Sarih SARI
(Yıldız Teknik Üniversitesi, Gemi İnşaatı ve Gemi Makineleri Mühendisliği Bölümü, İstanbul, Türkiye)
Ali DOĞRUL
(Milli Savunma Üniversitesi, Deniz Harp Okulu, Gemi İnşaatı ve Gemi Makineleri Mühendisliği Bölümü, İstanbul, Türkiye)
Yıl: 2021Cilt: 27Sayı: 219ISSN: 1300-1973 / 2651-530XSayfa Aralığı: 77 - 95İngilizce

22 0
Verification and Validation of Numerical Simulations of Displacement Type Vessels
It is crucial to reduce the power need and fuel consumption of ships, thus eco−friendly ship design can be achieved. This goal can be achieved with the accurate prediction of the hydrodynamic performance of ships. In this manner, numerical and experimental methods are widely used by many researchers. Experimental studies are based on towing tank tests while the numerical methods are based on viscous and potential flow assumptions. In this study, it is aimed to investigate different types of ship models to provide a comprehensive data set. A numerical approach solving RANS (Reynolds−averaged Navier− Stokes) equations was employed for two container ships and a naval surface combatant to show the precision and accuracy of the numerical method. These vessels are KRISO container ship (KCS), Duisburg test case (DTC) and ONR Tumblehome (ONRT) developed by the Office of Naval Research. The flow around these vessels was investigated by taking the free surface into account. The flow analyses were carried out in calm water conditions and the ships were set to be free to sinkage and trim. For the verification study, the GCI method, which is recommended by ITTC (International Towing Tank Conference) and AIAA (American Institute of Aeronautics and Astronautics), was employed. Fine, medium and coarse cases were generated with different grid sizes and time step sizes. These cases were generated by using a constant refinement ratio (√2). The numerical analyses for the verification purpose were conducted at the design Froude number of each model ship. The uncertainty values were obtained for the total resistance. Following this, a comprehensive validation study was conducted for each ship model in a wide range of Froude numbers, covering low and moderate speeds. The validation was done by comparing the numerical results with the available experimental data. In addition to this, the results were compared with other existing numerical results in the literature. The validation was done in terms of total resistance, sinkage and trim parameters. This study showed that the computational fluid dynamics (CFD) method can sufficiently estimate the ship's hydrodynamic performance. Within these results, when there is a lack of experimental data for comparison, the numerical method is again reliable having low spatial and temporal uncertainty values.
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