Advances in Parallelization and High-Fidelity Simulation of Helicopter Phenomena

Kranzinger, P.; Kowarsch, Ulrich; Schuff, Matthias; Keßler, Manuel; Krämer, Ewald

doi:10.1007/978-3-319-24633-8_31

Cited by 10 publications

(5 citation statements)

References 11 publications

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“…Since the first application of CFD to the rotary wing (Caradonna and Isom 1972), recent solutions of Reynolds-Averaged Navier-Stokes (RANS) equations offer substantial developments in the computation of complex aero-dynamics around the rotorcraft (Ahmad and Duque 1996, Pomin and Wagner 2002, Costes et al 2012, Kranzinger et al 2016) and the similar applications (Adeeb et al 2016). In this paper, a CFD-based methodology is adopted to simulate the aero-dynamic characteristics, and therefore, the performance of hovering AUH rotor blades.…”

Section: Computational Methodologymentioning

confidence: 99%

Aerodynamically Efficient Rotor Design for Hovering Agricultural Unmanned Helicopter

Haider

Sohn

Won

et al. 2017

JAFM

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Unmanned aerial vehicles, especially agricultural unmanned helicopters (AUH), are nowadays extensively used in precision agriculture. AUHs have recently become responsible for spraying fertilizers and pesticides for crop yields. The strong downward rotating flow produced by the main rotor helps very uniform crop spraying which determines that how important is the aerodynamics of rotor blade in AUH. In this work, the aerodynamic performance of AUH rotor blades is evaluated and an efficient blade is obtained by numerically investigating the influence of design variables on the aerodynamics of rotor blades. The design variables consist of airfoil shape, pitch settings, and twist angle. The limited power available in hover and aerodynamic requirements (lift and drag) are the aerodynamic constraints. This analysis only considers the hovering flight condition at a constant rotational speed. The aerodynamically efficient rotor blade which is based on gradually varying and linearly twisted airfoil shapes, show a significant improvement in hover performance with relatively uniform blade loading. After testing, the optimum blade can be used as the main rotor in the AUH to perform precision farming.

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Section: Computational Methodologymentioning

confidence: 99%

Aerodynamically Efficient Rotor Design for Hovering Agricultural Unmanned Helicopter

Haider

Sohn

Won

et al. 2017

JAFM

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“…For the efficient computation on large High Performance Computing (HPC) systems using several thousand computation processors, continuous development to improve the code performance both on node level as well as for massive parallel scaling was accomplished by IAG [15].…”

Section: Cfd: Flowermentioning

confidence: 99%

Aerodynamics and flight mechanics analysis of Airbus Helicopters’ compound helicopter RACER in hover under crosswind conditions

et al. 2019

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In recent years, various helicopter manufacturers have been focusing increasingly on the development of new high-speed rotorcraft configurations, one of them being the compound helicopter RACER of Airbus Helicopters (AH). However, these new configurations encounter new aeromechanic challenges, in terms of aerodynamic interactions, flight mechanics stability, rotor dynamics or aeroacoustic noise emission, to name only a few. In the following study, the behaviour of RACER in hover under the influence of crosswinds from eight different directions is investigated to support AH at the de-risking of RACER for this flight condition prior to the first flight. Therefore, a multidisciplinary, high-fidelity tool chain for coupled and trimmed aerodynamic simulations of the complete rotorcraft is applied. The presentation of the results is organized in three parts. In the first part, the flight mechanic behaviour is analysed and successful de-risking of ground clearance is shown. The second part focuses on the performance of the main rotor, the lateral rotors and the tail surfaces under wind conditions and shows that minimal power is required for headwind. In the last part, an analysis of the engines is performed, including a closer look at the inflow quality to the core engine and the convection of the hot exhaust gases.

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“…FLOWer is a compressible, dual time-stepping, block structured Reynolds-averaged Navier-Stokes (RANS) solver developed by the German Aerospace Center (DLR) (Kroll et al, 2000). The use of independent grids for bodies and background is enabled by the overlapping grid technique CHIMERA, one of FLOWers' main features.…”

Section: Cfd Solvermentioning

confidence: 99%

“…For the technical realization, an existing interface that was developed to couple SIMPACK with the fluid solver ANSYS CFX for the investigation of a tidal current turbine (Arnold et al, 2013) is extended. Furthermore, libraries for grid deformation and load integration which have recently been developed and integrated into FLOWer (Schuff et al, 2014;Kranzinger et al, 2016) are extended for the coupling with SIMPACK. Without restrictions in functionality, the setup of the coupling is kept simple and the dependencies between MBS and CFD models are low.…”

Section: Fluid-structure Interactionmentioning

confidence: 99%

Advanced computational fluid dynamics (CFD)–multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines

et al. 2018

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Abstract. The low-frequency emissions from a generic 5 MW wind turbine are investigated numerically. In order to regard airborne noise and structure-borne noise simultaneously, a process chain is developed. It considers fluid–structure coupling (FSC) of a computational fluid dynamics (CFD) solver and a multi-body simulations (MBSs) solver as well as a Ffowcs-Williams–Hawkings (FW-H) acoustic solver. The approach is applied to a generic 5 MW turbine to get more insight into the sources and mechanisms of low-frequency emissions from wind turbines. For this purpose simulations with increasing complexity in terms of considered components in the CFD model, degrees of freedom in the structural model and inflow in the CFD model are conducted. Consistent with the literature, it is found that aeroacoustic low-frequency emission is dominated by the blade-passing frequency harmonics. In the spectra of the tower base loads, which excite seismic emission, the structural eigenfrequencies become more prominent with increasing complexity of the model. The main source of low-frequency aeroacoustic emissions is the blade–tower interaction, and the contribution of the tower as an acoustic emitter is stronger than the contribution of the rotor. Aerodynamic tower loads also significantly contribute to the external excitation acting on the structure of the wind turbine.

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Advances in Parallelization and High-Fidelity Simulation of Helicopter Phenomena

Cited by 10 publications

References 11 publications

Aerodynamically Efficient Rotor Design for Hovering Agricultural Unmanned Helicopter

Aerodynamically Efficient Rotor Design for Hovering Agricultural Unmanned Helicopter

Aerodynamics and flight mechanics analysis of Airbus Helicopters’ compound helicopter RACER in hover under crosswind conditions

Advanced computational fluid dynamics (CFD)–multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines

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