
Entries Arranged Alphabetically
177
Reducing the wave height
As long as the problem you would like to model is not strongly non-linear you
may reduce the incident significant wave height.
Crash before the first time step
General description
You have started the execution of a simulation and it stops immediately after.
A typical message will be:
Figure 5.55
Stack overflow problem
This error may occur if the stack size is too small, i.e. a stack overflow prob-
lem.
What to do?
You can change the stack size using the MS program EDITBIN.exe. To run
EDITBIN, use the following syntax:
editbin /STACK:10000000 m21bw.exe
In this case the stack size is set to 10 MB. You may also try to use a smaller
number by trial and error.
If all your efforts fail you can contact you local DHI Software Support Centre.
5.5.5
Boussinesq cross terms
The representation of the Boussinesq cross terms (i.e. Q
xyt
, Q
yt
and Q
xt
in the
x-sweep and P
xyt
, P
xt
and P
yt
in the y-sweep (see section 6 Scientific Docu-
) has required special attention. In order to obtain the cor-
rect time-centering, we have used linear time-extrapolation of these terms. A
straightforward numerical representation leads to a backward centering (n/2)
of these terms and will result in artificial dissipation of waves propagating with
an angle to the grid.
Generally, you should always use the linear time-extrapolation when the
Deep Water Terms are included. However, excluding the extrapolation makes
the simulation more stable, at the cost of some numerical damping.
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...