Generating and absorbing boundary conditions for combined wave-current simulations

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Abstract

The CFD simulation tool ComFLOW is extended to investigate the characteristics of wave motions in the presence of steady uniform currents. Initially, the inflow boundary is the superposition of waves and current. Effect of the latter on the former is resolved by solving Navier-Stokes equations within the domain as a next step. A Generating and Absorbing Boundary Condition (GABC) with currents is introduced that allows the simulation of a combined wave-current environment in truncated domain. This GABC is characterized by a rational function approximation of dispersion relation, based on Sommerfeld condition and irrotational wave model. The artificial boundaries where GABC with current is applied are transparent to incoming and outgoing waves and currents simultaneously. The absorption properties of the GABC for various waves and currents are analysed. The temporal and spatial differences of free surface elevation between the small domain and large domain turn out to be small, i.e. the GABC prevents the reflection from the boundaries well. The large domain here is arranged in such a way that the reflected waves and currents will not reach the outflow boundary of the small domain within the simulation time. The behaviour of GABC in 3D domain is also investigated, where waves and currents are traveling under an angle of incidence colinearly.
Original languageEnglish
Title of host publicationProceedings of the12th International Conference on Hydrodynamics-ICHD 2016
EditorsR.H.M. Huijsmans
Number of pages8
Publication statusPublished - 2016
EventICHD 2016: 12th International Conference on Hydrodynamics - Egmond aan Zee, Netherlands
Duration: 18 Sep 201623 Sep 2016

Conference

ConferenceICHD 2016: 12th International Conference on Hydrodynamics
CountryNetherlands
CityEgmond aan Zee
Period18/09/1623/09/16

Keywords

  • Linear and non-linear waves and current
  • Computational fluid dynamics

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