Effect of Turbulence Modeling on Hovering Rotor Flows

Yoon, Seokkwan; Chaderjian, Neal M.; Pulliam, Thomas H.; Holst, Terry L.

doi:10.2514/6.2015-2766

Cited by 24 publications

(10 citation statements)

References 6 publications

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“…13(b)). Similar conclusions were drawn in previous work by Kaul et al (23) , Yoon et al (26) , and Sheng et al (27) , where fully turbulent flows were successfully employed. Comparison between predicted and measured (20) FoM at a collective pitch angle of 10° is reported in Table 10.…”

Section: Aerodynamic Study Of Isolated Bladessupporting

confidence: 90%

“…Results with the Spalart-Allmaras (SA) model (25) with the Detached Eddy Simulation (DES) formulation, revealed a lack of agreement with the experiments of Wadcook et al (20) in the laminar-turbulent transitional region. Likewise, Yoon et al (26) investigated the effect of the employed turbulence model on the hovering performance and skin friction coefficients of the XV-15 rotor blade at a collective of 10°. It was found that the k -ω SST-DDES turbulence model predicted the Figure of Merit (FoM) closer to experiment than the SA-DDES one-equation model.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tiltrotor CFD Part I - validation

2017

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This paper presents performance analyses of the model-scale ERICA and TILTAERO tiltrotors and of the full-scale XV-15 rotor with high-fidelity computational fluids dynamics. For the ERICA tiltrotor, the overall effect of the blades on the fuselage was well captured, as demonstrated by analysing surface pressure measurements. However, there was no available experimental data for the blade aerodynamic loads. A comparison of computed rotor loads with experiments was instead possible for the XV-15 rotor, where CFD results predicted the FoM within 1.05%. The method was also able to capture the differences in performance between hover and propeller modes. Good agreement was also found for the TILTAERO loads. The overall agreement with the experimental data and theory for the considered cases demonstrates the capability of the present CFD method to accurately predict tiltrotor flows. In a second part of this work, the validated method is used for blade shape optimisation.

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Section: Aerodynamic Study Of Isolated Bladessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Tiltrotor CFD Part I - validation

2017

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“…This numerical approach and time step was previously validated for similar isolated rotor flows. 4 In order to reduce the computational time required for a converged solution, the first 1,440 steps employ a time step of 2.5 deg, i.e., 10 rotor revolutions. The time step is then reduced to 0.25 deg, when 1,440 steps now correspond to one rotor revolution.…”

Section: Numerical Approachmentioning

confidence: 99%

Computational Analysis of Multi-Rotor Flows

Yoon

Lee²,

Pulliam

2016

54th AIAA Aerospace Sciences Meeting

Self Cite

109

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Interactional aerodynamics of multi-rotor flows has been studied for a quadcopter representing a generic quad tilt-rotor aircraft in hover. The objective of the present study is to investigate the effects of the separation distances between rotors, and also fuselage and wings on the performance and efficiency of multirotor systems. Three-dimensional unsteady Navier-Stokes equations are solved using a spatially 5 th order accurate scheme, dual-time stepping, and the Detached Eddy Simulation turbulence model. The results show that the separation distances as well as the wings have significant effects on the vertical forces of quadroror systems in hover. Understanding interactions in multi-rotor flows would help improve the design of next generation multi-rotor drones.

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“…This numerical approach and time step was previously validated for various rotor flows. [9][10][11][12] In order to reduce the computational time required for a converged solution, the first 1440 steps employ a time step of ∆t = 2.5 • , yielding 10 rotor revolutions. The time step is then reduced to ∆t = 0.25 • , for which 1440 steps correspond to one rotor revolution.…”

Section: B High-order Accurate Navier-stokes Solvermentioning

confidence: 99%

High-Fidelity Computational Aerodynamics of Multi-Rotor Unmanned Aerial Vehicles

Diaz

Yoon

2018

2018 AIAA Aerospace Sciences Meeting

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High-fidelity Computational Fluid Dynamics (CFD) simulations have been carried out for several multi-rotor Unmanned Aerial Vehicles (UAVs). Three vehicles have been studied: the classic quadcopter DJI Phantom 3, an unconventional quadcopter specialized for forward flight, the SUI Endurance, and an innovative concept for Urban Air Mobility (UAM), the Elytron 4S UAV. The three-dimensional unsteady Navier-Stokes equations are solved on overset grids using high-order accurate schemes, dual-time stepping, and a hybrid turbulence model. The DJI Phantom 3 is simulated with different rotors and with both a simplified airframe and the real airframe including landing gear and a camera. The effects of weather are studied for the DJI Phantom 3 quadcopter in hover. The SUI Endurance original design is compared in forward flight to a new configuration conceived by the authors, the hybrid configuration, which gives a large improvement in forward thrust. The Elytron 4S UAV is simulated in helicopter mode and in airplane mode. Understanding the complex flows in multi-rotor vehicles will help design quieter, safer, and more efficient future drones and UAM vehicles.

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Effect of Turbulence Modeling on Hovering Rotor Flows

Cited by 24 publications

References 6 publications

Tiltrotor CFD Part I - validation

Tiltrotor CFD Part I - validation

Computational Analysis of Multi-Rotor Flows

High-Fidelity Computational Aerodynamics of Multi-Rotor Unmanned Aerial Vehicles

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