A vortex-based tip/smearing correction for the actuator line

Forsting, Alexander Meyer; Pirrung, Georg Raimund; Ramos‐García, Néstor

doi:10.5194/wes-4-369-2019

Cited by 57 publications

(74 citation statements)

References 26 publications

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“…It also remains a dynamic correction that takes into account how the trailed vorticity changes over time and moves away from the blades. This faster and simpler version of the smearing correction is openly available (Meyer Forsting et al, 2019b).…”

Section: Discussionmentioning

confidence: 99%

Brief communication: A fast vortex-based smearing correction for the actuator line

2020

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Abstract. The actuator line is a lifting line representation of aerodynamic surfaces in computational fluid dynamics applications but with non-singular forces, which reduces the self-induced velocities at the line. The vortex-based correction by Meyer Forsting et al. (2019a) recovers this missing induction and thus the intended lifting line behaviour of the actuator line. However, its computational cost exceeds that of existing tip corrections and quickly grows with blade discretization. Here we present different methods for reducing its computational cost to the level of existing corrections without jeopardizing the stability or accuracy of the original method. The cost is reduced by at least 98 %, whereas the power is maximally affected by 0.8 % with respect to the original formulation. This accelerated smearing correction remains a dynamic correction by modelling the variation in trailed vorticity over time. The correction is openly available (Meyer Forsting et al., 2019b).

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Section: Discussionmentioning

confidence: 99%

Brief communication: A fast vortex-based smearing correction for the actuator line

2020

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“…A comparison of the different aerodynamic and flow solvers in MIRAS against measurements and other codes for wind turbines as well as translating wings are available in previous works 17,26,32‐35 …”

Section: Methodsmentioning

confidence: 99%

Aero‐hydro‐servo‐elastic coupling of a multi‐body finite‐element solver and a multi‐fidelity vortex method

2020

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The manuscript presents a novel aero‐hydro‐servo‐elastic coupling framework, MIRAS‐HAWC2. In this coupling, the wind turbine blades and rotor‐wake aerodynamics are modeled using a modified lifting‐line theory which accounts for blade curvature, combined with a hybrid vortex method. The wind turbine structure and foundation are modeled using a finite‐element and multi‐body system approach. Last, hydrodynamics are modeled using Airy wave theory together with Morison's equation. An initial assessment of the performance of the aeroelastic coupling framework has been performed for steady rotor‐only cases, assuming laminar inflow without shear. This included a comparison against fully resolved computational fluid dynamics, for both stiff and flexible blades showing an excellent agreement. In a second stage, the aero‐hydro‐servo‐elastic coupling is used, comparing MIRAS‐HAWC2 as well as blade‐element momentum‐based simulations with selected results from the Offshore Code Comparison Collaboration projects (OC3 and OC4), which study the NREL 5 MW turbine mounted on different offshore support structures. A good agreement has been obtained for the simulations of a monopile with rigid foundation, a tripod, and jacket support structures.

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“…The impact of the regularization is clearly observed on Figure 3, and the choice of the regularization parameter can have a drastic impact on the results. The topic of regularization is being actively researched (Martínez-Tossas and Meneveau, 2019;Meyer Forsting et al, 2019;Li et al, 2020).…”

Section: Elliptical Wingmentioning

confidence: 99%

A multi-purpose lifting-line flow solver for arbitrary wind energy concepts

Branlard

Brownstein²,

Strom³

et al. 2021

Preprint

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Abstract. In this work, we extend the AeroDyn module of OpenFAST to be able to support arbitrary collections of wings, rotors and towers. The new standalone AeroDyn driver supports arbitrary motions of the lifting-surfaces and complex turbulent inflows. We describe the features and updates necessary for the implementation of the new AeroDyn driver. We present different case studies of the driver to illustrate its application to concepts such as: multi-rotors, kites, or vertical axis wind turbines. We perform verification and validation of some of the new features using the following test cases: an elliptical wing, a horizontal axis wind turbine, and a 2D and 3D vertical axis wind turbines. The wind turbine simulations are compared to field measurements. We use this opportunity to point out some limitations of current models and highlight areas which we think should be the focus of future research in wind turbine aerodynamics.

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A vortex-based tip/smearing correction for the actuator line

Cited by 57 publications

References 26 publications

Brief communication: A fast vortex-based smearing correction for the actuator line

Brief communication: A fast vortex-based smearing correction for the actuator line

Aero‐hydro‐servo‐elastic coupling of a multi‐body finite‐element solver and a multi‐fidelity vortex method

A multi-purpose lifting-line flow solver for arbitrary wind energy concepts

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