
Reference Manual
142
MIKE 21 BW - © DHI
1DH Boussinesq wave module
The figure below shows an example where a porosity layer is applied to
model partial reflection in case of a numerical wave flume, see Section 4.3.1.
Figure 5.29
Model setup (vertical cross-section). An 8 point wide porosity layer is
used at the left-hand side boundary
Specifying porosity layer
For a given set of porous flow parameters (see section Recommended poros-
ity layer parameters below), the porosity values required to obtain a desired
reflection coefficient, can be determined by the use of the MIKE 21 Toolbox
program
Calculation of Reflection Coefficients
.
Important!
The porosity should never be smaller than 0.2.
For impermeable structures, the porosity layer should be backed by an
impermeable land grid point.
Recommended porosity layer parameters
When determining the porosities to be used in your simulation, the values of
the porous flow parameters are not that important. Unless you have a specific
reason for using other values, these parameters can usually be left at their
default values, which are:
Kinematic viscosity: 1.4·10
-6
m
2
/s
Stone diameter: 0.2 m
Laminar resistance parameter: 1000
Turbulent resistance parameter: 2.8
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...