Vertical-Axis Wind Turbine Aerodynamics with the Space - Time Isogeometric Analysis

2016 ◽  
Vol 2016.29 (0) ◽  
pp. 4_265
Author(s):  
Hiroki Mochizuki ◽  
Kenji Takizawa ◽  
Tayfun E. Tezduyar
Keyword(s):  
Wind Turbine ◽  
Isogeometric Analysis ◽  
Vertical Axis ◽  
Space Time ◽  
Vertical Axis Wind Turbine ◽  
Wind Turbine Aerodynamics

A comprehensive analysis of blade tip for vertical axis wind turbine: Aerodynamics and the tip loss effect

2022 ◽  
Vol 253 ◽  
pp. 115140
Author(s):  
Weipao Miao ◽  
Qingsong Liu ◽  
Zifei Xu ◽  
Minnan Yue ◽  
Chun Li ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Comprehensive Analysis ◽  
Vertical Axis Wind Turbine ◽  
Wind Turbine Aerodynamics ◽  
Blade Tip ◽  
Loss Effect

scholarly journals Space–Time Variational Multiscale Isogeometric Analysis of a tsunami-shelter vertical-axis wind turbine

2020 ◽  
Vol 66 (6) ◽  
pp. 1443-1460 ◽  
Author(s):  
Yuto Otoguro ◽  
Hiroki Mochizuki ◽  
Kenji Takizawa ◽  
Tayfun E. Tezduyar
Keyword(s):  
Unsteady Flow ◽  
Wind Turbine ◽  
Mesh Generation ◽  
Isogeometric Analysis ◽  
Flow Analysis ◽  
Vertical Axis ◽  
Moving Mesh ◽  
Vertical Axis Wind Turbine ◽  
Accurate Representation ◽  
Variational Multiscale

AbstractWe present computational flow analysis of a vertical-axis wind turbine (VAWT) that has been proposed to also serve as a tsunami shelter. In addition to the three-blade rotor, the turbine has four support columns at the periphery. The columns support the turbine rotor and the shelter. Computational challenges encountered in flow analysis of wind turbines in general include accurate representation of the turbine geometry, multiscale unsteady flow, and moving-boundary flow associated with the rotor motion. The tsunami-shelter VAWT, because of its rather high geometric complexity, poses the additional challenge of reaching high accuracy in turbine-geometry representation and flow solution when the geometry is so complex. We address the challenges with a space–time (ST) computational method that integrates three special ST methods around the core, ST Variational Multiscale (ST-VMS) method, and mesh generation and improvement methods. The three special methods are the ST Slip Interface (ST-SI) method, ST Isogeometric Analysis (ST-IGA), and the ST/NURBS Mesh Update Method (STNMUM). The ST-discretization feature of the integrated method provides higher-order accuracy compared to standard discretization methods. The VMS feature addresses the computational challenges associated with the multiscale nature of the unsteady flow. The moving-mesh feature of the ST framework enables high-resolution computation near the blades. The ST-SI enables moving-mesh computation of the spinning rotor. The mesh covering the rotor spins with it, and the SI between the spinning mesh and the rest of the mesh accurately connects the two sides of the solution. The ST-IGA enables more accurate representation of the blade and other turbine geometries and increased accuracy in the flow solution. The STNMUM enables exact representation of the mesh rotation. A general-purpose NURBS mesh generation method makes it easier to deal with the complex turbine geometry. The quality of the mesh generated with this method is improved with a mesh relaxation method based on fiber-reinforced hyperelasticity and optimized zero-stress state. We present computations for the 2D and 3D cases. The computations show the effectiveness of our ST and mesh generation and relaxation methods in flow analysis of the tsunami-shelter VAWT.

Vertical Axis Wind Turbine Aerodynamics: Summary and Review of Momentum Models

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Amin A. Mohammed ◽  
Hassen M. Ouakad ◽  
Ahmet Z. Sahin ◽  
Haitham M. S. Bahaidarah
Keyword(s):  
Performance Evaluation ◽  
Wind Turbine ◽  
Type A ◽  
Vertical Axis ◽  
Short Review ◽  
Performance Estimation ◽  
Vertical Axis Wind Turbine ◽  
Actuator Disk ◽  
Wind Turbine Aerodynamics ◽  
And Performance

Momentum models or streamtube models represent one of the fundamental approaches in modeling the aerodynamics of straight bladed vertical axis wind turbine (SB-VAWT) of Darrieus type. They are based on momentum (actuator disk) theory and widely used in performance evaluation of VAWTs. In this short review, the authors have strived to compile the basic momentum models that have been widely assumed in the literature for design and performance estimation of SB-VAWTs of Darrieus type. A comprehensive demonstration of the formulation needed for the implantation of these models is also proposed. Three streamtube models are investigated in this paper, namely, the single streamtube (SST), the multiple streamtube (MST), and the double multiple streamtube (DMST) models. Each of these models has it merits and demerits which are also thoroughly discussed in this review.

Space–time VMS method for flow computations with slip interfaces (ST-SI)

2015 ◽  
Vol 25 (12) ◽  
pp. 2377-2406 ◽  
Author(s):  
Kenji Takizawa ◽  
Tayfun E. Tezduyar ◽  
Hiroki Mochizuki ◽  
Hitoshi Hattori ◽  
Sen Mei ◽  
...  
Keyword(s):  
High Resolution ◽  
Wind Turbine ◽  
Boundary Layers ◽  
Vertical Axis ◽  
3D Models ◽  
Space Time ◽  
Arbitrary Lagrangian Eulerian ◽  
Vertical Axis Wind Turbine ◽  
Starting Point ◽  
Sliding Interfaces

We present the space–time variational multiscale (ST-VMS) method for flow computations with slip interfaces (ST-SI). The method is intended for fluid–structure interaction (FSI) analysis where one or more of the subdomains contain spinning structures, such as the rotor of a wind turbine, and the subdomains are covered by meshes that do not match at the interface and have slip between them. The mesh covering a subdomain with the spinning structure spins with it, thus maintaining the high-resolution representation of the boundary layers near the structure. The starting point in the development of the method is the version of the arbitrary Lagrangian–Eulerian VMS (ALE-VMS) method designed for computations with "sliding interfaces". Interface terms similar to those in the ALE-VMS version are added to the ST-VMS formulation to account for the compatibility conditions for the velocity and stress. In addition to having a high-resolution representation of the boundary layers, because the ST framework allows NURBS functions in temporal representation of the structure motion, we have exact representation of the circular paths associated with the spinning. The ST-SI method includes versions for cases where the SI is between fluid and solid domains with weakly-imposed Dirichlet conditions for the fluid and for cases where the SI is between a thin porous structure and the fluid on its two sides. Test computations with 2D and 3D models of a vertical-axis wind turbine show the effectiveness of the ST-SI method.

Vertical-Axis Wind Turbine Aerodynamics

2021 ◽  
pp. 1-44
Author(s):  
Delphine De Tavernier ◽  
Carlos Ferreira ◽  
Anders Goude
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Wind Turbine Aerodynamics

scholarly journals CFD analysis on the influence of angle of attack on vertical axis wind turbine aerodynamics

2021 ◽  
Vol 850 (1) ◽  
pp. 012027
Author(s):  
Prateek Srivastava ◽  
Sachin Kansal ◽  
Ashish Talwalkar ◽  
R Harish
Keyword(s):  
Wind Turbine ◽  
Angle Of Attack ◽  
Vertical Axis ◽  
Cfd Analysis ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
Ansys Fluent ◽  
Wind Turbine Aerodynamics ◽  
Fluent Software ◽  
Overall Performance

Abstract The Angle of Attack (AOA) in a Vertical Axis Wind Turbine (VAWT) plays an important role in determining the forces and the power generated by the wind turbine. It is difficult to find the suitable AOA due to the complex and constantly changing wind flow patterns. In this paper, we have performed CFD simulations using Ansys Fluent software, based on the constantly changing AOA. The CFD simulations were conducted by selecting a suitable range of AOA and the velocity of the wind. The selected range of AOA varied from 5 degrees to 25 degrees with increments of 5 degrees and the range of the air velocities varied from 7m/s to 21m/s with increments of 7m/s. The tests were also performed using the X-Foil software. The results obtained from the CFD simulations, done by using the Ansys Fluent Software and from the X-Foil software, were then compared to give a more accurate and optimized AOA and velocity value. This optimization of the AOA could enhance the overall performance of the Vertical Axis Wind turbine.

PIV-Based Analysis of 2D and 3D Flow Phenomena of Vertical Axis Wind Turbine Aerodynamics

2014 ◽  
Author(s):  
Giuseppe Tescione ◽  
Daniele Ragni ◽  
Chenguang He ◽  
Carlos Simao Ferreira ◽  
Gerard G. van Bussel
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
3D Flow ◽  
Wind Turbine Aerodynamics ◽  
Flow Phenomena ◽  
2D And 3D
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