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Huang D.-G.,Shanghai University | Huang D.-G.,Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering | Wu G.,Nantong University
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering | Year: 2013

In this article, a new method is presented for simulation of incompressible flow field, which is called Newton iteration based on variational finite element method. Meanwhile, underlying theories and general steps in the solution procedure using this method have been described in detail. In order to validate this method, incompressible simulations on the flowfield around a circular cylinder were conducted. The achieved results were then compared with existing analytic solutions and good agreements have been obtained. In addition, the incompressible flow around an aerofoil was also calculated using both the proposed method and the conventional variational finite element method. It was found that the results obtained by the two methods were exactly the same; however, this proposed method can significantly improve the computational efficiency. © IMechE 2013. Source


Lu H.,Shanghai University | Zhang J.,Shanghai University | Zhang J.,Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering | Fan J.,Alfred University
Guti Lixue Xuebao/Acta Mechanica Solida Sinica | Year: 2011

The mechanical properties and tension deformation of the single-crystalline FCC Cu nanowires are simulated with different orientation under uniaxial tension. The yield and elastic modulus in three different orientations of <100>, <110> and <111> are investigated by the quasi-static classic MD (Molecular dynamics) based on an embedded-atom method potential at room temperature. It is found that nanowires have different mechanical properties when tensioned in different orientations. The yield stress of Cu nanowire is the highest in the <111> orientation, the second in the <100> orientation and the lowest in the <110> orientation; however, the ductility of Cu nanowire is the best in the <100> orientation, but poor in the <111> and <110> orientations. The effective young's moduli of Cu nanowire are markedly different in different crystallographic orientations, i.e. E<111> > E<110>>E<100>. Detailed discussion on the stress-strain relation and underlying deformation mechanism of the nanowires is given, paying more attention to the local dislocation structure evolution and the critical resolved shear stress. Source


Sun X.,Shanghai University | Sun X.,Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering | Huang D.,University of Shanghai for Science and Technology
International Journal of Sustainable Energy | Year: 2014

Shanghai, known as the economic, financial and cultural centre of China, lies in the southern portion of the Yangtze River Basin and is the largest and most prosperous city in mainland China. With a high rate of economic and population growth, Shanghai's demand for energy continues to rise. However, Shanghai is a city with a lack of traditional energy resources, and relies heavily on steady supplies of fossil fuels imported from other regions of China. In order to ensure the optimal use of energy resources and limit the environmental impact, the Shanghai government has launched a new energy strategy and is committed to the development of renewable energy, especially wind power. This paper assesses the wind energy resource in Shanghai, reviews the current status of wind power utilisation, and identifies the major challenges facing the development of a robust wind energy industry in this fastest growing city of China. © 2013 © 2013 Taylor & Francis. Source


Luo D.,Shanghai University | Luo D.,Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering | Huang D.,Shanghai University | Huang D.,Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering | Wu G.,Nantong University
Journal of Renewable and Sustainable Energy | Year: 2011

Instead of using conventional horizontal axis wind turbine blades, a Magnus wind turbine is equipped with rotating cylinders, which rotate around their own axes according to the principle of the Magnus effect. Based on the blade element momentum (or BEM) theory, an analytical analysis of the Magnus wind turbine power performance is conducted and its expression of power coefficient has been derived in this paper. The analytical solution has shown that there is a close relationship between the power coefficient of Magnus wind turbine and its physical parameters such as the tip rotor solidity, the tip speed ratio of Magnus turbine, and the relative speed of the cylinders rotation. In addition, a numerical BEM computation for the power coefficient of Magnus wind turbine is also performed using experimental lift and drag coefficients of a rotating cylinder obtained in the previous literature in order to validate the analytical solution. As a result, the aerodynamic characteristics of Magnus wind turbine observed in this study will be of some guiding significance for the initial research and preliminary design of Magnus wind turbines. © 2011 American Institute of Physics. Source


Sun X.,Shanghai University | Sun X.,Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering | Huang D.,Shanghai University | Huang D.,Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering | Wu G.,Nantong University
Energy | Year: 2012

Wind power has been the fastest growing form of renewable energy for the last few years. According to Intergovernmental Panel on Climate Change (IPCC) report, 80% of the world's energy supply could come from renewable sources by 2050 and wind energy will play a major role in electricity generation in 2050. In the growing market for wind energy and the limited available space onshore, the development of offshore wind farms become more and more important. With a rapid development of technology, the offshore wind power projects have become a trend in many countries like Europe now. Therefore, this paper aims to provide a brief overview of the current development status of offshore wind power in different countries and also explore the technical, economic and environmental issues around its development. Without doubt, offshore wind will lead technology advances in the wind sector in a near future as it seeks to exploit resources further offshore. © 2012 Elsevier Ltd. Source

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