Naslov
Numerical modelling of coupled potential and viscous flow for marine applications

Autori
Vukčević, Vuko

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, doktorska disertacija

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
08.11

Godina
2016

Stranica
281

Mentor
Jasak, Hrvoje

Ključne riječi
Marine hydrodynamics ; Free surface flows ; Ghost Fluid Method ; Implicitly redistanced Level Set method ; Solution and domain decomposition ; Polyhedral Finite Volume method ; OpenFOAM ; Validation and verification

Sažetak
A numerical framework for coupling arbitrary potential flow with fully nonlinear, two-phase and turbulent Computational Fluid Dynamics model is presented in this work. The model is implemented in arbitrary polyhedral Finite Volume method in OpenFOAM software. The present model relies on the Ghost Fluid Method for discretisation of jump conditions, yielding infinitesimally sharp density and pressure jumps across the free surface. Interface capturing is achieved with implicitly redistanced Level Set method, rendering additional redistancing steps unnecessary. The potential and viscous flow coupling is achieved via Spectral Wave Explicit Navier-Stoked Equations approach, where the solution is decomposed into incident potential flow solution and perturbation components. Wave reflection is prevented by using relaxation zones with implicit treatment. All methodologies are mathematically and reformulated to adhere to strongly conservative, polyhedral Finite Volume method. The numerical model is validated and verified on four sets of test cases: free surface flow over a ramp, wave propagation, assessment of higher order forces on a vertical cylinder and seakeeping of a ship. The computational results compare well with analytical, other numerical and experimental results. A strong emphasis is given to numerous sensitivity studies addressing numerical uncertainties.Scientific contributions of this work is the reformulation of the above mention mehods for Finite Volume discretisation and their implementation in the same numerical framework.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA