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Qing Xiao

Bio: Qing Xiao is an academic researcher from University of Strathclyde. The author has contributed to research in topics: Turbine & Computational fluid dynamics. The author has an hindex of 23, co-authored 129 publications receiving 1952 citations. Previous affiliations of Qing Xiao include Tsinghua University & University of Edinburgh.


Papers
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Journal ArticleDOI
TL;DR: An overview of the state-of-the-art investigations on the recently developed oscillating foil energy converters is presented in this article, where a summary of available knowledge and up-to-date progress in the application of such bio-inspired systems for renewable energy devices is provided.

304 citations

Journal ArticleDOI
TL;DR: In this article, a non-sinusoidal trajectory profile is proposed for the oscillating hydrofoil in the energy generators instead of conventional sinusoidal plunging/pitching motions to seek better energy extraction performance.

159 citations

Journal ArticleDOI
TL;DR: In this article, a numerical tool based on the open source CFD toolbox OpenFOAM for FSI application to FOWTs is described, and various benchmark cases are first modelled to demonstrate the capability of the tool.

138 citations

Journal ArticleDOI
TL;DR: The simulation results show that the flexible structure of a wing is beneficial to enhance power efficiency by increasing the peaks of lift force over a flapping cycle, and tuning the phase shift between force and velocity to a favourable trend.
Abstract: Previous research on the flexible structure of flapping wings has shown an improved propulsion performance in comparison to rigid wings. However, not much is known about this function in terms of power efficiency modification for flapping wing energy devices. In order to study the role of the flexible wing deformation in the hydrodynamics of flapping wing energy devices, we computationally model the two-dimensional flexible single and twin flapping wings in operation under the energy extraction conditions with a large Reynolds number of 106. The flexible motion for the present study is predetermined based on a priori structural result which is different from a passive flexibility solution. Four different models are investigated with additional potential local distortions near the leading and trailing edges. Our simulation results show that the flexible structure of a wing is beneficial to enhance power efficiency by increasing the peaks of lift force over a flapping cycle, and tuning the phase shift between force and velocity to a favourable trend. Moreover, the impact of wing flexibility on efficiency is more profound at a low nominal effective angle of attack (AoA). At a typical flapping frequency f * = 0.15 and nominal effective AoA of 10°, a flexible integrated wing generates 7.68% higher efficiency than a rigid wing. An even higher increase, around six times that of a rigid wing, is achievable if the nominal effective AoA is reduced to zero degrees at feathering condition. This is very attractive for a semi-actuated flapping energy system, where energy input is needed to activate the pitching motion. The results from our dual-wing study found that a parallel twin-wing device can produce more power compared to a single wing due to the strong flow interaction between the two wings.

104 citations

Journal ArticleDOI
TL;DR: In this paper, Lee et al. investigated the flow of the BauerGarabedianKorn No. 1 supercritical airfoil by the solution of the unsteady Reynolds-averaged NavierStokes equations with a two-equation lagged kωturbulent model.
Abstract: The flow of the BauerGarabedianKorn (BGK) No. 1 supercritical airfoil is investigated by the solution of the unsteady Reynolds-averagedNavierStokes equations with a two-equation lagged kωturbulent model.Two steady cases (M=0.71, α=1.396 deg and M=0.71, α=9.0 deg) and one unsteady case (M=0.71, α=6.97 deg), all with a far-stream Reynolds number of 20106, are computed. The results are compared with available experimental data. The computed shock motion and the evolution of the concomitant flow separation are examined. Space-time correlations of the unsteady pressure field are used to calculate the time for pressure waves to travel downstream within the separated region from the shock wave to the airfoil trailing edge and then back from the trailing edge to the shock outside the separated region. The reduced frequency so calculated agrees well with the computed buffet frequency, supporting the signal propagation mechanism for buffet proposed by Lee (Lee, B. H. K., Oscillation Shock Motion Caused by Transonic Shock Boundary-Layer Interaction, AIAA Journal, Vol. 28, No. 5, 1990, pp. 942944).

99 citations


Cited by
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Book ChapterDOI
01 Jan 1997
TL;DR: The boundary layer equations for plane, incompressible, and steady flow are described in this paper, where the boundary layer equation for plane incompressibility is defined in terms of boundary layers.
Abstract: The boundary layer equations for plane, incompressible, and steady flow are $$\matrix{ {u{{\partial u} \over {\partial x}} + v{{\partial u} \over {\partial y}} = - {1 \over \varrho }{{\partial p} \over {\partial x}} + v{{{\partial ^2}u} \over {\partial {y^2}}},} \cr {0 = {{\partial p} \over {\partial y}},} \cr {{{\partial u} \over {\partial x}} + {{\partial v} \over {\partial y}} = 0.} \cr }$$

2,598 citations

Journal ArticleDOI
TL;DR: An overview of the state-of-the-art investigations on the recently developed oscillating foil energy converters is presented in this article, where a summary of available knowledge and up-to-date progress in the application of such bio-inspired systems for renewable energy devices is provided.

304 citations

Journal ArticleDOI
TL;DR: In this paper, the role of a number of parameters, including foil kinematics (modes, frequencies, amplitudes and time histories of motion), foil and system geometry (shape, configuration and structural flexibility), and flow physics effects (Reynolds number and turbulence, shear flows and ground effect), were investigated.

281 citations

DatasetDOI
TL;DR: In this article, structural vibrations caused by a flowing fluid were investigated and it was shown that whenever a structure is exposed to a flowing liquid, it will vibrate and vibrate strongly.
Abstract: Structural vibrations caused by a flowing fluid. Whenever a structure is exposed to a flowing fluid,…

279 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide an up-to-date review on several latest advancements related to particle methods with applications in coastal and ocean engineering and highlight the future perspectives for further enhancement of applicability and reliability of particle methods for coastal/ocean engineering applications.
Abstract: The article aims at providing an up-to-date review on several latest advancements related to particle methods with applications in coastal and ocean engineering. The latest advancements corresponding to accuracy, stability, conservation properties, multiphase multi-physics multi-scale simulations, fluid-structure interactions, exclusive coastal/ocean engineering applications and computational efficiency are reviewed. The future perspectives for further enhancement of applicability and reliability of particle methods for coastal/ocean engineering applications are also highlighted.

245 citations