Numerische Modellierung von Fluid-Struktur-Wechselwirkungen an wellenbeaufschlagten Strukturen

Fuchs, Vilmar

kassel university press, ISBN: 978-3-86219-545-9, 2014, 210 Pages
(Berichte des Instituts für Mechanik 2/2014)

Zugl.: Kassel, Univ., Diss. 2013

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Content: This work deals with the numerical modelling of multi-regional fluid-structure interaction (FSI) on wave-impacted offshore structures using a partitioned block Gauss-Seidel solution method. The partial partitions of the multi-regional or multi-physics computational fields are solved with the numerical finite volume method (FVM). The main focus of the work is on the development of a fluid-structure interaction algorithm for the investigation of damping properties of high viscose Newtonian and non-Newtonian fluids. The numerical investigations were done on the example of an offshore damping element prototype, which is a component integrated on the mono-pile offshore wind turbine tower pillars. This mainly consists of a thin-walled, flexible cover, which is fastened around the mono-pile offshore structure at wave level. The chamber between the flexible and rigid mono-pile wall is filled with a viscous damping fluid, which should damp the pulse-type loading caused by the effect of extreme wave impacts on the tower pillars. The multi-regional FSI simulation model of the damping element prototype generated for the investigation on damping features of fluids consists of a total of three computational regions, which interact with each other implicitly via a block Gauss-Seidel coupling algorithm. The first computational region represents a two-phase flow model of a breaking wave, as an external hydrodynamic load on the damping element. The offshore damping element itself consists of the second and third partial partition. These two partial partitions form the exterior flexible structure cover and the viscous damping liquid. Based on experimental preliminary tests in a water channel, a fluidic oscillator and an oscillating elastic beam made of rubber, the capability of the three partial partitions of the FSI solver are first tested and validated. The validation of the multi-regional FSI solver is done in the example of a benchmark of a breaking dam well known in literature. The calculation of the offshore damping element prototype is then carried out with each of three parameter sets of high viscosity Newtonian and shear thinning non-Newtonian fluids. Finally the various interactions of the damping liquids were analysed and assessed, based on the chronological development of the pressure curves and the dissipation energy, which is defined as the volume integral over the dissipation function.

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