The acronym HAWASSI© stands for
Hamiltonian Wave-Ship-Structure Interaction.
The Hamiltonian formulation calculates phase resolved waves in a dimension-reduced way (Boussinesq with exact or optimized dispersion); the interior fluid motion can be recovered in a post-processing step. The explicit time evolution with automatic time step conserves the approximate energy exactly and avoids instabilities and unwanted dissipation.
Wave-Ship-Structure Interaction refers to waves affected by bathymetry, harbour walls, breakwaters, etc. (Wave-ship interactions will become available in later versions).
The software comes in two versions:
HAWASSI-AB (Analytic Boussinesq)
and
HAWASSI -VBM (Variational Boussinesq Model)
In both versions the total energy in surface variables is approximated by modelling the interior flow is obtained, based on Dirichlet’s minimization principle for potential flows. Presently, the capabilities of the codes make them competitive with other existing software in the following application areas:
HAWASSI-AB for simulations of long-crested (1HD) high, very nonlinear, breaking or non-breaking waves with exact dispersion in wave tanks, with the possibility to obtain reliable statistics about extreme wave occurrence
HAWASSI -VBM for simulations of long (1HD) and short crested waves (2HD) with excellent dispersion properties in coastal areas with harbours and strongly varying bathymetry, and for simulation of oceanic waves
An introduction to the HAWASSI software can be read in the following lecture note: Water Wave Modelling & Simulation by LabMath-Indonesia.
HAWASSI-AB
For simulations of long-crested (1HD) high, very nonlinear, breaking or non-breaking waves with exact dispersion in wave tanks.
For scholarly research, different dispersion relations can be used or specified.
HAWASSI – VBM
For simulations of long (1HD) and short crested waves (2HD) with tailor-made dispersion properties in coastal areas with harbours and strongly varying bathymetry, and for simulation of oceanic waves.