High performance racing shells for international and Olympic rowing competitions over the years have varied slightly in length and breadth but have largely remained a very similar hull shape. Majority of studies have explored the biomechanics of rowing technique and the effectiveness of the oars through the water. There is still a lack of research into the optimal shell form and operation condition in terms of weight distribution. Given that many rowing races are won by less than a second. Therefore, the aim of this paper is to use experimental and Computational Fluid Dynamics (CFD) methods to investigate the optimal trim for an eights racing shell over a 2000m race. A computational model is produced and compared with model tests to assess its accuracy. Trim optimization of the model shell was performed at an average speed and the varying velocities of realistic rowing motion were excluded. Comparing the results with the reference result (zero trim condition) reveals the reduction in resistance obtained and hence demonstrate the difference in the effort the crew would have to make to maintain the same speed.

Around 90% of global trade is carried through the international shipping industry. This rate is the most important indication that the maritime sector has an important share in the world trade. With the increase in trade volume, new ships will be included in the system, more fuel will be consumed and more emissions will be released. For this reason, the International Maritime Organization (IMO) draws attention to the energy efficiency activities on the ships in order to reduce their adverse effects, identifying the energy-saving potentials and encourages the sector in this regard. In this study, the use of renewable energy sources such as solar and wind energy systems and the use of alternative energy sources such as shore-side power applications on ships have been examined to reduce marine fuel consumption and minimize exhaust gas emissions. Current informations about the use of alternative energy systems in the ship technology have been given. Moreover, it is aimed to contribute to the future predictions of the maritime sector representatives by mentioning the new generation ship designs and projects.

In this study, it is aimed to analyze the occupational health and safety in confined spaces in shipbuilding industry. Confined spaces in new construction, repair and maintenance are summarized and the risks are analyzed. In national and international legislations, regulations related to occupational health and safety are briefly mentioned. A specific confined space accident example were analyzed by using the Formal Safety Assessment method to identify the determinants of reducing risk factors.

Semi-submersible off-shore rigs are widely operated in offshore oil and gas industry, especially it serves the purpose of drilling, exploration, installation and accommodation purposes. It is designed for operating in deep waters and harsh environments. Fatigue damage is known as one of the unavoidable problems for offshore steel structures. Depending on the design type; a semi-submersible hull structure consists of connections that are prone to fatigue damage. Fatigue analyses should be carried out during the design stage so that the hull structure can have an adequate fatigue life. The main objective of this study is to calculate global fatigue damage and confirm the adequacy of the deepwater semi-submersible rig for 40 ~ 400 years life, where the structural components with respective design fatigue factors are accounted for. The results and insights derived from the present study are summarized and discussed.

Offshore units are known as complex facilities that can lead to serious impacts and losses, such as human lives, environmental disasters and the complete loss of the structure. In addition, since the cost associated to their construction and maintenance is very high, it is important to keep them fully operational throughout their whole service life. In this study, an impact analysis is performed that the loads arising when a vertical pile strikes against the side of a semisubmersible pontoon structure. Two cases are being investigated, such as one plane impact case with the vertical pile parallel to the pontoon side and one tilted platform case with a small angle between the vertical pile and the pontoon side. The results and insights developed from the present work are summarized.