to capture energy from water flow without the need of large dams, impoundments, channels or deviation of the water as in conventional hydroelectric centrals. Hydrokinetic systems are intended to be used in streams, either natural (rivers, estuaries, marine currents) or artificially built channels. This article reviews the advances made over the last 10-15 years regarding the three-dimensional computational fluid dynamics modeling and simulation of this type of turbines. Technical aspects of model design, employed boundary conditions, solution of the governing equations of the water flow through the hydrokinetic turbine and assumptions made during the simulations are thoroughly described. We hope that this review will encourage new computational investigations about hydrokinetic turbines that contribute to their continuous improvement, development and implementation aimed to sustainable use of water resources and addressed to solve the problem of lack of electricity supply in small, isolated populations. Keywords CFD • Hydrokinetic turbine • Simulation • Horizontal axis turbine • Axial flow water turbine List of symbols A Cross-sectional area of the rotor (m 2) A ∞ Water area upstream the turbine (m 2) A d Actuator disk area (m 2) A disk Disk area (m 2) A exit Diffuser exit area (m 2) A w Water area downstream the turbine (m 2) a Axial flow induction factor

show abstract

Computational study of transient flow around Darrieus type cross flow water turbines

Cited by 27 publications

References 27 publications

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

Hydraulic and rotor-dynamic interaction for performance evaluation on a Francis turbine

A review on computational fluid dynamics modeling and simulation of horizontal axis hydrokinetic turbines

Contact Info

Product

Resources

About