
Basic Parameters
111
Temporary file for 1DH applications
On basis of your model parameter specifications (saved in a PFS file, e.g.
run01.bw) the 1DH module generates a new file.
PFS file
The file named run01.bw_FEM.pfs includes all specifications needed to run
your 1DH model.
As default this file will be deleted when the model simulation stops. However,
on the Module Selection dialog you can specify that you would like to save
the file.
5.2.2
Bathymetry
Providing MIKE 21 BW with a suitable model bathymetry is essential for
obtaining reliable results from your model. Setting up the bathymetry requires
more than just specifying a 2D/1D array of accurate water depths covering
the area of interest. It also includes the appropriate selection of the area to be
modelled, the grid spacing, location and type of boundaries etc.
You can start a simulation in two different ways:
as a cold start
as a hot start (2DH module only)
For a cold start the flux is initialized to zero. When choosing this option you
have to specify a 2D grid for 2DH applications (type 2 data file with extension
dfs2 or dt2) or a 1D profile for 1DH applications (type 1 data file with exten-
sion dfs1) containing the bathymetry/mesh.
The hot start facility requires a so-called hot start data file. This must originate
from a previous simulation. The hot start file contains all necessary informa-
tion to continue a simulation. The hot start facility is particularly useful for 2DH
applications involving wave-current interactions, where the wave simulation is
hot started from a run with currents only.
When setting up the bathymetry it should be kept in mind that the water
depths determine which wave conditions that can be modelled. The maxi-
mum water depth restricts the minimum wave period that can be modelled
and the minimum water depth may restrict the wave height if wave breaking
is not included. Further, shallow water results in small wave lengths which
implies small grid spacing which again results in increased CPU time. There-
fore it can be necessary to modify the bathymetry to reach an acceptable
compromise between a correct bathymetry and correct wave conditions.
Содержание 21 BW
Страница 1: ...MIKE 2017 MIKE 21 BW Boussinesq Waves Module User Guide...
Страница 2: ...2...
Страница 4: ...4 MIKE 21 BW DHI...
Страница 13: ...General Description 13 Figure 2 4 Simulation of wave penetration into Frederikshavn harbour Denmark...
Страница 16: ...Introduction 16 MIKE 21 BW DHI...
Страница 75: ...2DH Boussinesq Wave Module Examples 75 Figure 4 45 Visualisation 2D of instantaneous surface elevation...
Страница 185: ...Entries Arranged Alphabetically 185 Figure 5 58 Application of different time extrapolation factors...
Страница 190: ...Reference Manual 190 MIKE 21 BW DHI...
Страница 192: ...Scientific Documentation 192 MIKE 21 BW DHI...
Страница 193: ...193 INDEX...