Boundary Data

Wave parameters (Version 1 and 2) data
Wind-sea and swell parameters (Version 1 and 2) data
Wave action spectrum data
Wave energy spectrum data

Wave parameters (Version 1 and 2) data

The wave parameters can be specified in three different ways

·         Constant (in time and along line)

·         Varying in time, constant along line

·         Varying in time and along line

For the case with waves varying in time but constant in along the boundary you have to prepare a data file containing the boundary values before you set up the wave simulation. The data file must be a time series file (dfs0). The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the hydrodynamic simulation. You can choose between different type of interpo­lation (see Interpolation type).

For the case with waves varying both in time and along the boundary you have to prepare a data file containing the boundary values before you set up the wave simulation. The file must be a profile file (dfs1). The mapping from the input data file to the boundary section is described in Interpolation Type. The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the wave simulation. You can choose between different type of interpolation (see Interpolation type).

Wind-sea and swell parameters (Version 1 and 2) data

The wind-sea and swell parameters can be specified in three different ways

·         Constant (in time and along line)

·         Varying in time, constant along line

·         Varying in time and along line

For the case with waves varying in time but constant in along the boundary you have to prepare a data file containing the boundary values before you set up the wave simulation. The data file must be a time series file (dfs0). The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the hydrodynamic simulation. You can choose between different type of interpo­lation (see Interpolation type).

For the case with waves varying both in time and along the boundary you have to prepare a data file containing the boundary values before you set up the wave simulation. The file must be a profile file (dfs1). The mapping from the input data file to the boundary section is described in Interpolation Type. The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the wave simulation. You can choose between different type of interpolation (see Interpolation type).

Wave action spectrum data

The wave action spectrum parameters can be specified in two different ways

·         Varying in time, constant along line

·         Varying in time and along line

In both cases you have to prepare a data file containing the boundary values before you set up the wave simulation. Using the directionally decoupled par­ametric formulation the file must contain the zero-th moment m₀(q ), e.g. expressed by [m²/rad], of the normal wave action spectrum and the first-order moment m₁(q ), e.g. expressed by [m²s/rad], of the normal wave action spec­trum. Using the fully spectral formulation, the file must contain the normal wave action spectrum N(s,q ), e.g. expressed by [m²s²/rad].

For the case "Varying in time, constant along line" the file must be a dfsu file or a dfs1 or a dfs2 file, respectively, for the two different formulations. For the case "Varying in time and along line" the file must be a dsu file containing line information of the spectral parameters. The data file can be obtained from a previous spectral wave simulation when you have saved spectral information in a selected point or along a line. Using the directionally decoupled paramet­ric formulation linear interpolation is used to map the data in the directional domain. Using the fully spectral formulation bilinear interpolation is used to map the data in the frequency-directional domain. The mapping in the geo­graphical domain for the case "Varying in time and along line" is described in Interpolation Type.

The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the hydrodynamic simulation. A linear interpolation will be applied if the time steps differ.

Wave energy spectrum data

The wave energy spectrum parameters can be specified in two different ways

·         Varying in time, constant along line

·         Varying in time and along line

You have to prepare a data file containing the energy spectrum E(f ,q ), e.g. expressed by [m²s/rad], before you set up the wave simulation.

For the case "Varying in time, constant along line" the file must be a dfsu file or a dfs2 file. For the case "Varying in time and along line" the file must be a dsu file containing line information of the energy spectrum. The data file can be obtained from a previous simulation using the fully spectral formulation when you have saved the energy spectrum in a selected point or along a line. The mapping in the geographical domain for the case "Varying in time and along line" is described in Interpolation Type.

Using the directionally decoupled parametric formulation the zero-th and first-order moment of the action density directional spectrum is obtained from the specified energy spectrum by integration in the frequency domain. Linear interpolation is used to map the data in the directional domain. Using the fully spectral formulation bilinear interpolation is used to map the data in the fre­quency-directional domain. The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the hydrodynamic simulation. A linear interpolation will be applied if the time steps differ.