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    Thermal analysis of a marine lng tank
    (UBAK Publications, 2021) Cambaz, Alihan; Görgülü, Yasin Furkan; Arat, Halit
    The utilisation of natural gas as a source of energy is gaining popularity. Every year, new reserves are discovered, and there is now considerably more gas being discovered than is being consumed globally. Moreover, new sources are discovered about four times as much gas as it is consumed for every year. However, much of the world's gas reserves are spread out far from major consumption centres. As a result, gas transportation and storage are required. Liquifying the gas at cryogenic temperatures reduces its volume by more than 600 times, making storage and transportation much easier. In this study, thermal analyses were made on the LNG tank on a marine ship (TSR 18009) named “SELVÅG SENIOR” being constructed by SU Ship Design A.Ş. The analyses have been performed as transient-state and the results are projected for 5-day and 10-day time intervals.
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    Two-phase numerical modelling of a wet exhaust system in a catamaran motor yacht diesel engine
    (2021) Cambaz, Alihan; Görgülü, Yasin Furkan; Arat, Halit
    In this study, multiphase temperature distributions and volume fractions through a wet exhaust system were investigated as 3D by using a comprehensive numerical model in a yacht diesel engine. For this purpose, the Volume of Fluid multiphase model was selected as the numerical model. Fuel exhausts are generally located underwater to ensure a modern yacht appearance and minimize exhaust noise. A scoop is positioned above the catamaran yacht exhaust to control water pressure, exhaust gases, and cooling water flow distribution. Besides, two types of fluids have been used, one of which is the hot exhaust gas the other is the cooling water used in the nozzle. The design has been created using Ansys SpaceClaim, and the cooling water is sprayed from the 60° tip of the nozzle. Moreover, the mesh used in the simulation has 1,405,113 elements, 523,125 nodes, and the average mesh skewness is 0.46, the average orthogonal quality of the mesh is 0.64. The Realizable k-ε turbulence model has been used in the simulations. According to the results, the flow fully develops after 1.5 seconds, and the water nozzle sprays the water along the tube cools the exhaust gases. Also, the stagnation points occurring at the elbow fitting of the tube are striking when the velocity contours and velocity vectors are examined.