Local grid refinement for free-surface flow simulations

van der Plas, P., 2017, [Groningen]: Rijksuniversiteit Groningen. 196 p.

Research output: ThesisThesis fully internal (DIV)Academic

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  • Peter van der Plas
The principal goal of the current study is to explore and investigate the potential of local grid refinement for increasing the numerical efficiency of free-surface flow simulations in a practical context.
In this thesis we propose a method for local grid refinement in the free-surface flow model ComFLOW, which is based on a finite-volume discretization of the (in)compressible Navier-Stokes equations. This numerical model finds its principal application area in the fields of marine, offshore and coastal engineering, with typical scenarios including the calculation of (wave) impact forces on ships or offshore structures and the simulation of violent physics such as liquid sloshing.
In this study we aimed at the design of a compact and robust local refinement method that is applicable in a wide range of applications and does not conflict with existing and upcoming functionality.
A locally refined Volume-of-Fluid method was presented for the advection of the free surface and special attention was paid to the discretization in the vicinity of cut-cell geometry.
The ultimate goal of local grid refinement is to allow for more efficient grid design and reduced computational times, while maintaining a similar level of accuracy. The performance and applicability of the proposed method was assessed by means of several academic numerical test cases, such as flow around a cylinder, as well as various practical applications that locally demand high grid resolution, such as wave impact on a semi-submersible.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Award date24-Mar-2017
Place of Publication[Groningen]
Print ISBNs978-90-367-9662-0
Electronic ISBNs978-90-367-9662-7
Publication statusPublished - 2017

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