Numerical Simulation of a Full Helicopter Configuration Using Weak Fluid-Structure Coupling

Dietz, Markus; Khier, Walid; Knutzen, Bjoern; Wagner, Siegfried; Krämer, Ewald

doi:10.2514/6.2008-401

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The resulting rotor controls and elastic deformation were used to modify the blade surface geometry following the approach presented in [10,11,13]. The process, described in detail in [12,17], is repeated until the variations in elastic blade deformation and rotor control angles have fallen below a user defined tolerance.…”

Section: Fluid-structure Couplingmentioning

confidence: 99%

“…Nevertheless, the most recent advances in helicopter CFD account for complete helicopter configurations with weak CSD/CFD coupling. In [4] the two-rotor CH-47 helicopter was considered, while the GOAHEAD wind-tunnel model was simulated in [12,17]. A preliminary comparison of the trimmed blind calculations for the GOAHEAD model with experiments was presented in [16].…”

Section: Introductionmentioning

confidence: 99%

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CFD prediction of air flow past a full helicopter configuration

Biava¹,

Khier

Vigevano

2012

Aerospace Science and Technology

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The present study is one of the first attempts to exploit the GOAHEAD data base to perform a code-tocode evaluation on complete helicopter aerodynamics. The numerical results of two GOAHEAD partners, the German Aerospace Center (DLR) and Politecnico di Milano (PoliMi) are presented and compared to experimental measurements. The study also addresses an evaluation of two different approaches to predict helicopter flows. The first, applied by DLR, accounts for rotor trim and elastic effects by weak fluid-structure coupling. The PoliMi approach, on the other hand, enforces a prescribed kinematics, taken directly from the experiment, on a rigid blade. The simulations refer to a complete helicopter windtunnel model, featuring a scaled NH90 fuselage, the ONERA 7AD main rotor, a scaled BO105 tail rotor, a rotor hub and a pylon, all located inside the 8 m × 6 m test section of the DNW low-speed wind tunnel. The flight conditions correspond to cruise flight at Ma = 0.204 and fuselage attitude α = −2.5 •. The comparisons demonstrate the capability of present unsteady RANS solvers to predict flow fields around complete helicopters.

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Section: Fluid-structure Couplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CFD prediction of air flow past a full helicopter configuration

Biava¹,

Khier

Vigevano

2012

Aerospace Science and Technology

Self Cite

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show abstract

“…Since rigid blade assumption usually leads to non trivial deviation in the onset of the flow along the blade, a proper simulation of blade dynamics and elastic deformation is essential for an accurate prediction of rotor performance ( [4] and [5]). The measured displacement of the blade can be imposed in CFD simulation as in [6], or, instead, the deformation can be computed by a rotor simulation code coupled (loosely or directly) to the CFD solver ( [3], [7] and [8]).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Complete Helicopter Configuration in Forward Flight Using Fluid-Structure Coupling

Khier

2013

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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This paper highlights the results obtained by coupling the aeromechanic tool HOST with the DLR CFD solver FLOWer within the framework of the EU-Project GOAHEAD. The process was applied to predict the flow around the GOAHEAD configuration in forward flight at Mach number of 0.204 and fuselage pitch angle of-2.5 o. Comparisons of the CFD results with experimental measurements revealed very good agreement for main rotor pressure and the front part of the fuselage. Main rotor power could be predicted with an accuracy of 0.25%.

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Simulation of a complete helicopter: A CFD approach to the study of interference effects

Biava¹,

Vigevano²

2012

Aerospace Science and Technology

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Numerical Simulation of a Full Helicopter Configuration Using Weak Fluid-Structure Coupling

Cited by 4 publications

References 7 publications

CFD prediction of air flow past a full helicopter configuration

CFD prediction of air flow past a full helicopter configuration

Numerical Simulation of a Complete Helicopter Configuration in Forward Flight Using Fluid-Structure Coupling

Simulation of a complete helicopter: A CFD approach to the study of interference effects

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