USER MANUAL SWAN Cycle III version 40.72A

86 Chapter 4
‘fname’
S2D
‘fname’
The definition of this file is given in Appendix D. This output will be made after
every iteration in the case of MODE STATIONARY, and after every time step
in the case MODE NONSTATIONARY (see command MODE).
name of the file to which the output is written; default filename: SWSRC1D.
if the keyword S2D appears variance densities and 6 source terms (see end of
this list of options) as computed will be printed as 2D (frequency and direction)
spectral output. The format of this file is defined in Appendix D. This output will
be made after every iteration in the case of MODE STATIONARY, and after every
time step in the case MODE NONSTATIONARY (see command MODE).
name of the file to which the output is written; default filename: SWSRC2D.
Note that the keywords PAR, S1D and S2D need to be given in that order.
The source terms written due to the presence of the keyword S1D or S2D are source terms
of variance density. The 6 source terms are: wind input, whitecapping, bottom friction,
breaking, 3-wave interactions and 4-wave interactions.
When a number [maxmes] of error messages, see command SET, have been written to the
PRINT file, the computation will stop. If necessary make [maxmes] larger using command
SET, and rerun the program.
4.7 Lock-up
| STATionary [time] |
COMPute ( < > )
| | -> Sec | |
| -> NONSTat [tbegc] [deltc] < MIn > [tendc] |
| HR |
| DAy |
This command orders SWAN to start the computation(s).
If the SWAN mode is stationary (see command MODE), then only the command COMPUTE
should be given here (no options!).
If the SWAN mode is nonstationary (see command MODE), then the computation can be
• either stationary (at the specified time: option STATIONARY here) or
• nonstationary (over the specified period of time: [tbegc] etc.).
To verify input to SWAN (e.g., all input fields such as water depth, wind fields, etc.),
SWAN can be run without computations (that is: zero iterations by using command NUM