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Numerical Analysis of the Armour Layer Stability in Rubble-Mound Breakwaters
, M.Sc. Thesis Sharif University of Technology ; Pak, Ali (Supervisor)
Abstract
Rubble-mound breakwaters are one of the most customary breakwaters, which make a calm and safe area for ships to berth. To protect these structures from sea wave attacks, armour layers consisting of rocks or concrete blocks are put on their outer surface. Providing the stability of the armour layer is an important procedure in the design of breakwaters. Until now, design of the armour layer is based on the empirical formulae and physical modeling tests. The current research aims to study the stability of the armour layer by the numerical method and employing the commercial code FLOW-3D. In the present research, the effect of geometrical parameters such as breakwater slope and armour diameter...
Dynamic behavior of a tension leg platform offshore wind turbine under environmental loads
, Article Scientia Iranica ; Vol. 21, issue. 3 , 2014 , pp. 480-491 ; ISSN : 1026-3098 ; Abbaspour, M ; Nasiri, R. M ; Sharif University of Technology
Abstract
In order to evaluate the dynamic behavior of floating offshore wind turbines, the authors consider two approaches. A numerical method is used to investigate Tension Leg Platform (TLP) offshore wind turbine response behavior under a parked condition. This code considers nonlinearities due to changes in the tension of tethers. The off-diagonal components of stiffness, damping and mass matrices are considered to calculate coupling. This code solves the nonlinear equation of motion at each time step. However, in order to validate the data generated by the code, a scaled-down model was fully tested in the marine laboratory. The importance of these series of experiments is due to the fact that...