Farhood Azarsina

Islamic Azad University, Science and Research Branch

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Christopher Williams

Virginia Tech

Masoud Torabi Azad

Islamic Azad University North Tehran Branch

Hamed Majidian

Australian Maritime College

Mojtaba Ezam

Islamic Azad University, Science and Research Branch

Neil Bose

Memorial University of Newfoundland

Majid Khazali

Islamic Azad University, Science and Research Branch

Younes Daghigh

Islamic Azad University, Karaj

Habib Hakimzadeh

Sahand University of Technology

Nariman Ashrafi Khorasani

Payame Noor University

Mohammad Daghigh

International Institute of Earthquake Engineering and Seismology

Cooperative Institutions

Islamic Azad University, Science and Research Branch

Islamic Azad University, Tehran

Memorial University of Newfoundland

St. John's University

Sharif University of Technology

University of Manitoba

Isfahan University of Technology

Amirkabir University of Technology

National Research Council Canada

Australian Maritime College

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Aerodynamic Simulation of A Containership to Evaluate Cargo Configuration Effect on Frontal Wind Loads

China Ocean Engineering (2018)

Hamed Majidian Farhood Azarsina

Fuel consumption has always been a matter of concern for ships propulsion. In this research we aim to develop computer models of several containership cargo stacking configurations and discuss an optimal configuration at a constant front wind speed. The paper presents the simulation results by using ANSYS CFX for a 1:4 scale Post- Panamax 9000 TEU containership. The ship is modelled in a cubic domain that contains unstructured mesh with details, in such a way that can demonstrate the influence of the container configuration on wind force. Also the numerical results are verified versus wind tunnel test data. An optimal stack configuration led to about 25% reduction in air resistance. It is proposed that in order to reduce the wind drag force and consequently reduce the fuel consumption and pollutant emissions, empty spaces between the cargo containers and unbalanced cargo distribution over the deck should be inhibited. Also, it is advised to make the cargo distribution on the most forward and aftward deck areas more streamlined.

Offshore geotechnical engineering

10.1007/s13344-018-0021-1

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Citations (9)

Manoeuvring simulation of the MUN Explorer AUV based on the empirical hydrodynamics of axi-symmetric bare hulls

Applied Ocean Research (2010)

Farhood Azarsina Christopher Williams

Towing

Lift (data mining)

10.1016/j.apor.2010.09.003

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Citations (22)

Materials performance assessment of protective layer of rubble mound breakwaters, southern coast of Iran

P. . Atabak S. Allahyaribeik Farhood Azarsina

This study aims to examine the performance of the rock materials in the protective layer of rubble-mound breakwaters in southern Iran, from Rostami Port in Bushehr Province to Beris Port in Sistan and Baluchestan Province. Field inspections were carried out on a great number of rubble-mound breakwaters built in the Persian Gulf and Oman Sea coastal regions to study the protective layer of these breakwaters under ambient conditions as well as to detect the damage caused by factors affecting the failure of the used materials. Subsequently, samples were taken from these rock materials, the specimens were tested in accordance with various quality assessment criteria, and the results were compared with those obtained from international standard tests. The obtained results showed that in most cases, the physical and chemical properties of the local rock materials did not meet standard requirements. As such, these materials are not recommended for use in the construction of breakwaters. In practice, however, these rocks exhibit an acceptable performance in certain cases depending on the position of each rock group in the structure of the breakwater. For this reason, design, construction, and structural considerations can somehow influence the performance of these rock materials in the respective marine structures.

Breakwater

Rubble

Port (circuit theory)

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Small Scale Physical Measurement of Wave Overtopping For Different Shore Protection Structures

International Journal of Maritime Technology (2019)

Farhood Azarsina Aria Pirzadeh Ghasem Darvish

10.29252/ijmt.12.49

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Numerical simulation of container ship in oblique winds to develop a wind resistance model based on statistical data

Journal of International Maritime Safety Environmental Affairs and Shipping (2019)

Hamed Majidian Farhood Azarsina

The forces that wind exerts on a merchant ship, especially for a container ship that carries high stacks of cargo on board, can be very large; therefore, more accurate simulations than presently available in the literature on the aerodynamics of a container ship are necessary for a safe and efficient shipping. This research tries to demonstrate a newer level of accuracy in capturing the aerodynamic properties of a typical full-stack container ship. Simulations setup was verified against US National Advisory Committee for Aeronautics (NACA) test data for the Akron airship. These are unique data that can verify the accuracy of the Computational Fluid Dynamics (CFD) prediction for pressure distributions over a three-dimensional (3D) object in nonzero wind angles. The numerical simulations of the container ship, which have been performed by ANSYS-CFX™, focus on wind angles of attack (AOAs) up to 40°, obtained from a voyage data record of a container ship throughout a rather long voyage. A regression equation for air resistance is derived within this range, and a set of voyage data for wind speed and directions is also analyzed to check the applicability of the results. Innovative features of air–sea interface modeling have been included in this report.

10.1080/25725084.2018.1564471

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Numerical Derivation of Hydrodynamic Forces and Invention of a New Diving Technique for the Batoid Underwater Robot

Marine Technology Society Journal (2016)

Farhood Azarsina Mohammad Shahabadi Arash Shadlaghani

Abstract As part of a design project for a batoid-inspired underwater robot, its dive to a predetermined depth is questioned here. Previously, the vehicle was designed with a streamlined hull shape that resembles a Dasyatis batoid fish, and the fish locomotion was imitated using undulating fins at each side. We did not, however, provide a buoyancy engine or any fins to turn the vessel in the vertical plane and conduct diving maneuvers. We expect to leave the vessel on the water surface, and it dives to a desired depth and then maintains a constant pitch angle and a constant forward speed. A new technique is invented here: the thrust forces of the two fins are shifted off the central top-bottom symmetry plane of the hull, therefore producing a pitching moment on the vessel. An initial trim is also introduced by shifting the center of mass forward the center of buoyancy. Therefore, the vessel is initially bowed down and, by its out-of-plane thrust force, adjusts its pitch attitude. The question is whether a final balance between the thrust force and the hydrodynamic forces will be feasible. The hydrodynamic forces at such forward speeds and attack angles were numerically derived using the computational fluid dynamics powerful software ANSYS-CFX.

Vertical plane

10.4031/mtsj.50.5.7

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Citations (2)

Pure Yaw Experiments on a Series of Hull Forms for an Underwater Vehicle: Hydrodynamic Observations and Analysis

Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies (2007)

Farhood Azarsina Christopher D. Williams Manoj T. Issac

Results from towing tank experiments for pure yaw or zigzag manoeuvres on a series of five axi-symmetric hull forms for an underwater vehicle are reported. The length-to-diameter ratio of the bare-hull version of the underwater vehicle models was in a range of 8.5 to 12.5. The coupled sway-yaw motion for pure yaw manoeuvres resulted in sway amplitudes of up to about six diameters, maximum yaw angles of about 15 degrees, and, a maximum turning rate of 17 deg/s. These manoeuvres resulted in new observations concerning the hydrodynamics of underwater vehicles which are presented in the paper.

Towing

Yaw

Zigzag

10.1109/ut.2007.370769

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Structural analysis of the deck of access bridges in offshore docks under dynamic loading of moving heavy vehicles (Case study: 10 feet concrete deck with prefabricated beam, under the passage of 125-ton bogie)

Farhood Azarsina Nariman Ashrafi Khorasani F Khodadadi

Ports are the most important economic, political and military bottlenecks. This puts shoreline structures (port) in the class of important structures and they have a crucial role in the countries' life. Pile and deck wharf and their access bridges and offshore deck (jetties), are one of the parts which are supplier of coupling between the land and the waterfront. Correct and exact estimation of loads acting on individual structures leads to more accurate and more economical design. To design waterfront deck, it is necessary to estimate the amount of reaction generated in the deck by live loads due to the crossing of the machines over it. To more accurate assessment the effect of moving vehicle passing on the deck, the dynamic analysis is used to calculate the response generated in the deck. The modeling of the vehicle moving on an access bridge of pier piles and deck with the beam element- capturing method, and the D'Alembert and balance principle are used to write the governing differential equation. The deck is also modeled in the form of Euler-Bernoulli beam, with a uniform cross-section. Dynamic load modeling for dynamic analysis of the deck is done by MATLAB program. The main output of this research is to answer the question, that the moving vehicle passing with heavy cargo, with unconventional weight can cause what reactions in the deck? Depending on the type of deck structures and military vehicles, unique results can be obtained including a new deck design, deck strengthen for existing services and changes in specific cargo trailers for safe passing on the deck.

Source

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Searching for the proper deep-water structure for oil and gas developments in the Caspian Sea

Negin Khabiri Farhood Azarsina Masoud Torabi Azad

Existence of oil and gas reservoirs in the Caspian Sea which is deep waters, unlike the Persian Gulf, signifies the requirement of using deep water platforms for drilling and extracting hydrocarbon reservoirs. Design of offshore structures, requires the structural analysis and site investigation. Also needs understanding of complex offshore environment. In this research, by considering the environmental conditions of Caspian Sea with acceptable approximations, practical approach for choosing proper deep-water platform is presented. This includes description of hydrographic data of the Caspian Sea, geotechnical data of the intended locations, significant and maximum wave height with one, 25, 50 and 100 years return period, and dominant wave directions, current speed and direction, and wind conditions. Finally, a semi-submersible platform is proposed as the proper structure.

Hydrocarbon exploration

10.1109/oceans.2014.7003209

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NONLINEAR STATICS ANALYSIS OF ON OFFSHORE JAKET PLATFORM IN THE CASE OF EXPLOSION

Mahla Tajari Farhood Azarsina Nariman Ashrafi Khorasani

Explosion and fire on an offshore rig can lead to its minor or complete damage and sinking which means the loss of life or environmental pollution. Hence the use of techniques such as blast wall is crucial to reduce the detrimental effects. These blast walls are designed for explosion wave of length between 0.1 to 1 of load mainly to protect the personnel and critical sections. In this research, the behavior of an offshore platform jacket under blast wave 0.2 and 0.7of load is studied with the blast wall thickness of 1, 5 and 10 mm. The analysis is performed in both plastic and elastic aspects in which we need to consider the nonlinear geometrical and material properties.

Statics

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Citations (2)