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Damping of non-linear and irregular long-crested free-surface waves using forcing zones
Citation Link: https://doi.org/10.15480/882.3326
Publikationstyp
Conference Paper
Date Issued
2019-09
Sprache
English
Author(s)
Herausgeber*innen
Institut
TORE-DOI
TORE-URI
Article Number
17
Citation
11th International Workshop on Ship and Marine Hydrodynamics (IWSH2019), Paper 17
Contribution to Conference
Forcing-zone-type approaches (such as absorbing layers, damping zones, sponge layers, relaxation zones, etc.) can be used to reduce undesired wave reflections at the domain boundaries in flow simulations with free-surface waves. They introduce source terms in one or several of the governing equations in a zone adjacent to the corresponding domain boundaries, with the intention of gradually forcing the solution within the zone towards some reference solution. These source terms contain case-dependent parameters that require tuning. Perić and Abdel-Maksoud (2018) presented a theory which predicts the reflection coefficients and the flow within forcing zones. The present work investigates the accuracy of the theory via 2D-flow simulations with forcing zones for strongly non-linear and irregular free-surface waves. The results provide insight into the mechanisms behind how forcing zones reduce undesired wave reflections. Application of the present findings to 3D-flow simulations is discussed. When the forcing zone was tuned using the developed theory, the simulation results for reflection coefficient C R were in most cases smaller or nearly equal to those predicted by theory, but never more than 2.1% larger. Therefore the theory is recommended for tuning forcing zones with non-linear and irregular free-surface waves.
Subjects
Flow simulation
Forcing zones
Free surface waves
Irregular waves
Nonlinear waves
Wave damping
DDC Class
600: Technik
620: Ingenieurwissenschaften
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