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energy-waves
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Numerical investigation of distance effect between two searasers for hydrodynamic performance
, Article Alexandria Engineering Journal ; Volume 55, Issue 3 , 2016 , Pages 2257-2268 ; 11100168 (ISSN) ; Jafari, M ; Hafezi Sefat, P ; Sharif University of Technology
Elsevier B.V
2016
Abstract
Nowadays, researchers are interested in investigation of the ocean wave energy conversion (OWEC) because this device can convert wave energy into electricity economically. The aim of this study was to evaluate a novel ocean wave energy converter named Searaser which may be capable of being used in the Caspian Sea. One of the ways for improving the efficiency of Searasers is to use numerous Searasers simultaneously. Increasing the number of Searasers not only increases the electricity production but also can help producing more stable electricity. In this article the function of two Searasers three different distances (10, 15 and 20 m) was evaluated numerically by solving momentum and...
Energy management through topology optimization of composites microstructure using projected gradient method
, Article Structural and Multidisciplinary Optimization ; Volume 52, Issue 6 , December , 2015 , Pages 1121-1133 ; 1615147X (ISSN) ; Tavakoli, R ; Bagheri, R ; Sharif University of Technology
Springer Verlag
2015
Abstract
In this paper the projected gradient method is applied as an effective gradient-based topology optimization algorithm in order to direct energy propagation through the desired region of composites microstructure. Rayleigh Damping model is also used in order to take the effect of internal damping mechanisms into account and thus, to fill in the gap between the designed layouts and those in reality. The success of the proposed algorithm is illustrated through several numerical experiments by revealing a set of various designed optimal layouts besides their corresponding energy distributions
Energy Management through Topology Optimization of Microstructure of Tow Phase Functionally Graded Materials (FGMs) under Dynamic Loading
, M.Sc. Thesis Sharif University of Technology ; Bagheri, Reza (Supervisor) ; Tavakoli, Rouhollah (Co-Advisor)
Abstract
A numerical algorithm is proposed to design microstructure of a two-phase functionally graded material under dynamic loading. In order to direct energy propagation through the desired regions in the domain, we introduced a regularized Heaviside function, H(x), in our objective functional, namely the time-averaged sum of the elastic strain energy and the kinetic energy. Real-life systems are however, not undamped, but possess some kind of energy dissipation mechanism or damping. In order to apply modal analysis of undamped systems to damped systems, we use Rayleigh damping model in our formulations. To generate a well-posed topology optimization, we used homogenization via a solid isotropic...
Laboratory investigations on impulsive waves caused by underwater landslide
, Article Coastal Engineering ; Volume 55, Issue 12 , December , 2008 , Pages 989-1004 ; 03783839 (ISSN) ; Najafi Jilani, A ; Sharif University of Technology
2008
Abstract
Laboratory investigations have been performed on the submarine landslide generated waves by performing 120 laboratory tests. Both rigid and deforming-slide masses are considered. The effects of bed slope angle, initial submergence, slide geometry, shape and deformation on impulse wave characteristics have been inspected. Impulse wave amplitude, period, energy and nonlinearity are studied in this work. The effects of bed slope angle on energy conversion from slide into wave are also investigated. Laboratory-based prediction equations are presented for impulse wave amplitude and period in near and far-field and are successfully verified using the available data in previous laboratory and...
On the effects of landslide deformability and initial submergence on landslide-generated waves
, Article Landslides ; Volume 16, Issue 1 , 2019 , Pages 37-53 ; 1612510X (ISSN) ; Ataie Ashtiani, B ; Sharif University of Technology
Springer Verlag
2019
Abstract
This paper represents a numerical study on the effects of landslide initial submergence and its geotechnical and rheological properties on the characteristics of landslide-generated waves (LGWs) and landslide deformation. A number of 117 numerical experiments are performed using a two-layer Coulomb Mixture Flow (2LCMFlow) model on a real-sized numerical flume as a simplified cross section of the Maku dam reservoir, located in the Northwest of Iran. Three different initial locations are considered for landslide representing a subaerial (SAL), a semi-submerged (SSL), and a submarine (SML) landslide. Based on the numerical results, the majority of SMLs and in some cases SSLs generate tsunami...