Naslov
Decomposition Model for Naval Hydrodynamic Applications. Part I: Computational Method

Autori
Vukčević, Vuko ; Jasak, Hrvoje ; Malenica, Šime

Izvornik
Ocean engineering (0029-8018) 121 (2015); 37-46

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

Ključne riječi
Solution and domain decomposition; SWENSE; Wave modelling; Implicitly redistanced Level Set; Collocated finite volume method; OpenFOAM

Sažetak
The present paper and its companion present a solution and domain decom- position model for general two–phase, incompressible and turbulent flows en- countered in naval hydrodynamics. The mathematical and numerical model are derived within the framework of polyhedral finite volume method. In- terface capturing is obtained with implicitly redistanced level set method derived from the phase field equation. This approach removes the need to redistance the level set field, thus saving CPU time and increasing numer- ical stability. A modified, Spectral Wave Explicit Navier–Stokes Equations method is introduced and used for wave modelling, where the solution is decomposed into incident and diffracted fields. The incident field is readily available from potential flow theories, and only the diffracted component is solved within the non–linear equation set of the free surface flow model. The domain is decomposed with implicit relaxation zones used to prevent wave reflection by forcing the diffracted fields to vanish in the far–field. A second– order, collocated finite volume method is used to discretise the equations. All equations are solved implicitly, which enables the use of higher Courant- Friedrichs-Lewy numbers compared to explicit scheme. The algorithm is implemented in the CFD software OpenFOAM. Verification and validation of the model is presented in the accompanying paper.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja, Strojarstvo

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