MIKE 21 BW, User Manual, Page: 74 / 196

Examples
74 MIKE 21 BW - © DHI
results in a smaller run-up than if a value within the recommended interval
was used. The large value was choosing for numerical stability reasons and
will affect the wave-induced current pattern marginally.
Model run
Before you execute the MIKE 21 BW model simulations you have to provide
internal wave boundary data. Simply drag and drop the file 'Rip_Channel.21t'
into your MIKE Zero shell, go to the 'waves' entry, select the 'Rip channel - H=
2.8m, T= 7.9s, h= 20m and click on run button.
The length of the simulation is 20 minutes (corresponding to 12001 time
steps or approximately 150 wave periods).
The computation time depends on the speed of your PC. For a laptop IBM
T40 Pentium M (Centrino, 1.6 GHz and 1GB DDR RAM) the required system
time is approximately 7 hours (the system CPS is approximately 180,000
points/second).
You may reduce the length of the simulations in order to reduce the overall
CPU time.
Model results
Figure 4.45 shows a 2D visualisation of the simulated instantaneous surface
elevation. The most visible wave phenomena are refraction, shoaling, nonlin-
ear wave-wave interaction (generation of higher harmonic waves).
Figure 4.46 shows 3D visualisations of the simulated instantaneous surface
elevation. The surface rollers are shown in white. You can make a similar plot
by loading (double-click) the PFS-file 'Anim Regular Waves with Roller.lyt'
into the MIKE Animator Plus program during or after model execution assum-
ing you have a valid licence for MIKE Animator Plus.