You may define any number of Ocean Current objects in your analysis, but they will only have an effect on the calculation if they are selected in the Current Definition column of the Ocean Environment Wave Case Definition table.
Use the Velocity and Direction property to set the way in which the current is defined. The available options are:
Simplified Definition: Current is defined by a Velocity at Surface, a Velocity at Seabed and a constant current Direction
Advanced Definition: Current is defined by varying Velocity and Direction values at specified Depth increments in the Advanced Current Definition tabular data input. Click the
icon to add more rows
to the table.
For both types of current definition the Current Stretching option allows adjustments to the current profile to account for cases where the wave amplitude is large relative to the Ocean Depth, such that significant wave-current interactions exist. The available options are:
Off: no profile adjustment, with constant current velocity above the Ocean Mean Water Level.
Linear: linearly stretch or compress the profile from the seabed to the wave surface.
Linear and Flow Continuity: as for Linear, but with a further adjustment to maintain flow continuity. This option requires the current direction to be constant with depth.
Nonlinear: where Wave Theory is set to Random, Shell New Wave or Constrained, perform a nonlinear stretching or compression of the current profile from the seabed to the wave surface.
Program Controlled: sets Current Stretching to:
Nonlinear when the Wave Theory is Random, Shell New Wave or Constrained
Linear and Flow Continuity if Velocity and Direction is set to Simplified Definition, or if current direction is constant with depth in the Advanced Current Definition table
Linear otherwise
