Simulation of Aircraft Encounters with Perturbed Vortices Considering Unsteady Aerodynamic Effects

Bieniek, David; Luckner, Robert

doi:10.2514/1.c032383

Cited by 10 publications

(6 citation statements)

References 14 publications

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“…However, perturbations of the wake vortices 13 and the vortex decay 12 were found to alleviate the impact of WVE on the flight dynamic response of rigid aircraft (for the particular problems investigated). This was further demonstrated by Loucel and Crouch 49 in flight simulation studies of an autopiloted passenger aircraft encountering vortices at different stages of the breakup process.…”

Section: Generating Aircraftmentioning

confidence: 99%

“…13 Numerous flight tests by the German Aerospace Research Center (DLR) have provided significant insight into the impact of WVE on the vehicle dynamic response of the encountering (rigid) aircraft due to possible rolling moments induced by the wake vortices. 9,14,15 Such aggressive excitations of the vehicle dynamics can lead to critical loads on weight-optimized aircraft components.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Load Alleviation in Wake Vortex Encounters

Hesse

Palacios

2016

Journal of Guidance, Control, and Dynamics

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This paper introduces an integrated approach for flexible-aircraft timedomain aeroelastic simulation and controller design suitable for wake encounter situations. The dynamic response of the vehicle, which may be subject to large wing deformations in trimmed flight, is described by a geometrically-nonlinear finite-element model. The aerodynamics are modeled using the unsteady vortex lattice method and include the arbitrary

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Section: Generating Aircraftmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Load Alleviation in Wake Vortex Encounters

Hesse

Palacios

2016

Journal of Guidance, Control, and Dynamics

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“…Most importantly, it omits the possibility of strong encounters that result from an alignment of the aircraft's flight path with the curved vortex axes, as mentioned in [16]. Spence et al [22] and Allerton and Spence [23] describe a direct but highly complex and computationally intensive approach to integrate LES velocity fields into flight simulations.…”

Section: B Integration Of Velocity Fields From Large-eddy Simulationmentioning

confidence: 99%

“…In this form, the strip method computes quasi-steady forces and moments that act instantly on the encountering aircraft once the surrounding vortex flow changes. The extension to account for unsteady aerodynamic effects during computation of the forces and moments (i.e., the delay and amplitude reduction of the lift response with higher frequency) is described in [16].…”

Section: Structure and Elements Of Wake-vortex Encounter Simulationmentioning

confidence: 99%

“…These fixed time histories were then implemented in a full-flight simulator (so-called fixed encounters [2]) to perform piloted encounter simulations and compare the pilot's hazard assessment of encounters with straight and perturbed vortices. Using the analytical models of vortex deformation described by Loucel and Crouch, piloted encounter flight simulations during landing approach were also conducted at Technische Universität Berlin (TUB) [16]. This study showed an increased variation of bank angle upsets for encounters with wavy vortices, whereas vortex rings generated significantly lower aircraft disturbances.…”

mentioning

confidence: 99%

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Simulation Methods for Aircraft Encounters with Deformed Wake Vortices

Bieniek¹,

Luckner²,

Visscher³

et al. 2016

Journal of Aircraft

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Simulation of aircraft wake-vortex encounters is regularly applied in the research toward revised aircraft separation minima. Most encounter flight simulation studies have used a pair of straight counter-rotating vortices. However, after being shed by the generating aircraft, the wake vortices begin to develop a growing deformation due to the long-wave Crow instability, especially under low-turbulent atmospheric conditions when vortices decay slowly. In this study, two methods for simulation of aircraft encounters with such perturbed wake vortices are described and compared. The first method uses a vortex simulation model, which is based on analytical models of the deformation that consider the large-scale vortex shapes. The second method applies vortex-velocity fields from high-fidelity largeeddy simulations. It offers the highest possible level of realism and is used as the reference. The resulting aircraft responses induced by wavy vortices and vortex rings are reproduced with good quality by the vortex simulation model. The comparison of both methods shows that the vortex simulation model captures the overall impact of vortex deformation on the aircraft upsets. It can be used for future safety assessments that require a large number of encounter simulations.

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In-flight remote sensing and identification of gusts, turbulence, and wake vortices using a Doppler LIDAR

2017

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In this paper, in-flight remote sensing technologies are considered for two applications: active load alleviation of gust and turbulence and wake impact alleviation. The paper outlines the strong commonalities in terms of sensors and measurement post-processing algorithms and presents also the few differences and their consequences in terms of postprocessing. The way the post-processing is being made is detailed before showing results for both applications based on a complete and coupled simulation (aircraft reaction due to disturbances and control inputs during the simulation is influencing the sensor measurements). The performances in terms of wind reconstruction quality for the gust/turbulence case and in terms of wake impact alleviation performance for the wake vortex case are shown based on simulations and are very promising.

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Simulation of Aircraft Encounters with Perturbed Vortices Considering Unsteady Aerodynamic Effects

Cited by 10 publications

References 14 publications

Dynamic Load Alleviation in Wake Vortex Encounters

Dynamic Load Alleviation in Wake Vortex Encounters

Simulation Methods for Aircraft Encounters with Deformed Wake Vortices

In-flight remote sensing and identification of gusts, turbulence, and wake vortices using a Doppler LIDAR

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