Assessment of CFD methods against experimental flow measurements for helicopter flows

Antoniadis, Antonios; Drikakis, Dimitris; Zhong, B.; Barakos, George N.; Steijl, R.; Biava, Massimo; Vigevano, Luigi; Brocklehurst, A.; Boelens, O.J.; Dietz, Markus; Embacher, Martin; Khier, Walid

doi:10.1016/j.ast.2011.09.003

Cited by 52 publications

(29 citation statements)

References 14 publications

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“…Time advancement is carried out with a dual-time formulation, employing a second-order backward differentiation formula to approximate the time derivative and a fully unfactored implicit scheme in pseudotime. The generalized conjugate gradient, in conjunction with a block incomplete lower-upper preconditioner, is used to solve the resulting linear system; see [44,49,50].…”

Section: Computational Fluid Dynamics Modelsmentioning

confidence: 99%

Linear Reduced-Order Model for Unsteady Aerodynamics of an L-Shaped Gurney Flap

Motta

Quaranta

2015

Journal of Aircraft

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Analysis of ballistic capture orbits in Sun–planet systems is conducted in this paper. This mechanism utilizes purely gravitational forces, and may occur in non-Keplerian regimes. Ballistic capture orbits are generated by proper manipulation of sets of initial conditions that satisfy a simple definition of stability. Six Sun–planet systems are considered, including the inner planets, Jupiter, and Saturn. The role of planets orbital eccentricity, their true anomaly, and mass ratios is investigated. Moreover, the influence of the post-capture orbit in terms of inclination and orientation is also assessed. Analyses are performed from qualitative and quantitative perspective. The quality of capture orbits is measured by means of the stability index, whereas the capture ratio gives information on their statistical occurrence. Some underlying principles on the selection of the dynamical model, the initial true anomaly, and inclination are obtained. These provide a reference for practical cases

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Section: Computational Fluid Dynamics Modelsmentioning

confidence: 99%

Linear Reduced-Order Model for Unsteady Aerodynamics of an L-Shaped Gurney Flap

Motta

Quaranta

2015

Journal of Aircraft

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“…The actuator disc method has been used together, with the Reynolds averaged Navier-Stokes (RANS) equations, for many years and for many applications including helicopter rotors [1], horizontal axis wind turbines [2], and horizontal axis tidal turbines [3,4] alike. The actuator disc method represents a turbine as a simple disc of similar dimensions to the rotor and is used to approximate the forces applied to the flow.…”

Section: Introductionmentioning

confidence: 99%

Computational Actuator Disc Models for Wind and Tidal Applications

Johnson

Francis

Howe

et al. 2014

Journal of Renewable Energy

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This paper details a computational fluid dynamic (CFD) study of a constantly loaded actuator disc model featuring different boundary conditions; these boundary conditions were defined to represent a channel and a duct flow. The simulations were carried out using the commercially available CFD software ANSYS-CFX. The data produced were compared to the one-dimensional (1D) momentum equation as well as previous numerical and experimental studies featuring porous discs in a channel flow. The actuator disc was modelled as a momentum loss using a resistance coefficient related to the thrust coefficient (CT). The model showed good agreement with the 1D momentum theory in terms of the velocity and pressure profiles. Less agreement was demonstrated when compared to previous numerical and empirical data in terms of velocity and turbulence characteristics in the far field. These models predicted a far larger velocity deficit and a turbulence peak further downstream. This study therefore demonstrates the usefulness of the duct boundary condition (for computational ease) for representing open channel flow when simulating far field effects as well as the importance of turbulence definition at the inlet.

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“…Unmanned aerial vehicles (UAVs) are predominantly utilised in diverse applications [1] including defence, surveillance, societal missions, environmental monitoring and disaster tasks. Compare to fixed and flapping wing UAVs, rotary-wing vehicles are having superior hovering characteristics which is very much needed in multifaceted environments.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Interaction Studies on Amphibious Vehicle in Forward and Hovering Flight

Vikram¹,

Esakki²,

Manova³

et al. 2019

IJAME

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Unmanned aerial vehicles (UAVs) have gained a lot of attention in recent times due to its versatility in deployment for multifaceted operations. The development of amphibious UAVs with inculcating the features of hovercraft and multi-rotor has tremendous impact on military, naval and coastal guard applications. Stability and performance of this kind of vehicle highly depend on aerodynamic interaction of multirotor with respect to various wind conditions. The present study focuses on performing computational fluid dynamic (CFD) analysis on examining the vortex formation, turbulent regimes, wake region, tip vortex formulation and ground effect.Preliminary flow analysis is performed to determine the angle of attack (AoA) and wind speed on which minimal drag is experienced by the amphibious structure. Further, analysis conducted through varying the relative velocity of the vehicle and changing the speed of the propellers. The pressure distribution across the fuselage and rotor surface predicted the stability of the vehicle. The ground effect is examined through varying the clearance between the vehicle and ground surface with respect to a multiplicity of rotor diameter. CFD analysis results suggested that at 5° AoA and 8.3 m/sec the designed amphibious vehicle yielded superior performance characteristics and stability.

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Assessment of CFD methods against experimental flow measurements for helicopter flows

Cited by 52 publications

References 14 publications

Linear Reduced-Order Model for Unsteady Aerodynamics of an L-Shaped Gurney Flap

Linear Reduced-Order Model for Unsteady Aerodynamics of an L-Shaped Gurney Flap

Computational Actuator Disc Models for Wind and Tidal Applications

Aerodynamic Interaction Studies on Amphibious Vehicle in Forward and Hovering Flight

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