Wind data

When the speed and direction option is selected the format of the wind data can be specified in three different ways

·         Constant (in domain and time)

·         Varying in time, constant in domain

·         Varying in time and domain

For the case with wind field varying in time but constant in domain you have to prepare a data file containing the wind speed and direction (in degrees from true North) before you set up the spectral 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 spectral wave simulation. A linear interpolation will be applied if the time steps differ.

For the case with wind field varying both in time and domain you have to pre­pare a data file containing the wind speed and direction (in degrees from true North) before you set up the spectral wave simulation. The file must be a 2D unstructured data file (dfsu) or a 2D grid data file (dfs2). The area in the data file must cover the model area. If a dfsu-file is used piecewise constant inter­polation is used to map the data, while if a dfs2-file is used bilinear interpola­tion is used. 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 spectral wave simulation simulation. A linear interpolation will be applied if the time steps differ.

When the velocity components option is selected the format of the wind data must be specified as varying in time and domain. You have to prepare a data file containing the two velocity components before you set up the spectral wave simulation. The file must be a 2D unstructured data file (dfsu) or a 2D grid data file (dfs2). The area in the data file must cover the model area. If a dfsu-file is used piecewise constant interpolation is used to map the data, while if a dfs2-file is used bilinear interpolation is used. 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 spectral wave simula­tion simulation. A linear interpolation will be applied if the time steps differ.