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Minimizing undesired wave reflection at the domain boundaries in flow simulations with forcing zones
Citation Link: https://doi.org/10.15480/882.2394
Publikationstyp
Doctoral Thesis
Date Issued
2019-09
Sprache
English
Author(s)
Advisor
Referee
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2019-06-07
Institut
TORE-DOI
TORE-URI
First published in
Number in series
713
Citation
Schriftenreihe Schiffbau 713: (2019)
Publisher
Technischen Universität Hamburg
In this thesis, a theory is presented which predicts the reflection coefficients and the flow within forcing zones (such as absorbing layers, damping zones, relaxation zones, sponge layers, etc.) in flow simulations with (hydro-)acoustic waves and free-surface waves. The derivation is based on a generic forcing zone formulation, thus the present findings can be applied to forcing zones in different flow solvers in a straightforward manner. The theory is validated against results from 1D- to 3D-flow simulations with (hydro-)acoustic waves and free-surface waves, including irregular and highly nonlinear waves. For flow simulations with strongly-reflecting floating bodies subjected to long-crested far-field waves, a novel approach is proposed based on the combination of different forcing zones. The mechanisms by which forcing zones reduce undesired wave reflections are investigated. The influence of the case-dependent parameters of forcing zones is discussed, resulting in recommendations for engineering practice. When the forcing zone was tuned using the developed theory, the simulation results for the reflection coefficient were in most cases smaller or nearly equal to those predicted by theory, but never more than 3.4 percent larger. The developed theory therefore enables the optimization of the case-dependent parameters of the forcing zone before performing the flow simulations.
Subjects
forcing zones
reflection coefficient
free-surface waves
flow simulations
absorbing layers
wave damping
DDC Class
600: Technik
620: Ingenieurwissenschaften
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2019Peric_Dissertation.pdf
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37.84 MB
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