Search for: sea-waves
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    Numerical Modeling of Sediment Transport in Souza Gheshm Island

    , M.Sc. Thesis Sharif University of Technology Amirshaghaghi, Sayeh (Author) ; Raie, Mohammad (Supervisor) ; Ataei Ashtiani, Behzad (Supervisor)
    Complicated theories dominated toward interacting of coastal regions resulted from its nature. Besides of that interference of human activities for acquiring beneficial aspects of shorelines causes environmental considerations to be challenged. One of the main factors for resolving this challenge is to obtain adequate information from hydrodynamic process and sediment regime. In spite of scientific researches that carried out along past three decades for understanding the exact mechanism of along shore sediment transport, it was not fully developed. One of the main reasons of uncertainty for forecasting the sediment regime regarded not exact knowledge of how sediment act in different... 

    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 Ebrahimi, A ; Abbaspour, M ; Nasiri, R. M ; Sharif University of Technology
    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... 

    An EWA framework for the probabilistic-based structural integrity assessment of offshore platforms

    , Article Marine Structures ; Volume 59 , 2018 , Pages 60-79 ; 09518339 (ISSN) Zeinoddini, M ; Yaghubi Namin, Y ; Matin Nikoo, H ; Estekanchi, H ; Kimiaei, M ; Sharif University of Technology
    Elsevier Ltd  2018
    Endurance Wave Analysis (EWA) is a novel, simple, economical but yet reliable method for the integrity assessment of offshore platforms against extreme irregular waves. The current paper presents a framework for the probabilistic assessment of offshore platforms based on EWA. The stochastic nature and the uncertainties in the ocean waves were taken into account by introducing a set of artificial, random and gradually intensifying wave trains. To simulate other uncertainties in the loading and the strength of the structure a Latin Hypercube Sampling (LHS) type of Monte Carlo Simulation (MCS) was employed. The EWA methodology and different structural performance criteria were considered. The... 

    Numerical Modeling of Waves Generated by Tropical Cyclone and its Effects on Oman Sea

    , M.Sc. Thesis Sharif University of Technology Taeb, Peyman (Author) ; Abbaspour Tehrani Fard, Majid (Supervisor)
    Sea and ocean waves develop in various ways especially by blowing wind over them. Modeling of these waves has been in center of interest for half a century. After the pioneering study of Gelchi et al (1995), ocean wave models are generally base on a spectral energy or action balance equation. Ocean storms such as tropical cyclone will develop if the atmospheric and oceanic conditions are available. Their Rotational and transition movement causes different patterns of waves. In 2007, cyclone Gonu, a tropical cyclone that formed in Indian ocean and have steered to Oman Sea and also caused damages and casualties in southern coast of Iran. Since intense tropical cyclones such as Gonu have... 

    Numerical Analysis of the Armour Layer Stability in Rubble-Mound Breakwaters

    , M.Sc. Thesis Sharif University of Technology Sarfaraz, Mohammad (Author) ; Pak, Ali (Supervisor)
    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... 

    Numerical Study of the Floating Oscillating Surge Wave Energy Converter Using the Boundary Element Method

    , M.Sc. Thesis Sharif University of Technology Taghipour, Haniyeh (Author) ; Raie, Mohammad (Supervisor)
    Energy production from fossil fuels such as oil and gas is one of the non-renewable energies, which causes many environmental problems such as global warming and environmental pollution. The existence of these problems has led to agreements such as the Glasgow Environmental Agreement, which obligates governments to apply methods to reduce the production of greenhouse gases, which include reducing the consumption of fossil fuels and increasing the use of renewable energy. Sea wave energy is one of the renewable energies that can be used to generate electricity. In the seas of Iran, including the Caspian Sea, Persian Gulf and Oman, there are sources of wave energy that can be used and are... 

    Modeling of forced vibration of marine structural systems under dynamic loads of sea waves

    , Article 18th Australasian Coastal and Ocean Engineering Conference 2007, COASTS 2007 and the 11th Australasian Port and Harbour Conference 2007, PORTS 2007, Melbourne, VIC, 18 July 2007 through 20 July 2007 ; 2007 , Pages 560-565 ; 9781622764280 (ISBN) Jafari, A ; Kanani, A ; Farahani, R. J ; Sharif University of Technology
    Predicting the reaction and function of marine structures towards sea waves, is of significant importance in the design of them. There are some uncertain parameters which can be optimized to increase safety factors as well as to decrease the costs. Knowing the maximum oscillation of marine structures due to dynamic forces will play a great role on structures' safe design. The objective of this paper is to employ a reliable numerical technique to analyze the interaction between marine structures and sea waves. Simulink is an object oriented dynamic simulation package. It can develop new analysis tools aimed at a better understanding and prediction of the physics that governs the behavior of... 

    Iran atlas of offshore renewable energies

    , Article Renewable Energy ; Volume 36, Issue 1 , January , 2011 , Pages 388-398 ; 09601481 (ISSN) Abbaspour, M ; Rahimi, R ; Sharif University of Technology
    The aim of the present study is to provide an Atlas of IRAN Offshore Renewable Energy Resources (hereafter called 'the Atlas') to map out wave and tidal resources at a national scale, extending over the area of the Persian Gulf and Sea of Oman. Such an Atlas can provide necessary tools to identify the areas with greatest resource potential and within reach of present technology development. To estimate available tidal energy resources at the site, a two-dimensional tidally driven hydrodynamic numerical model of Persian Gulf was developed using the hydrodynamic model in the MIKE 21 Flow Model (MIKE 21HD), with validation using tidal elevation measurements and tidal stream diamonds from...