Naslov
Grid Type and Turbulence Model Influence on Propeller Characteristics Prediction

Autori
Sikirica, Ante ; Čarija, Zoran ; Kranjčević, Lado ; Lučin, Ivana

Izvornik
Journal of marine science and engineering (2077-1312) 7 (2019), 10; 374, 18

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
open water ; cavitation ; structured grid ; PPTC

Sažetak
This paper evaluates the applicability of the hexahedral block structured grids for marine propeller performance predictions. Hydrodynamic characteristics for Potsdam Propeller Test Case (PPTC), namely thrust and torque coefficients, were determined using numerical simulations in two commercial solvers: Ansys Fluent and STAR-CCM+. Results were attained for hexahedral and tetrahedral hybrid grids equivalent in terms of cell count and quality, and compared to the experimental results. Furthermore, accuracy of Realizable k-ϵ and SST k-ω turbulent models when analyzing marine propeller performance was investigated. Finally, performance characteristics were assessed in cavitating flow conditions for a single advance ratio using Zwart–Gerber–Belamri and Schnerr and Sauer models. The resulting cavitation pattern was compared to cavity extents and shape noted during measurements. The results suggest that hexa and hybrid grids, in certain range of advance ratios, do provide similar results ; however, for low and high ratios, structured grids in conjunction with Realizable k-ϵ model can achieve more accurate results.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo, Temeljne tehničke znanosti

POVEZANOST RADA