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A Free-Wake, Lifting-Surface Model Using Distributed Vorticity Elements
22nd Applied Aerodynamics Conference and Exhibit, 2004A higher-order, lifting-surface method is presented that uses elements whose streamwise vorticity is distributed on a vortex sheet that lays vortex filaments, each having the transverse vorticity concentrated along its length, that form the leading and trailing edges of each element.
Bramesfeld, G. +2 more
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CFD-CSD method for rotor aeroelastic analysis with free wake model
Aircraft Engineering and Aerospace Technology, 2022Purpose Computational fluid dynamics (CFD)/computational structural dynamics (CSD) coupling analysis is an important method in the research of helicopter aeroelasticity due to its high precision. However, this method still suffers from some problems, such as wake dissipation and large computational cost.
Siwen Wang, Qiyou Cheng
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Aerodynamic Investigation of Hover Using Vortex Ring Wake Model and Free Vortex Wake Model
AIAA SCITECH 2025 ForumModeling rotor inflow and wake dynamics is fundamental to understanding and improving rotorcraft performance. Especially, hover modeling plays an important role in aircraft design, aerodynamic assessments, and the development of control systems for helicopters and eVTOLs.
Öztürk, İldeniz, Sezer Uzol, Nilay
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An unsteady free wake model for aerodynamic performance of cycloidal propellers
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2016A new unsteady three-dimensional aerodynamic performance prediction approach is established to achieve fast and accurate prediction of the unsteady aerodynamics of cycloidal propellers. This model is developed by the coupling of momentum theory, lifting-line method, free wake model, and the Leishman–Beddoes semi-empirical dynamic stall model.
Jiwei Tang, Yu Hu, Bifeng Song, Hui Yang
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Unsteady Wake Simulation of Wind Turbines Using the Free Vortex Wake Model
Energy, Environmental & Sustainable Ecosystem Development, 2015Bo-Feng Xu, Yue Yuan, Tong-Guang Wang
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Validation of a State-Space Free Wake Model with a Near-Wake Vortex Lattice Model
Proceedings of the Vertical Flight Society 81st Annual Forum and Technology DisplayThis paper presents the implementation and validation of a state-space free-vortex wake model with a vortex lattice near-wake formulation, developed for rotorcraft applications. The model is expressed in state-variable form as a nonlinear time-periodic (NLTP) system in first-order structure, enabling linearization and simplification through ...
Batin Bugday +3 more
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Rotor free-wake modeling using a pseudoimplicit relaxation algorithm
Journal of Aircraft, 1995A pseudoimplicit predictor-cor rector relaxation algorithm with five-point central differencing in space has been developed for the solution of the governing differential equations of the helicopter rotor free-wake problem. This new approach is compared and contrasted with more conventional explicit-type free-wake algorithms.
Ashish Bagai, J. Gordon Leishman
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Proceedings of the Vertical Flight Society 80th Annual Forum
This paper describes the implementation and linearization of a state-space free-vortex wake model with a near-wake vortex lattice model as applied to a helicopter rotor. Following a detailed mathematical description, the wake model is implemented for a blade element model of a utility helicopter rotor and tested in multiple flight conditions ...
Ashish Manjhi +4 more
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This paper describes the implementation and linearization of a state-space free-vortex wake model with a near-wake vortex lattice model as applied to a helicopter rotor. Following a detailed mathematical description, the wake model is implemented for a blade element model of a utility helicopter rotor and tested in multiple flight conditions ...
Ashish Manjhi +4 more
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A free wake vortex model for floating wind turbine aerodynamics
2021In order to significantly increase the share of wind energy produced worldwide, wind energy technology is moving from onshore to offshore and from shallow water to deep water. Floating offshore wind turbines (FOWTs) are expected to be economically better than bottom-mounted turbines when placed in water deeper than 60 metres.
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Application of a free vortex wake model to a horizontal axis wind turbine
Journal of Wind Engineering and Industrial Aerodynamics, 1992Abstract A theoretical model is applied to the rotor aerodynamics of a horizontal axis twin-bladed wind turbine. The model combines a vortex lattice representation of the flow over the blade with a free vortex near wake which is iteratively relaxed into the local flow direction.
F.J. Simoes, J.M.R. Graham
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