Discrete vortex method simulations of the aerodynamic admittance in bridge aerodynamics

Rasmussen, J.; Hejlesen, Mads Mølholm; Larsen, Allan; Walther, Jens Honoré

doi:10.1016/j.jweia.2010.06.011

Cited by 39 publications

(43 citation statements)

References 32 publications

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“…Following the work of Prendergast and McRobie (2006), Prendergast (2007) and Rasmussen et al (2010) the effect of turbulent oncoming flow is simulated by releasing vortex particles upstream of the bridge section to induce velocity fluctuations in the oncoming flow. This is done by seeding pre-generated vortex particles in a single column located at a specified distance upstream of the bridge section.…”

Section: Simulating the Effect Of Turbulent Upstream Flowmentioning

confidence: 99%

“…The generated field is a synthetic flow field in which the fluctuations of the two velocity components posses the same statistical characteristics as the corresponding two velocity components of a 3D turbulent flow field measured in the atmospheric boundary layer. However the extensive analysis presented in Prendergast and McRobie (2006), Prendergast (2007), Rasmussen et al (2010), and Rasmussen (2011) showed that when the generated velocity field is converted to circulation and simulated in the discrete vortex method it is indeed possible to admissibly reproduce the statistical characteristics of the input energy density spectra.…”

Section: Simulating the Effect Of Turbulent Upstream Flowmentioning

confidence: 99%

“…The circulation of each cell of the velocity field was then calculated and included in the DVM simulation by seeding the circulation as vortex particles throughout the simulation. Rasmussen et al (2010) used a similar approach, based on the DVM implementation DVMFLOW by Walther (1994) and Walther and Larsen (1997), to obtain an extended aerodynamic analysis of the effect of a turbulent oncoming flow. Emphasis was placed on the spectral transfer functions between the turbulent velocity fluctuations of the oncoming wind and the resulting buffeting forces acting on the bridge section.…”

Section: Introductionmentioning

confidence: 99%

“…This transfer function is referred to as the aerodynamic admittance function. Rasmussen et al (2010) showed that the aforementioned method is able to successfully calculate the aerodynamic admittance function of a flat plate.…”

Section: Introductionmentioning

confidence: 99%

“…In this work only a brief outline of the method is presented and the reader is referred to Rasmussen et al (2010) and Rasmussen (2011) for a detailed description and validation of the applied numerical method.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

On estimating the aerodynamic admittance of bridge sections by a mesh-free vortex method

Hejlesen

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et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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Section: Simulating the Effect Of Turbulent Upstream Flowmentioning

confidence: 99%

Section: Simulating the Effect Of Turbulent Upstream Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On estimating the aerodynamic admittance of bridge sections by a mesh-free vortex method

Hejlesen

Rasmussen

Larsen

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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Vortex simulations of wind turbines operating in atmospheric conditions using a prescribed velocity‐vorticity boundary layer model

et al. 2018

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A prescribed velocity-vorticity boundary layer model for the vorticity transport equation is proposed, which corrects the unphysical upward deflection of the wake seen in a simpler prescribed velocity shear approach. A Lagrangian implementation of the boundary layer model has been investigated using our in-house vortex solver MIRAS. The MIRAS code contains both an aerodynamic part and a structural-mechanical part taking into account aeroelastic phenomena. The solver is employed to simulate flows around wind turbines and uses a combination of filaments and particles in order to mimic the vorticity released by the wind turbine blades. The vorticity is interpolated onto a uniform Cartesian mesh, where the interaction is efficiently calculated by an fast Fourier transform-based method. Simulations of wind turbines operating in an atmospheric boundary layer flow are carried out and analysed in detail for a range of scenarios. The manuscript focuses on studying the influence of wind shear and turbulence, which is varied to mimic natural atmospheric conditions. A traverse virtual probe up to 30 diameters downstream of the rotor plane is used to investigate the properties of the turbulent wake flow for the different cases.This includes mean and standard deviation of the streamwise velocity component, wake deficit, Reynolds stresses, and power spectral density of the velocity signal. The results show that combining a prescribed boundary layer approach with a vortex method gives consistent and physically correct results if properly implemented. KEYWORDS aeroelasticity, atmospheric boundary layer, turbulence, vortex method, wind shear, wind turbine INTRODUCTIONVortex methods initially entered the wind energy community as a more physically accurate alternative to the basic Blade Element Momentum method (BEM) technique, which is based on 1-dimensional momentum theory and aimed to be used for rotor design. However, vortex methods have quickly developed in recent years and now can be seen as an advanced and matured tool capable of performing high-fidelity simulations of 1 or more turbines. Vortex methods are not only of interest during the actual rotor design process but also as analysis tool to investigate more complex scenarios, including aeroelastic, turbulent inflow, and shear effects. [1][2][3][4][5][6] Vortex solvers can be combined with different aerodynamic models depending on the degree of complexity required. Enumerated in ascending complexity, they can be classified as lifting line (LL) vortex lattice, potential panel method, and viscous-inviscid panel method. The latter class being the more physically correct, since it resolves the actual geometry of the blade accounting for the viscous effects enclosed inside the boundary layer.The present paper focuses on the lower degree of fidelity in terms of aerodynamic modeling of the wind turbine blades, using the LL approach. With the LL model, the rotor blades are represented by discrete filaments, which account for the bound vortex strength and release vorticity into the ...

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Effect of a Wind Turbine on the Turbulent Inflow

Branlard

2017

Research Topics in Wind Energy

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Discrete vortex method simulations of the aerodynamic admittance in bridge aerodynamics

Cited by 39 publications

References 32 publications

On estimating the aerodynamic admittance of bridge sections by a mesh-free vortex method

On estimating the aerodynamic admittance of bridge sections by a mesh-free vortex method

Vortex simulations of wind turbines operating in atmospheric conditions using a prescribed velocity‐vorticity boundary layer model

Effect of a Wind Turbine on the Turbulent Inflow

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