CFD validation and grid sensitivity studies of full scale ship self propulsion

• Published in: International journal of naval architecture and ocean engineering Vol. 11; no. 1; pp. 33 - 43
• Main Authors: Jasak, Hrvoje, Vukčević, Vuko, Gatin, Inno, Lalović, Igor
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2019; Elsevier; 대한조선학회
• Subjects: Actuator disc; Full scale ship propulsion; Grid sensitivity studies; OpenFOAM; Sea trial validation; 조선공학; OpenFOAM; Grid sensitivity studies; Actuator disc; Sea trial validation; Full scale ship propulsion
• ISSN: 2092-6782; 2092-6790
• DOI: 10.1016/j.ijnaoe.2017.12.004

A comparison between sea trial measurements and full–scale CFD results is presented for two self–propelled ships. Two ships considered in the present study are: a general cargo carrier at Froude number Fn=0.182 and a car carrier at Fn=0.254. For the general cargo carrier, the propeller rotation rate is fixed and the achieved speed and trim are compared to sea trials, while for the car carrier, the propeller rotation rate is adjusted to achieve the 80% MCR. In addition, three grids are used for each ship in order to assess the grid refinement sensitivity. All simulations are performed using the Naval Hydro pack based on foam-extend, a community driven fork of the OpenFOAM software. The results demonstrate the possibility of using high–fidelity numerical methods to directly calculate ship scale flow characteristics, including the effects of free surface, non–linearity, turbulence and the interaction between propeller, hull and the flow field. •Full scale CFD self propulsion simulations are performed for two ships: a general cargo carrier and a car carrier.•The results are directly compared to sea trials, without any extrapolation procedure.•Three grids are used for both ships to assess the sensitivity of the solution with respect to grid refinement.