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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)
Summary of Contents for 21 BW
Page 1: ...MIKE 2017 MIKE 21 BW Boussinesq Waves Module User Guide...
Page 2: ...2...
Page 4: ...4 MIKE 21 BW DHI...
Page 16: ...Introduction 16 MIKE 21 BW DHI...
Page 190: ...Reference Manual 190 MIKE 21 BW DHI...
Page 192: ...Scientific Documentation 192 MIKE 21 BW DHI...
Page 193: ...193 INDEX...