FEM/CFD analysis of wings at different angle of attack

A CFD analysis of a solar air heater has been carried out using V-shaped ribs as artificial roughness on the absorber plate. The relative roughness pitch, P/e = 6-12, Reynolds number of 3800-18000, relative roughness height, e/D = = 0.042, and angle of attack, ? = 30?-75?, have been selected as design variables of V-shaped rib for analysis. The ANSYS FLUENT 15.0 with renormalization group k-? turbulence model is selected for the analysis of computational domain of solar air heater. The enhancement of Nusselt number and friction factor with Reynolds number for different values of a relative roughness pitch are presented and discussed by CFD analysis. The effect of angle of attack and Reynolds number on enhancement of Nusselt number and friction factor is also presented. The optimum value of rib configuration based on constant pumping power requirement has been derived using thermohydraulic performance parameter and has been found maximum at angle of attack of 60? and P/e = 10.

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CFD analysis of the angle of attack for a vertical axis wind turbine blade

Energy Conversion and Management ◽

10.1016/j.enconman.2018.12.054 ◽

2019 ◽

Vol 182 ◽

pp. 154-165 ◽

Cited By ~ 21

Author(s):

Mohamed M. Elsakka ◽

Derek B. Ingham ◽

Lin Ma ◽

Mohamed Pourkashanian

Keyword(s):

Wind Turbine ◽

Turbine Blade ◽

Angle Of Attack ◽

Vertical Axis ◽

Wind Turbine Blade ◽

Cfd Analysis ◽

Vertical Axis Wind Turbine

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The Interaction of Downwind Sails

Volume 1: Symposia, Parts A and B ◽

10.1115/fedsm2006-98173 ◽

2006 ◽

Author(s):

William C. Lasher

Keyword(s):

Driving Force ◽

Angle Of Attack ◽

The Other ◽

Surprising Result ◽

Cfd Analysis ◽

Projected Area ◽

General Direction ◽

Optimum Angle

When a sailboat is sailing in the general direction of the wind, it is known as downwind sailing. Under these conditions boats generally carry two sails — a mainsail and a spinnaker. The flow over these sails is complicated and poorly understood. An issue of importance to sailors is how the adjustment of one sail affects the aerodynamics of the other sail and the total driving force. In the present work a CFD analysis was performed on two different sailboat rigs, with an emphasis on the interactions between the main and spinnaker. The results show that the optimum angle of attack of the mainsail is generally 60° to 70°, depending on the direction of the wind relative to the boat. The correct setting for a mainsail has been a point of debate amongst sailors, and the present analysis supports the theory of easing the mainsail until it luffs (or flaps), then pulling it in. A surprising result is that when the wind is directly behind the boat, the mainsail should not be set to maximize projected area, but eased out past 90°. This is difficult to accomplish in practice due to restrictions of the rig, but raise some interesting questions.

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Investigation on airfoil operating in Ground Effect region

International Journal of Engineering & Technology ◽

10.14419/ijet.v3i4.3245 ◽

2014 ◽

Vol 3 (4) ◽

pp. 540 ◽

Cited By ~ 1

Author(s):

Nikhil Pillai ◽

Anil T. ◽

Aravind Radhakrishnan ◽

Rahul Vinod ◽

Sudheesh Kumar E. ◽

...

Keyword(s):

Reynolds Number ◽

Advisory Committee ◽

Special Class ◽

Free Stream ◽

Angle Of Attack ◽

Ground Effect ◽

Water Bodies ◽

Cfd Analysis ◽

Aerodynamic Efficiency ◽

Wing In Ground Effect

The idea of using a wing in ground effect vehicle has been suggested with the objective of developing a very economical and efficient means of rapid transportation across water bodies. This paper investigates into wing in ground effect airfoil geometry. ANSYS is used to perform the CFD analysis of the airfoils. CFD analysis has been performed on various airfoils operating in the ground effect region and a special class of airfoil called DHMTU has been found to have maximum aerodynamic efficiency. The DHMTU studied here is DHMTU 8-40-2-10-3-6-2-15. Aerodynamic efficiency for this particular airfoil has been determined through CFD analysis at various angles of attack. It has been found that the DHMTU possesses superior aerodynamic efficiency at low angle of attack and the maximum aerodynamic efficiency is found at 60 angle of attack. From CFD analysis it has also been determined that as the proximity to the ground reduces, the value of lift increases. The characteristics of this airfoil at various air speeds have also been determined through CFD analysis. These studies have illustrated the unique characteristics of the DHMTU airfoils and indicated areas for further optimization of the design of ground effect airfoils. The use of this airfoil for the ground effect vehicle can further lead to increase in efficiency of the craft.Abbreviations:CFD Computational Fluid DynamicsDHMTU Department Of Hydro-Mechanics of the Marine Technical UniversityNACA National Advisory Committee on AeronauticsL/D Lift to Drag RatioWIG Wing in GroundV Free stream velocityRe Reynolds number h/c Height to Chord RatioCL Coefficient of liftCD Coefficient of dragAOA Angle Of Attack

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

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/850/1/012027 ◽

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.

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