Naslov
Numerical characterisation of a ship propeller

Autori
Šeb, Borna

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
31.03

Godina
2017

Stranica
103

Mentor
Jasak, Hrvoje

Ključne riječi
CFD, OpenFOAM, JBC Propeller, Open water test, MRF, Actuator Disc

Sažetak
Due to the rapid development of computer technology Computational Fluid Dynamics (CFD) have become a viable tool for hydrodinamic analysis of ship propellers. The open water test for the propeller, traditionally performed to obtain the characteristics used in design, is often simulated with the CFD methods. In this thesis three different CFD methods for simulating the open water test are evaluated based on their accuracy and computational time. They are respectively: • multiple frames of reference (MRF) for a single blade passage with periodic boundary conditions, • MRF for complete propeller geometry, • transient simulation with a rotating mesh and complete propeller geometry. For some naval applications the interaction between the propeller and ship flows has to be resolved correctly. Solving the flow around the exact propeller geometry in such simulations can be extremely demanding in terms of CPU requirements, which sometimes makes them unfeasible. As an alternative, it is preferred to define an actuator disc region at the location of the propeller at which the momentum transferred from the propeller to the fluid is modelled. In this thesis the open water characteristics from the resolved propeller geometry are used for modelling the propeller influence on the flow with the actuator disc approach. The performance of the actuator disc is afterwards evaluated against the CFD results for the actual propeller geometry.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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