
Entries Arranged Alphabetically
181
include the calculation of the wave disturbance coefficients.
Note that an estimate of the required storage for your specified output data is
provided through the graphical user interface.
RAM requirements
You can evaluate the required internal memory by
(5.19)
where the unit of
RAM
is MB.
5.5.10 High-frequency noise
The numerical integration of the enhanced Boussinesq equations may some-
times result in instabilities, which eventually may cause a model blow-up. An
example is illustrated in the figure below.
Figure 5.56
High frequency noise
Often the instability (high frequency noise) appears in the computational
domain with the highest water depth (typically near an internal generation line
or at an open boundary). As explained in “Blow-up after some time steps” (p.
174) the time step should be reduced to avoid this instability. Alternatively,
you can use a depth-dependent time-extrapolation factor.
RAM
20 10
4
–
N
x
21 MB
+
(1DH)
RAM
2,0 10
4
–
N
x
N
y
21 MB
+
(2DH)
RAM
2,5 10
4
–
N
x
N
y
21 MB
+
(2DH, incl. wave breaking/moving shoreline)
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...