Sharif Digital Repository

Tsunami, like many other natural disasters leaves people a short time for escape. When talking about Tsunami, the escape time is the period it takes for the wave to start moving from the epicenter, change into a giant wave gradually and reach to a cost. In order to minimize damages of this phenomenon, the escaped time has to be estimated without delay. For this purpose the first needed action is modeling the Tsunami waves. Analytical and numerical models and software that are designed based on them do exist. To have an efficient and rapid Tsunami alarming system all of these options are examined in this project. Then having a reliable model quite a few probable scenarios are propounded. The... 

The thesis title is “Modeling of a vague problem (Floating Breakwater by BEM Analysed) using ANFIS (Adaptive Neuro-Fuzzy Inference System) and validation by Fuzzy Boundary Element Method”. In this set of material, more important definitions are described below. When some input data is linguistics, or we have lack of Information or Vagueness, Fuzzy toolbox can alleviate the problem. Fuzzy concept includes several fields and applications like; fuzzy logic, fuzzy sets, fuzzy control, fuzzy arithmetic and fuzzy inference, and the last two applications are used in this thesis. The Neural network is a black box, Neurons that can justify their actions and these artificial brains can grow. The... 

For more than a million years, aquatic animals and specially fishes make undulatory motions in their flexible body to propel themselves. In the recent decays, scientists prove that these mechanisms are more efficient than man-made propulsion systems. A wide variety of artificial vehicles including robotfishes, ROV and etc has been manufactured with inspiring by natural creatures. The Biomimetic science which deals with the study of mechanics and hydrodynamics of living creatures is very important in developing these vehicles. In the present study, numerical software (PANEL3D®), bases on boundary integral equations of potential flow have been developed to simulate hydrodynamic performance of... 

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... 

The demand in water and energy for household, industrial and agricultural uses continue to grow. In recent years, many researches have been done on thermodynamic assessment and optimization of Combined Cooling, Heating and Power (CCHP) and desalination systems. The interesting and important point is the potential of combining CCHP and desalination systems by employing the solar power. The purpose of this study is exergy analysis and thermoeconomic optimization of a hybrid system of Multi-Effects Distillation desalination (MED) and CCHP, augmented by solar energy. The thermoeconomic analysis is carried out by Total Revenue Requirement (TRR) method. Properties of working fluid in hybrid MED... 

With regards to rapid growth of world population, coastlines have limited natural resources and capacity for human settlement. To tackle the problem the idea of constructing artificial islands could be a solution. Since the artificial islands are semi-enclosed body of water designed to attract not only tourists but also settlements, the flow current pattern and residence time of water should be studied in detail in order to ensure adequate water quality in the surrounding area. In this study, an artificial island is planned to be constructed around Kish Island in Persia Gulf. In this article the effects of different geometries on circulation and residence time of water are investigated... 

Limited fossil resources, daily increase of demand for energy and the most important one that is environmental pollution fact, make people think of renewable energy as a solution. One type of these renewable energies is offshore wind energy that has high potential without any sound and visual noises. Recently a lot of researches have carried out their studies on the topic of offshore wind turbine. Cause of disabling of a lot of software to simulating of dynamic effect of rotating rotors, so in this research has make effort to fabricate and test an offshore wind turbine with different rotor rotating velocities and different heading angle of wind, to catch the effect of these parameter on the... 

Many species in nature exist which human can reach the aims of flying and swimming by inspiring from them. Observations show that fish can use their especial undulating motions of body/fins to crusing, increase performance, suddenly acceleration, and maneuvering. To design a robot fish and benefit the characteristics and abilities of a live fish, using its real geometry and kinematics in the robot is vital. Therefore, simulations are essential to better exploiting the fish behavior, which can obtain useful consequences by using computational fluid dynamics. In this thesis, first the kinematics of sharks is investigated. Then, investigations are accomplished by utilizing an unsteady finite... 

Making money and maintaining the value of assets has always been one of the most important concerns of people. Real estate is one of the essential human needs, but it is also considered an investment tool for individuals. In addition to individuals in a family, various groups and organizations such as policymakers, analysts, banks and financial institutions, taxpayers, and real estate investors are directly or indirectly affected by the dynamic characteristic of the housing market. Therefore, forecasting the exact amount of housing value in the future is very important. Factors that can improve this forecasting's accuracy include considering the relationship between housing value and... 

Given the great potential of energy resources, the utilization of wave energy for electricity production can make a significant contribution to the renewable energy portfolio of coastal nations. There are, however, many challenges that must be overcome in order for wave energy to be commercially viable. One of the key objectives of the wave energy industry today is to produce commercially viable wave farms by placing multiple wave energy converters (WECs) together in an array. The full problem of calculating the power absorbtion of an array of WECs requires not only the complete knowledge of the hydrodynamics of each individual body, but also the scattering and radiation effects between all... 

Underwater robots have found various applications such as military ones, environmental monitoring, oil pipe exploration and surgeries. Design of highly maneuverable robot fish is mostly based on their propulsion mechanism, anatomy of the base fish, highly controllable fins and high propulsion efficiency.
In this research, we design a robot fish by using of experimental results on fish hydrodynamics, flow pattern around the model and various mechanisms of the fish.
In the experimental section, we arranged advanced image processing and optical measurement of DPIV setup in order to reviewing and analyzing movements of two species of fish (trout and Pangasius). The swimming speed of... 

The ocean thermal energy conversion system is one of a variety of renewable marine energy that is made up of a thermodynamic cycle, and it uses the difference between the temperature of hot water at the ocean surface and cold water at the depths of the ocean to generate electricity. The closed cycle is one type in which the system uses a working fluid which its boiling point less than the boiling point of water. Increasing the temperature of the fluid inlet in the cycle increases the system efficiency, which has been applied in this study to increase the efficiency of the OTEC system. The required energy to increase this temperature has been achieved by adding a solar collector to this... 

At high speeds, cavitation bubbles form at the sharp edges of the submerged body or in situations where the pressure falls below the fluid vapor pressure. By placing a suitable cavitator in the nose of the body, the cavitation bubbles are cobined by increasing the speed and the whole body is placed inside the cavity. The formation of a supercavity leads to a significant reduction in the drag force of the vehicle. The submersible device is in contact with the fluid at two points, the cavitator and the fins, and due to the location of the cavitator in the nose of the body, the forces acting on it play an important role in the stability and control of the device.The main goal of current... 

Marine hotels are a new idea in marine industries all over the world. Also, it's not done any targeted and academic research on them in the country even in other countries up to now. For this reason in this project a conceptual design sequence is presented for marine hotels particularly floating hotels. At first, it's presented a complete introduction for modern marine structures such as floating hotels, under water tunnels, marine aquarium and restaurants. Also there is introduction to their working system, environmental conditions, their effeteness on environment and feasibility of their construction. In the following a simple cylindrical model of a floating hotel and its systems are... 

World population is increasing with a rapid paste while the availability of freshwater is becoming more scared. There is a severe lack of fresh water in the world today. Desalination of seawater is one of the significant options in hand to solve this problem. In this research a hybrid solar collector- high efficiency water purification system is introduced which can help to solve this problem with an interesting economic outlook. Renewable energies and desalination plants are two different technologies, which can be combined in various ways. The interface between the renewable energy system and the desalination system is met at the place/subsystem where the energy generated by the renewable... 

For the stability of floating solar PV power plants against environmental forces and the safety of operators during maintenance and repair, the mooring system ought to be designed based on the position of the plant, the size of the plant, and weather conditions. Floating solar PV power plants are mostly located in reservoirs with significant water level variations, or in some cases in inland seas where changes in water level are the most important challenge in their mooring system. In this project, different methods to overcome the water level variations have been studied and finally, a creative idea which covers the weaknesses of previous ones has been represented. By using programming... 

Today, environmental pollution has become a global issue, affecting both land and air, and oceans are no exception. Marine environments increasingly suffer from various forms of chemical and solid pollution, with floating solid waste among the most prevalent forms. Beaches and ports are the main sources of this waste, a significant portion of which is plastic. With the rapid growth in plastic production, concerns about floating waste have intensified globally. Consequently, numerous cultural initiatives and technological solutions have been proposed to combat this pollution. Waste collection systems are among the most effective approaches, and various types have been implemented. Since Iran... 

It has always been a human challenge to inspire natural configurations and phenomena and benefit from their merits in improving the performances of man-made proposed aero/hydro vehicles. For example, the manta rays are known for their great swimming performances. To design and fabricate an underwater robot based on the manta ray geometry and its kinematic characteristics, it is important to initially study its hydrodynamic behavior and possibly arrive at some key design parameters, which can remarkably help to figure out an optimum geometry with high swimming performances. The main objective of this study is to focus on the merits of gliding motion inspired by the manta ray fish considering... 

In the initial part of this research, 10 selected dams out of 647 existing dams in Iran were selected using ArcGIS software, based on 3 indicators of height above sea level, temperature, horizontal solar radiation and wind speed, and the shadow model was calculated by calculating the radiation angle. The solar radiation on the reservoir water level of one of the selected dams, which is Durood Zan Dam, was checked on 4 days of the year. In the next stage, the design of the floating part of the power plant and its related components, in 3 parts including the main door, the door The pontoon and the main pontoon were done. Platform dimensions were optimized during the design process and to... 

In this thesis, the use of jet-engine for oil well fire fighting which is a latest in kind is described and analyzed. For this purpose, more familiarization with this system and some knowledge’s such as hydrodynamics characteristic of nominated area, traditional ways of fire fighting in region, different types of jet engines available type of offshore vessels, type of flame and their characteristic are required, which after studying and analyzing above fields in details, the use of turbojet motors and barge has been chosen for the case to obtain optimum specification os this turbojet motors and required dimensions of barge Some information about oil well shuch as, fluid output, speed rate...