Full-scale unsteady RANS CFD simulations of ship behaviour and performance in head seas due to slow steaming. (15th March 2015)

• Record Type: Journal Article
• Authors: Tezdogan, Tahsin; Demirel, Yigit Kemal; Kellett, Paula; Khorasanchi, Mahdi; Incecik, Atilla; Turan, Osman
• Is Part Of: Ocean engineering. Volume 97(2015)
• Page Start: 186
• Page End: 206
• Publication Date: 2015-03-15
• Subjects: Seakeeping -- CFD -- Fully nonlinear motion simulations -- Added resistance -- Slow steaming -- Full-scale KCS; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2015.01.011
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: It is critical to be able to estimate a ship׳s response to waves, since the resulting added resistance and loss of speed may cause delays or course alterations, with consequent financial repercussions. Slow steaming has recently become a popular approach for commercial vessels, as a way of reducing fuel consumption, and therefore operating costs, in the current economic and regulatory climate. Traditional methods for the study of ship motions are based on potential flow theory and cannot incorporate viscous effects. Fortunately, unsteady Reynolds-Averaged Navier–Stokes computations are capable of incorporating both viscous and rotational effects in the flow and free surface waves. The key objective of this study is to perform a fully nonlinear unsteady RANS simulation to predict the ship motions and added resistance of a full scale KRISO Container Ship model, and to estimate the increase in effective power and fuel consumption due to its operation in waves. The analyses are performed at design and slow steaming speeds, covering a range of regular head waves, using a commercial RANS solver. The results are validated against available experimental data and are found to be in good agreement with the experiments. Also, the results are compared to those from potential theory. Highlights: Full-scale CFD simulations of ship behaviour and performance were performed. RAOs and added resistance were predicted at both design and slow steaming speeds. The increases in effective power due to added resistance were predicted. The benefit of slow steaming was demonstrated. The CFD results were validated against the available experimental data.