Print Email Facebook Twitter Generating and absorbing boundary conditions for combined wave-current simulations Title Generating and absorbing boundary conditions for combined wave-current simulations Author Chang, X. (TU Delft Ship Hydromechanics and Structures) Akkerman, I. (TU Delft Ship Hydromechanics and Structures) Huijsmans, R.H.M. (TU Delft Ship Hydromechanics and Structures) Veldman, A.E.P. (Rijksuniversiteit Groningen) Contributor Huijsmans, R.H.M. (editor) Date 2016 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. Subject Linear and non-linear waves and currentComputational fluid dynamics To reference this document use: http://resolver.tudelft.nl/uuid:945749a9-1426-4e7c-82a2-ecac153cec47 Source Proceedings of the12th International Conference on Hydrodynamics-ICHD 2016 Event ICHD 2016: 12th International Conference on Hydrodynamics, 2016-09-18 → 2016-09-23, Egmond aan Zee, Netherlands Part of collection Institutional Repository Document type conference paper Rights © 2016 X. Chang, I. Akkerman, R.H.M. Huijsmans, A.E.P. Veldman Files PDF 53.pdf 931.76 KB Close viewer /islandora/object/uuid:945749a9-1426-4e7c-82a2-ecac153cec47/datastream/OBJ/view