engleski

Computational fluid dynamics analysis of sea water mixing inside a ballast tank using volume of fluid method

Abstract — Numerical analysis is conducted using Computational Fluid Dynamics (CFD) modelling to investigate different strategies for sea water mixing and species homogenization via bubbling for a commercial-scale sea vessel ballast tank. Mixing of the ballast sea water is achieved by incorporating a novel approach, the internal combustion engine exhaust gases are used instead of inert gases, supplied by the compressors, to suppress the genesis and multiplication of invasive biological organisms inside the ballast sea water tanks. Additionally, the effect of mixing is also investigated as means to minimize the occurrence of sea water freezing inside the ballast tanks while the vessel is cruising in sub-zero atmospheres, achieved by disturbing the free surface of the sea water inside the tanks. One commercially available configuration of the supply pipes is chosen as a reference, and 2D CFD model incorporating Volume of Fluid (VoF) method is developed to study the transient formation and transport of the exhaust gas bubbles inside the ballast tank. Several different design configurations are analysed as well as different bubble mass flow rates to find the most efficient and economically viable solution.

Computational Fluid Dynamics Analysis ; Volume of Fluid Method ; Sea Water Mixing in Ballast Tanks ; Transient Analysis ; Two-Phase Flow

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