Preliminary communication
On the Development of Numerical Ocean for Seakeeping Simulations in Openfoam®
Ivan Sulovsky
orcid.org/0000-0003-3058-6244
; University of Rijeka, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatia
*
Jasna Prpić-Oštrić
; University of Rijeka, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatia
* Corresponding author.
Abstract
The ongoing trend of using numerical simulations in marine hydrodynamics yields the need to describe
the potential of developing a numerical environment relevant for seakeeping simulations in CFD,
more precisely in an open-source software OpenFOAM®. In that manner, the main objective of this
paper is to investigate the numerical parameters that affect the well-known issues of dissipative and
dispersive errors that are present with long gravity-driven waves within the finite volume method. Grid
refinement studies are conducted to find a compromise between accuracy and computational cost. The
performance of various methods for the discretization of the temporal derivatives in Navier-Stokes
equations is investigated along with the convective term discretization. Gradient schemes are also
investigated since their choice can heavily influence the pressure calculation and consequently, the
forces acting on the floating body. Furthermore, the inclusion of a standard two-equation turbulence
model leads to an undesirable build-up of turbulent viscosity bellow the free surface, resulting in wave
damping. Therefore, turbulence modelling is also addressed with standard turbulence models together
with stabilized versions, specific for wave applications. Finally, a combination of optimal settings
is proposed and tested. Potential applications of the numerical ocean are discussed, especially with
respect to the problem involving seakeeping and propulsion in irregular waves.
Keywords
Numerical ocean, OpenFOAM®, free surface flows, irregular seas
Hrčak ID:
317230
URI
Publication date:
16.5.2024.
Visits: 232 *