For the case with wind 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 hydrodynamic simulation. The data file must be a time series file (dfs0). This can be done by entering the data in an ASCII file using your normal editor and then reading this file into the standard data file format using the MIKE Zero Time Series Editor. The wind data must cover the complete simulation period. The time step of the wind input data file does not, however, have to be the same as the time step of the hydrodynamic simulation. A linear interpolation of the wind speed and wind direction will be applied if the time steps differ.
For the case with wind varying both in time and domain you have to prepare a data file containing the wind speed components and air pressure before you set up the hydrodynamic simulation. The file must be a 2D unstructured data file (dfsu) or a 2D grid data file (dfs2). This can be done by either using one of the two MIKE 21 wind generating programs (cyclone generated wind and pressure, or wind generated on the basis of digitised pressure fields). Or you can enter the data in an ASCII file using your normal editor and then reading this file into the standard data file format using the MIKE Zero Grid Series Editor. The area in the data file must cover the model area. If a dfsu-file is used, piecewice constant interpolation is used to map the data. If a dfs2-file is used, bilinear interpolation is used to map the data. The wind data must cover the complete simulation period. The time step of the wind 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.