Reliable damping of free-surface waves in numerical simulations

Link:
Autor/in:
Verlag/Körperschaft:
Hamburg University of Technology
Erscheinungsjahr:
2016
Medientyp:
Text
Schlagworte:
  • Absorbing layer
  • Damping coefficient
  • Damping of free-surface waves
  • Scaling law
  • Volume of fluid (VOF) method
Beschreibung:
  • This paper generalises existing approaches for free-surface wave damping via momentum sinks for flow simulations based on the Navier-Stokes equations. It is shown in 2D flow simulations that, to obtain reliable wave damping, the coefficients in the damping functions must be adjusted to the wave parameters. A scaling law for selecting these damping coefficients is presented, which enables similarity of the damping in model and full scale. The influence of the thickness of the damping layer, the wave steepness, the mesh fineness and the choice of the damping coefficients are examined. An efficient approach for estimating the optimal damping setup is presented. Results of 3D ship resistance computations show that the scaling laws apply to such simulations as well, so the damping coefficients should be adjusted for every simulation to ensure convergence of the solution in both model and full scale. Finally, practical recommendations for the setup of reliable damping in flow simulations with regular and irregular free-surface waves are given.
Beziehungen:
DOI 10.1080/09377255.2015.1119921
Quellsystem:
TUHH Open Research

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Quelldatensatz
oai:tore.tuhh.de:11420/5930