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Modelling viscous effects in offshore flow problems

A numerical study
PhD ceremony:Mr H.J.L. (Henri) van der Heiden
When:March 22, 2019
Supervisor:prof. dr. A.E.P. (Arthur) Veldman
Co-supervisor:dr. ir. R. (Roel) Luppes
Where:Academy building RUG
Faculty:Science and Engineering
Modelling viscous effects in offshore flow problems

The calculation tool ComFLOW, developed at the University of Groningen, is traditionally used to compute forces that result from wave impacts on offshore construction, whether it is a dike or the deck of a ship. ComFLOW is, therefore, a promising tool for engineers working in the offshore industry and having an interest in computing forces due to fluid flow phenomena.

This thesis describes how the software tool ComFLOW can be extended to model the more subtle viscous effects that appear in fluid flows. Firstly, the forces acting on arbitrarily shaped objects that are immersed in a rectangular computational grid need to be accurately computed. In this thesis, the range of applicability of existing models is extended and the resulting method is verified. Secondly, the physical phenomenon of turbulence is modeled. Several approaches to turbulence modeling are presented, derived, compared and verified. Finally, the combined methodology to modeling viscous effects that has been taken up in ComFLOW is validated for the phenomenon of sloshing water motion in holes in ship hulls, so-called moonpools.