The Experts below are selected from a list of 1815 Experts worldwide ranked by ideXlab platform
Hassan Saghi - One of the best experts on this subject based on the ideXlab platform.
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A new arrangement with nonlinear sidewalls for Tanker ship storage panels
Journal of Ocean University of China, 2013Co-Authors: Mohammad Javad Ketabdari, Hassan SaghiAbstract:Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in Tanker Ships and Liquefied Natural Gas (LNG) carriers. When the tank in these vehicles is partially filled, it is essential to be able to evaluate the fluid dynamic loads on tank perimeter. Different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have been suggested for ship storage tanks by previous researchers. In this paper a numerical model is developed based on incompressible and inviscid fluid motion for the liquid sloshing phenomenon. The coupled BEM-FEM is used to solve the governing equations and nonlinear free surface boundary conditions. The results are validated for rectangular container using data obtained for a horizontal periodic sway motion. Using the results of this model a new arrangement of trapezoidal shapes with quadratic sidewalls is suggested for Tanker ship storage panels. The suggested geometric shape not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing effects more efficiently than the existing geometric shapes.
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A new arrangement with nonlinear sidewalls for Tanker ship storage panels
Journal of Ocean University of China, 2013Co-Authors: Mohammad Javad Ketabdari, Hassan SaghiAbstract:Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in Tanker Ships and Liquefied Natural Gas (LNG) carriers. When the tank in these vehicles is partially filled, it is essential to be able to evaluate the fluid dynamic loads on tank perimeter. Different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have been suggested for ship storage tanks by previous researchers. In this paper a numerical model is developed based on incompressible and inviscid fluid motion for the liquid sloshing phenomenon. The coupled BEM-FEM is used to solve the governing equations and nonlinear free surface boundary conditions. The results are validated for rectangular container using data obtained for a horizontal periodic sway motion. Using the results of this model a new arrangement of trapezoidal shapes with quadratic sidewalls is suggested for Tanker ship storage panels. The suggested geometric shape not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing effects more efficiently than the existing geometric shapes.
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Numerical simulation of sloshing in rectangular storage tank using coupled FEM-BEM
Journal of Marine Science and Application, 2012Co-Authors: Hassan Saghi, Mohammad Javad KetabdariAbstract:Sloshing of liquid can increase the dynamic pressure on the storage sidewalls and bottom in Tanker Ships and LNG careers. Different geometric shapes were suggested for storage tank to minimize the sloshing pressure on tank perimeter. In this research, a numerical code was developed to model liquid sloshing in a rectangular partially filled tank. Assuming the fluid to be inviscid, Laplace equation and nonlinear free surface boundary conditions are solved using coupled FEM-BEM. The code performance for sloshing modeling is validated against available data. To minimize the sloshing pressure on tank perimeter, rectangular tanks with specific volumes and different aspect ratios were investigated and the best aspect ratios were suggested. The results showed that the rectangular tank with suggested aspect ratios, not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing pressure efficiently.
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numerical simulation of sloshing in rectangular storage tank using coupled fem bem
Journal of Marine Science and Application, 2012Co-Authors: Hassan Saghi, Mohammad Javad KetabdariAbstract:Sloshing of liquid can increase the dynamic pressure on the storage sidewalls and bottom in Tanker Ships and LNG careers. Different geometric shapes were suggested for storage tank to minimize the sloshing pressure on tank perimeter. In this research, a numerical code was developed to model liquid sloshing in a rectangular partially filled tank. Assuming the fluid to be inviscid, Laplace equation and nonlinear free surface boundary conditions are solved using coupled FEM-BEM. The code performance for sloshing modeling is validated against available data. To minimize the sloshing pressure on tank perimeter, rectangular tanks with specific volumes and different aspect ratios were investigated and the best aspect ratios were suggested. The results showed that the rectangular tank with suggested aspect ratios, not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing pressure efficiently.
Mohammad Javad Ketabdari - One of the best experts on this subject based on the ideXlab platform.
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A new arrangement with nonlinear sidewalls for Tanker ship storage panels
Journal of Ocean University of China, 2013Co-Authors: Mohammad Javad Ketabdari, Hassan SaghiAbstract:Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in Tanker Ships and Liquefied Natural Gas (LNG) carriers. When the tank in these vehicles is partially filled, it is essential to be able to evaluate the fluid dynamic loads on tank perimeter. Different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have been suggested for ship storage tanks by previous researchers. In this paper a numerical model is developed based on incompressible and inviscid fluid motion for the liquid sloshing phenomenon. The coupled BEM-FEM is used to solve the governing equations and nonlinear free surface boundary conditions. The results are validated for rectangular container using data obtained for a horizontal periodic sway motion. Using the results of this model a new arrangement of trapezoidal shapes with quadratic sidewalls is suggested for Tanker ship storage panels. The suggested geometric shape not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing effects more efficiently than the existing geometric shapes.
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A new arrangement with nonlinear sidewalls for Tanker ship storage panels
Journal of Ocean University of China, 2013Co-Authors: Mohammad Javad Ketabdari, Hassan SaghiAbstract:Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in Tanker Ships and Liquefied Natural Gas (LNG) carriers. When the tank in these vehicles is partially filled, it is essential to be able to evaluate the fluid dynamic loads on tank perimeter. Different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have been suggested for ship storage tanks by previous researchers. In this paper a numerical model is developed based on incompressible and inviscid fluid motion for the liquid sloshing phenomenon. The coupled BEM-FEM is used to solve the governing equations and nonlinear free surface boundary conditions. The results are validated for rectangular container using data obtained for a horizontal periodic sway motion. Using the results of this model a new arrangement of trapezoidal shapes with quadratic sidewalls is suggested for Tanker ship storage panels. The suggested geometric shape not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing effects more efficiently than the existing geometric shapes.
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Numerical simulation of sloshing in rectangular storage tank using coupled FEM-BEM
Journal of Marine Science and Application, 2012Co-Authors: Hassan Saghi, Mohammad Javad KetabdariAbstract:Sloshing of liquid can increase the dynamic pressure on the storage sidewalls and bottom in Tanker Ships and LNG careers. Different geometric shapes were suggested for storage tank to minimize the sloshing pressure on tank perimeter. In this research, a numerical code was developed to model liquid sloshing in a rectangular partially filled tank. Assuming the fluid to be inviscid, Laplace equation and nonlinear free surface boundary conditions are solved using coupled FEM-BEM. The code performance for sloshing modeling is validated against available data. To minimize the sloshing pressure on tank perimeter, rectangular tanks with specific volumes and different aspect ratios were investigated and the best aspect ratios were suggested. The results showed that the rectangular tank with suggested aspect ratios, not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing pressure efficiently.
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numerical simulation of sloshing in rectangular storage tank using coupled fem bem
Journal of Marine Science and Application, 2012Co-Authors: Hassan Saghi, Mohammad Javad KetabdariAbstract:Sloshing of liquid can increase the dynamic pressure on the storage sidewalls and bottom in Tanker Ships and LNG careers. Different geometric shapes were suggested for storage tank to minimize the sloshing pressure on tank perimeter. In this research, a numerical code was developed to model liquid sloshing in a rectangular partially filled tank. Assuming the fluid to be inviscid, Laplace equation and nonlinear free surface boundary conditions are solved using coupled FEM-BEM. The code performance for sloshing modeling is validated against available data. To minimize the sloshing pressure on tank perimeter, rectangular tanks with specific volumes and different aspect ratios were investigated and the best aspect ratios were suggested. The results showed that the rectangular tank with suggested aspect ratios, not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing pressure efficiently.
Radu Hanzu-pazara - One of the best experts on this subject based on the ideXlab platform.
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Study of VLCC Tanker ship damage stability during off-shore operation
IOP Conference Series: Materials Science and Engineering, 2016Co-Authors: Radu Hanzu-pazara, Paulica Arsenie, A Duse, C VarsamiAbstract:Today, for the carriage of crude oil on sea are used larger Tanker Ships, especially from VLCC class. The operation of this type of Ships requires in many cases special conditions, mainly related to water depth in the terminal area and enough maneuvering space for entrance and departure. Because, many ports from all over the world don't have capacity to operate this type of Ships inside, in designed oil terminal, have chosen for development of outside terminals, off-shore oil terminals. In case of this type of terminals, the problems of water depth and manoeuvring space are fixed, but other kind of situations appears, regarding the safety in operation and environment factors impact on ship during mooring at oil transfer buoy. In the present paper we intend to show a study made using simulation techniques about VLCC class Tanker ship in case of a damage condition resulted after a possible collision with another ship during loading operation at an off-shore terminal. From the beginning, we take in consideration that the ship intact stability, during all loading possible situations, has to be high enough, so that in case of some damage with flooding of different compartments due to hypothetical dimension water hole, the ship stability in the final stage of flooding to correspond to the requirements for damage stability and, also, to complementary requirements for damage ship stability.
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The Offshore Petroleum Terminals Impact on the Marine Environment
Journal of marine technology and environment, 2009Co-Authors: Radu Hanzu-pazaraAbstract:In recent years, Tanker Ships have been expanded to over 500,000 tons, imposing the development of new operational capacities on offshore terminals. This aspect has necessitated the creation of new terminals outside of port areas in the open seas, allowing for the receiving of much larger Ships. This open sea positioning carries the risk of causing environmental damage much greater than that posed by port terminals. With these facts in mind, this paper presents some aspects of the potential impacts on the marine environment of offshore petroleum terminals.
Antonio Boccalatte - One of the best experts on this subject based on the ideXlab platform.
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Allocating crude oil supply to port and refinery tanks: a simulation-based decision support system
Decision Support Systems, 2002Co-Authors: Massimo Paolucci, Roberto Sacile, Antonio BoccalatteAbstract:Abstract This work focuses on the problem of allocating the crude oil loads of Tanker Ships to port and refinery tanks (PRT). Two discrete scheduling aspects mainly influence this process: the Tankers' arrivals and the sequence of crude lots processed in the refinery. A simulation-based approach that can be applied as a simulator of the physics of the crude oil flow in the refinery system, as a learning support for personnel training, and as a decision support system (DSS) is proposed. The results of the application of the implemented system on a real small–medium-sized refinery system are presented.
Kyu-yeul Lee - One of the best experts on this subject based on the ideXlab platform.
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Knowledge-based nonmonotonic reasoning process in ship compartment design system
Expert Systems with Applications, 1997Co-Authors: Kyung-ho Lee, Kyu-yeul LeeAbstract:Abstract Recently marine pollution has been a hot issue in shipbuilding fields especially in the design of crude oil Tanker Ships. There are many significant constraints to be considered at the design stage. In this paper, an expert system to support compartment design of a crude oil Tanker is developed so as to treat many of the constraints and design changes according to their conflicts effectively. The nonmonotonic reasoning concept helps a designer to perform his/her design in spite of complicated and cross-related design constraints. In addition, this system focuses on the integration of the knowledge base, database, case base, and CAE programs, hence reliable solutions can be assured. The validation of the system was examined and verified by applying the system to the 250,000 ton crude oil Tanker.
