The boundary conditions are defined as described in Figure
3.13. At the inlet, the flow velocity is imposed and hydrostatic
pressure is imposed at the outlet. The following
current velocities are used in the different computations
U0 = 5 cm/s, 7.5 cm/s, 10 cm/s and 15 cm/s (see also section
3.3.2.1)
Both the far field and water surface are considered as
slip walls. A no-slip condition is set at the submerged
buoyant body and skirt surface in order to impose zero
velocity at the wall.
Computat ional modeling: Mesh
For computational modeling, the computational domain
is divided into elements of simple geometry, also called
mesh. The meshing strategy aims at capturing the evolution
of the quantities resolved by the algorithm (velocity,
pressure). This is done within each cell, for each timestep
of the simulation. Smaller cells allow for smaller,
more detailed changes, and higher accuracy. A sufficient
small change across a cell, i.e. small cell size, is required
for the algorithm to give a correct result.