Computation of Induced Drag for 3D Wing with Volume Integral (Trefftz Plane) Technique

Monsch, Scott; Figliola, Richard; Thompson, Ernest; Camberos, José

doi:10.2514/6.2007-1079

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…Li and Stewart reported on 2D validation studies for predicting drag by means of calculating the generation both for airfoils and for viscous pipe flows [9]. Stewart [10] and Monsch et al [11] calculated the drag force of a 3D wing by performing a volume integration within the numerical domain and a surface integral over the outlet of the domain.…”

Section: Introductionmentioning

confidence: 99%

CFD Prediction of Airfoil Drag in Viscous Flow Using the Entropy Generation Method

Wang

Liu

et al. 2018

Mathematical Problems in Engineering

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A new aerodynamic force of drag prediction approach was developed to compute the airfoil drag via entropy generation rate in the flow field. According to the momentum balance, entropy generation and its relationship to drag were derived for viscous flow. Model equations for the calculation of the local entropy generation in turbulent flows were presented by extending the RANS procedure to the entropy balance equation. The accuracy of algorithm and programs was assessed by simulating the pressure coefficient distribution and dragging coefficient of different airfoils under different Reynolds number at different attack angle. Numerical data shows that the total entropy generation rate in the flow field and the drag coefficient of the airfoil can be related by linear equation, which indicates that the total drag could be resolved into entropy generation based on its physical mechanism of energy loss.

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Section: Introductionmentioning

confidence: 99%

CFD Prediction of Airfoil Drag in Viscous Flow Using the Entropy Generation Method

Wang

Liu

et al. 2018

Mathematical Problems in Engineering

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Evaluating the effect of a ducted winglet on the induced drag of wind turbine blade using CFD and Trefftz plane analysis

Vincalek

Walton

Evans

2023

Engineering with Computers

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A novel patented ducted winglet design is compared, using numerical simulations, to an unmodified wing tip and a standard winglet in the context of a wind turbine blade. The aim of the ducted winglet is to reduce the induced drag. This reduction of induced drag, at the wing tip, would be particularly beneficial to wind turbine performance. Throughout the comparison, we explore the aerodynamic phenomena described in the patent which claim to explain how the ducted winglet reduces induced drag. The simulations were run using a CFD solver, FLITE3D, that has been thoroughly validated on industrial scale aerodynamic problems. A mesh convergence study was carried out to ensure that the results have sufficient numerical accuracy for a consistent ranking with respect to the lift-to-drag ratio. A Trefftz plane analysis is conducted to measure the effect of the duct on induced drag. To the best of our knowledge, this is the first time that such a ducted design is tested in this context and compared to a standard unmodified blade and winglet. We found that the ducted winglet has a higher lift-to-drag ratio than an unmodified wing tip, but lower than a non-ducted winglet. Despite this, there is clear evidence that the duct had a positive influence on the induced drag. Our results show that with future optimisation this ducted winglet may prove beneficial to wind turbine design.

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Exergy-Based Design Methodology for Airfoil Shape Optimization and Wing Analysis

2011

Exergy Analysis and Design Optimization for Aerospace Vehicles and Systems

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Computation of Induced Drag for 3D Wing with Volume Integral (Trefftz Plane) Technique

Cited by 4 publications

References 3 publications

CFD Prediction of Airfoil Drag in Viscous Flow Using the Entropy Generation Method

CFD Prediction of Airfoil Drag in Viscous Flow Using the Entropy Generation Method

Evaluating the effect of a ducted winglet on the induced drag of wind turbine blade using CFD and Trefftz plane analysis

Exergy-Based Design Methodology for Airfoil Shape Optimization and Wing Analysis

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