Naslov
Solution and domain decomposition model for marine hydrodynamics: RANS and potential flow coupling

Autori
Vukčević, V. ; Jasak, H. ; Malenica, S.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
MARINE 2015 - Computational Methods in Marine Engineering VI 2015 / Muscari, R. ; Broglia, R. ; Salvatore, F. - : International Center for Numerical Methods in Engineering (CIMNE), 2015, 903-918

ISBN
978-849439286-3

Skup
6th International Conference on Computational Methods in Marine Engineering, MARINE 2015

Mjesto i datum
Rim, Italija, 15.06.2015. - 17.06.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Free surface ; RANS and potential flow coupling ; Solution decompositon ; Wave modelling

Sažetak
This paper presents a CFD decomposition model for free surface, viscous, incompressible flows related to marine hydrodynamics. The solution decomposition is based on Spectral Wave Explicit Navier Stokes Equations (SWENSE), where the primitive variables are written as the combination of incident and diffracted fields. This allows efficient coupling of the discretised Navier-Stokes free surface flow equations with arbitrary potential flow theories. The domain decomposition is achieved with implicit relaxation zones in order to prevent undesirable wave reflection in unbounded domains. Interface capturing is obtained with implicitly redistanced Level Set (LS) method derived from Phase Field equation. This approach removes the need to redistance the LS field using conventional redistancing procedures and reduces mass conservation issues fundamental to the LS method. The numerical model is based on a polyhedral, second-order accurate, collocated finite volume method (FVM). The coupling of primitive variables is obtained via segregated solution algorithm based on SIMPLE and PISO. The model is implemented in OpenFOAM. The verification of the model is performed by a number of two- dimensional (2-D) test cases. The reflection analysis is carried out by changing the relaxation zone length. Mass conservation and preservation of the signed distance LS function is demonstrated with a simulation lasting 50 incident wave periods. A long domain simulation is also carried out to show that the damping of the wave does not occur. Finally, a wave steepness study has been carried out by changing wave height while the wave period was kept fixed. Three-dimensional (3-D) test cases regarding higher order forces on circular cylinder have also been carried out. However, the results will be presented in future work.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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