SWASH | CREST project

Information

Simulating WAves till Shore

http://swash.sourceforge.net/

SWASH is a general-purpose numerical tool for simulating unsteady, non-hydrostatic, free-surface, rotational flow and transport phenomena in coastal waters as driven by waves, tides, buoyancy and wind forces. It provides a general basis for describing wave transformations from deep water to a beach, port or harbour, complex changes to rapidly varied flows, and density driven flows in coastal seas, estuaries, lakes and rivers.

Developed by: The SWASH Team (led by Dr. Marcel Zijlema, TUDelft)

Location

Beach, Dike

Variables

velocity

pressure

free surface elevation

etc.

Equations

Non-linear Shallow Water eqs.
+ non-hydrostatic pressure term (single layer)

RANS (Multi layer)

Turbulence closure (standard k-ε model)

Boundary conditions

Wave boundary: weakly reflective condition, Wave parameter, spectrum, time series of eta, velocity

Bottom: Bottom friction

End boundary: Wall or Sommerfeld

Lateral boundaries: wall or periodic BC

Data needs

Measured data:

H.B.C. offshore (Hm0, Tp, dir, dir.spr, spectrum shape)

Bathymetry

Topography

Coordinate system

Grid type

Advantages

Fast solver (compared to DualSPHysics/OpenFOAM)

Weaknesses

Depth integrated

air-entrainment is not possible

complex structure (e.g. parapet)

plunging wave

Calibration

Breaking control parameter, bottom friction, Viscosity, … (wave transformation)

Incident wave properties (wave overtopping)

Validation

Wave transformation

Water surface elevation, velocity

Physical model, field measurement

Wave overtopping

Layer thickness, speed, discharge

Physical model, field measurement

Published: Wed, 04/03/2019 - 12:03 | Last updated: Tue, 11/12/2019 - 14:09