Unsteady Wake and Tailplane Loads of the Common Research Model in Low Speed Stall

Waldmann, Andreas; Konrath, Robert; Lutz, Thorsten; Krämer, Ewald

doi:10.1007/978-3-030-25253-3_2

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…These findings indicate a different buffet mechanism than in the two-dimensional case. The interaction of the separated wake of a wing with the tail plane was investigated numerically for a transport aircraft configuration in low-speed stall conditions by Waldmann et al [14] and Tan et al [15]. It was found that the impact of the turbulent wake leads to a significant oscillation of the tail plane's load.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of wake interactions on a tandem wing configuration in high-speed stall conditions

2023

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In this work, the interaction of the separated wake of the front wing with the rear wing of a tandem configuration is investigated for high-speed stall conditions by means of hybrid RANS/LES simulations, using the zonal AZDES method. After a characterization of the transonic buffet on the front wing, the development of the separated turbulent wake behind the wing is investigated. The interaction of the separated wake with the rear wing is then analyzed in detail. The results reveal that there is a strong variation in the wake characteristics over the buffet cycle, caused by the varying amount of separation on the front wing. During the upstream movement of the shock, the flow is largely separated, resulting in a thick wake with strong, high-frequent fluctuations that can be attributed to large turbulent vortices. On the contrary, when the shock travels downstream, there is only a small amount of separation present, resulting in a thin wake with comparatively low fluctuations that are caused by corresponding smaller turbulent vortices. The impact of the wake of the front wing causes a strong variation in the rear wing loading. An oscillation with a comparatively low frequency can be distinguished from high-frequent fluctuations. The low-frequent oscillation is caused by the variation in the downwash behind the front wing as its lift changes during the buffet cycle. The high-frequent fluctuations are due to the impingement of the turbulent structures onto the rear wing. Because both size and frequency of those vortices vary significantly within the buffet cycle, the amplitude and frequency of the lift and surface pressure fluctuations also change accordingly.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of wake interactions on a tandem wing configuration in high-speed stall conditions

2023

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“…General insight of such wake-tail plane interactions is provided by Tan et al [9]. More specifically, Waldmann et al [10] observed strong load fluctuation of the horizontal tail plane (HTP) due to turbulent wake impingement via CFD. The magnitude of turbulent kinetic energy and the extent of the wake strongly impact the imparted loads.…”

Section: Introductionmentioning

confidence: 99%

Wake Tail Plane Interactions for a Tandem Wing Configuration in High-Speed Stall Conditions

Kleinert¹,

Ehrle²,

Waldmann³

et al. 2023

Preprint

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In this work, wake-tail plane interactions are investigated for a tandem wing configuration in buffet conditions using hybrid RANS/LES simulations with the Automated Zonal Detached Eddy Simulation (AZDES) method. The analyzed configuration consists of two untapered and unswept wing segments, representative of a wing-tail plane configuration. A suitable airfoil for the rear wing was selected based on a preliminary study using the MSES potential solver toolbox. The shock oscillation on the front wing segment and the development of its turbulent wake are characterized, including a spectral analysis of the pressure and velocity fluctuations in the wake and a modal analysis of the flow field applying Proper Orthogonal Decomposition (POD). The impact of the wake on the aerodynamics and loads of the rear wing segment is then studied, with a spectral analysis of its lift and surface pressure oscillations. Finally, the influence of the position and the incidence angle of the rear wing segment are investigated. For the considered flow conditions, 2D buffet is present on the front wing segment with a buffet frequency of f = 118.5 Hz or a Strouhal number of Sr = 0.0745. The characteristics of the wake behind the front wing segment vary strongly within the buffet cycle. During the downstream movement of the shock, the amount

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Hybrid RANS/LES Simulations of the Three-Dimensional Flow at Root Region of a 10 MW Wind Turbine Rotor

Bangga

Weihing

Lutz

et al. 2017

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Unsteady Wake and Tailplane Loads of the Common Research Model in Low Speed Stall

Cited by 6 publications

References 11 publications

Numerical simulation of wake interactions on a tandem wing configuration in high-speed stall conditions

Numerical simulation of wake interactions on a tandem wing configuration in high-speed stall conditions

Wake Tail Plane Interactions for a Tandem Wing Configuration in High-Speed Stall Conditions

Hybrid RANS/LES Simulations of the Three-Dimensional Flow at Root Region of a 10 MW Wind Turbine Rotor

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