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Energies
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Dynamic CFD Simulations of Turbine Aerodynamics
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Dynamic CFD Simulations of Turbine Aerodynamics

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A3: Wind, Wave and Tidal Energy".

Deadline for manuscript submissions: closed (20 February 2023) | Viewed by 5027

Special Issue Editors

Dr. Rohit Dhariwal

E-Mail Website
Guest Editor
Center for Institutional Research Computing, Washington State University, Pullman, WA 99164, USA
Interests: turbulence; particles in turbulence; numerical simulation; CFD; high-performance computing
Dr. Shreyas Bidadi

E-Mail Website
Assistant Guest Editor
National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA
Interests: CFD; aeroacoustics; turbulent flows; combustion; multiphase flows; high-order methods

Special Issue Information

Dear Colleagues,

Turbines are key components of several engineering flow devices, such as aircraft engines and wind turbines. Harnessing the flow’s kinetic energy to generate optimal power depends on several factors, including the complex interaction between oncoming fluid and turbine, blade shape and size, and the condition of the blades themselves. In this regard, computational fluid dynamics (CFD) has been a vital tool for predicting turbine aerodynamics. However, as the scale and complexity of turbines grow rapidly, there is increasing demand for developing advanced CFD tools to better predict flow and turbine blade interaction, and to optimize blade design for improved efficiency. This Special Issue will cover novel modeling and numerical techniques for turbine aerodynamics.

Dr. Rohit Dhariwal
Guest Editor

Dr. Shreyas Bidadi
Assistant Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Computational fluid dynamics
  • Large eddy simulation
  • Modeling
  • Unsteady aerodynamics
  • Shape optimization techniques
  • Uncertainty quantification
  • Wind turbine
  • Vertical-axis wind turbine
  • Wind turbine scaled model
  • Detached eddy simulation (DES)
  • Tidal stream turbine
  • Turbine performance
  • Fluid-structure interaction (FSI)

Published Papers (2 papers)

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Research

26 pages, 9580 KiB  
Article
High-Fidelity Modeling and Investigation on Blade Shape and Twist Angle Effects on the Efficiency of Small-Scale Wind Turbines
by Widad Yossri, Samah Ben Ayed and Abdessattar Abdelkefi
Energies 2023, 16(8), 3430; https://doi.org/10.3390/en16083430 - 13 Apr 2023
Viewed by 2743
Abstract
A high-fidelity analysis is carried out in order to evaluate the effects of blade shape, airfoil cross-section. as well as twist angle distribution on the yielded torque and generated power of a horizontal axis Small-Scale Wind Turbine (SSWT). A computational modeling and an [...] Read more.
A high-fidelity analysis is carried out in order to evaluate the effects of blade shape, airfoil cross-section. as well as twist angle distribution on the yielded torque and generated power of a horizontal axis Small-Scale Wind Turbine (SSWT). A computational modeling and an effective design for a small turbine with a blade length of 25 cm subject to a 4 m/s freestream velocity are presented, in which a segregated RANS solver is utilized. Four airfoil profiles are assessed, namely NACA0012, NACA0015, NACA4412, and NACA4415, and two blade shape configurations, rectangular and tapered, are evaluated. The flow around the rotating turbines is investigated along with blade stresses and performance output for each configuration. Subsequently, the impact of various linear and nonlinear twist distributions on SSWT efficiency is also examined. Results show that for the studied operating conditions corresponding to low-speed flows, the rectangular blade configuration outperforms the tapered blade shape from the generated torque and power perspectives, while the tapered shape configuration represents an attractive design choice from the yielded stresses point of view. Additionally, while the nonlinear twist configuration results in the best performance among the configurations studied, an SSWT blade design implementing a linear twist distribution can be highly competitive provided that a good slope is carefully selected. Full article
(This article belongs to the Special Issue Dynamic CFD Simulations of Turbine Aerodynamics)
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19 pages, 8606 KiB  
Article
Two-Dimensional URANS Numerical Investigation of Critical Parameters on a Pitch Oscillating VAWT Airfoil under Dynamic Stall
by Tariq Ullah, Krzysztof Sobczak, Grzegorz Liśkiewicz and Amjid Khan
Energies 2022, 15(15), 5625; https://doi.org/10.3390/en15155625 - 3 Aug 2022
Cited by 2 | Viewed by 1618
Abstract
In this paper, a thorough 2D unsteady computational fluid dynamic analysis was performed on a pitching airfoil to properly comprehend the dynamic stall and aerodynamic forces. The computational software ANSYS Fluent was used to solve the unsteady Reynolds-averaged Navier–Stokes equations. Low Reynolds number [...] Read more.
In this paper, a thorough 2D unsteady computational fluid dynamic analysis was performed on a pitching airfoil to properly comprehend the dynamic stall and aerodynamic forces. The computational software ANSYS Fluent was used to solve the unsteady Reynolds-averaged Navier–Stokes equations. Low Reynolds number flows were modeled using the k-ω shear stress transport turbulence model. Aerodynamic forces, fluid flow structures, and flow separation delay angles were explored as a function of the Reynolds number, reduced frequency, oscillation amplitude, and mean angle of attack. The maximum aerodynamic forces, including lift, drag, and the onset of the dynamic stall, were all influenced by these variables. The critical parameters that influenced the optimum aerodynamic forces and ended up causing dynamic stall delay were oscillation amplitude and mean angle of attack. The stall angle was raised by 9° and 6°, respectively, and a large increment in the lift coefficient was also noted in both cases. Additionally, for the highest Reynolds number, a considerable rise in the maximum lift coefficient of 20% and a 28% drop in drag coefficient were observed, with a 1.5° delay in the stall angle. Furthermore, a significant increase of 33% in the lift force was seen with a rise of 4.5° in the stall angle in the case of reduced frequency. Full article
(This article belongs to the Special Issue Dynamic CFD Simulations of Turbine Aerodynamics)
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