Naslov
Prediction of Local and Integral Self-Propulsion Flow Characteristics Using Dynamic Overset Grid Method

Autori
Đurasević, Sanijo ; Gatin, Inno ; Jasak, Hrvoje

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, prošireni sažetak, znanstveni

Skup
24th Numerical Towing Tank Symposium (NuTTS '22)

Mjesto i datum
Zagreb, Hrvatska, 16.-18.10.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Podatak o recenziji nije dostupan

Ključne riječi
Self-propulsion ; Discretized propeller ; Actuator disc ; Overset Grid ; Level Set

Sažetak
Propulsion characteristics obtained from the model-scale experiments can be extrapolated to full-scale to be used in ship design. Due to different Reynolds (Re) numbers in model and full- scale, it is questionable if propulsion characteristics obtained with extrapolation procedure are adequate to be used in full-scale. Computational Fluid Dynamics (CFD) models based on Reynolds-Averaged Navier-Stokes (RANS) (Jasak, 1996) equations are being used more frequently to describe the ship-propeller interaction (Yilmaz et al., 2020) and to predict the self-propulsion characteristics (Guo et al., 2020). To perform this type of calculations substantial computational resources and a complete set of solver capabilities are necessary, which became possible only recently. This type of high- fidelity calculations can provide insight into local and integral flow phenomena necessary for adequate ship design. Regulations regarding energy efficiency design index of new ships (EEDI), and energy efficiency of existing ships (EEXI) also increase demand for high-fidelity CFD calculations in naval hydrodynamics. Accurate prediction of the self-propulsion characteristics requires adequate modelling of the propeller. A fully-discretized rotating propeller (Castro, Carrica and Stern, 2011) and potential flow-based methods coupled with the RANS solvers (Villa et al., 2019) are probably the most frequently used approaches. Potential flow-based methods are convenient due to it’s efficiency, while a fully discretized rotating propeller method represents the most accurate approach but at the same time less efficient. This work presents a methodology for the prediction of propulsion characteristics with the use of the actuator disc and fully- discretized propeller methods.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja

POVEZANOST RADA