USER MANUAL SWAN Cycle III version 40.72A

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44 Chapter 4 [k] CCW, CLOCKWISE SEGMENT XY [x], [y] IJ boundary is the north edge (if present) of the computational area, likewise for W is west, S is south, E is east, NW is northwest, NE is northeast, SW is southwest and SE is southeast. The side does not have to face exactly the given direction (the nearest direction of the normal to the side is taken; this direction is determined as the normal to the sum of the vectors joining the grid points on the boundary; there is an interruption in the boundary (due to the occurrence of exception values) then this interruption is ignored in the summation). Note: in case of Cartesian coordinates, the direction of the problem coordinate system must be defined by the user (see the SET ...[north] command), by default the positive x−axis points East. ONLY MEANT FOR REGULAR GRIDS. indicates on which side of the unstructured grid the boundary condition is applied. The value of [k] corresponds to the boundary marker as indicated in file(s) produced by a grid generator (such as in the last column of the Triangle .node file and the Easymesh .n file or the last part of file fort.14). Boundary markers are tags to identify which vertices occur on a boundary of the mesh. ONLY MEANT FOR UNSTRUCTURED MESHES. see description of [len] below; these option are only effective if the option VARIABLE is used (see below). is used if SIDE is not used, i.e. either the boundary segment goes around a corner of the grid, or the segment is only part of one side of the grid. The distance along the segment (see [len] below) is measured from the first point of the segment (see XY or IJ). the segment is defined by means of a series of points in terms of problem coordinates; these points do not have to coincide with grid points. The (straight) line connecting two points must be close to grid lines of the computational grid (the maximum distance is one hundredth of the length of the straight line). This option is default. problem coordinates of a point of the boundary segment (see command COORD). the segment is defined by means of a series of computational grid points given in terms of grid indices (origin at 0,0); not all grid points on the segment have to be mentioned. If two points are on the same grid line, intermediate points are assumed to be on the segment as well. [i], [j] grid indices of a point of the segment. Values of [i] range between 0 and [mxc] (see command CGRID), values of [j] between 0 and [myc] (inclusive). ONLY MEANT FOR STRUCTURED GRIDS. [k] index of boundary vertex of the segment. This can be obtained in a grid generator file (fort.14, .node and .n files of ADCIRC, Triangle and Easymesh, respectively). ONLY MEANT FOR UNSTRUCTURED MESHES.
Description of commands 45 CONSTANT VARIABLE PAR [hs] [per] [dir] [dd] [len] FILE with this option the wave spectra are constant along the side or segment. with this option the wave spectra can vary along the side or segment. The incident wave field is prescribed at a number of points of the side or segment, these points are characterized by their distance from the begin point of the side or segment. The wave spectra for grid points on the boundary of the computational grid are calculated by <strong>SWAN</strong> by the spectral interpolation technique described in Section 2.6.3. the wave spectra are defined by means of the following spectral parameters (see command BOUND SHAPE for spectral shape). the significant wave height (in m). the characteristic period of the energy spectrum (relative frequency; which is equal to absolute frequency in the absence of currents); [per] is the value of the peak period (in s), if option PEAK is chosen in command BOUND SHAPE or [per] is the value of the mean period, if option MEAN was chosen in command BOUND SHAPE. the peak wave direction (θ peak , direction in degrees, constant over frequencies). coefficient of directional spreading; a cos m (θ) distribution is assumed. [dd] is interpreted as the directional standard deviation in degrees, if the option DEGREES is chosen in the command BOUND SHAPE. Default: [dd]=30. [dd] is interpreted as the power m, if the option POWER is chosen in the command BOUND SHAPE. Default: [dd]=2. is the distance from the first point of the side or segment to the point along the side or segment for which the incident wave spectrum is prescribed. Note: these points do no have to coincide with grid points of the computational grid. [len] is the distance in m or degrees in the case of spherical coordinates, not in grid steps. The values of [len] should be given in ascending order. The length along a SIDE is measured in clockwise or counterclockwise direction, depending on the options CCW or CLOCKWISE (see above). The option CCW is default. In case of a SEGMENT the length is measured from the indicated begin point of the segment. means that the incoming wave data are read from a file. There are three types of files: • TPAR files containing nonstationary wave parameters, • files containing stationary or nonstationary 1D spectra (usually from measurements), • files containing stationary or nonstationary 2D spectra (from other computer programs or other <strong>SWAN</strong> runs). A TPAR file is for only one location; it has the string TPAR on the first line of the file and a number of lines which each contain 5 numbers, i.e.:
Page 1: SWAN USER MANUAL SWAN Cycle III ver
Page 5 and 6: Contents 1 Introduction 1 2 General
Page 7 and 8: TABLE . . . . . . . . . . . . . . .
Page 9 and 10: Chapter 1 Introduction The informat
Page 11 and 12: Chapter 2 General definitions and r
Page 13 and 14: General definitions and remarks 5 r
Page 15 and 16: General definitions and remarks 7 I
Page 17 and 18: which SWAN performs the computation
Page 19 and 20: General definitions and remarks 11
Page 27 and 28: Chapter 3 Input and output files 3.
Page 29 and 30: Chapter 4 Description of commands 4
Page 31 and 32: (h) Commands to write or plot outpu
Page 33 and 34: Description of commands 25 ’name
Page 35 and 36: Description of commands 27 Default:
Page 37 and 38: Description of commands 29 mesh. Th
Page 39 and 40: ⎛ ∆f = ⎝−1 + Description of
Page 41 and 42: Description of commands 33 • Easy
Page 43 and 44: Description of commands 35 grids ca
Page 45 and 46: Description of commands 37 y ′
Page 47 and 48: Description of commands 39 [fac]
Page 49 and 50: Description of commands 41 ’(10X,
Page 51: Description of commands 43 | | East
Page 55 and 56: Description of commands 47 points o
Page 57 and 58: Description of commands 49 CRAY WKS
Page 59 and 60: Description of commands 51 This com
Page 61 and 62: Description of commands 53 | JANSse
Page 63 and 64: Description of commands 55 [Csh3] c
Page 65 and 66: Description of commands 57 [ursell]
Page 67 and 68: Description of commands 59 [slope]
Page 69 and 70: Description of commands 61 [cgmod]
Page 71 and 72: Description of commands 63 < > [lim
Page 73 and 74: Description of commands 65 SIGIMPL
Page 75 and 76: Description of commands 67 ’sname
Page 77 and 78: Description of commands 69 (see bel
Page 79 and 80: Description of commands 71 [alpn] d
Page 81 and 82: Description of commands 73 ‘long
Page 83 and 84: | HSign | | | | HSWEll | | | | DIR
Page 85 and 86: Description of commands 77 | WLENgt
Page 87 and 88: Description of commands 79 QP DEPTH
Page 89 and 90: Description of commands 81 [tbegblk
Page 91 and 92: Description of commands 83 OUTput [
Page 93 and 94: Description of commands 85 If SWAN
Page 95 and 96: Description of commands 87 ACCUR MX
Page 97 and 98: Appendix A Definitions of variables
Page 99 and 100: Definitions of variables 91 RPER co
Page 101 and 102: Definitions of variables 93 WLEN Th
Page 103 and 104:
Appendix B Command syntax B.1 Comma
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Repetitions of keywords and/or othe
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Required data and optional data Com
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Appendix C File swan.edt Below the
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File swan.edt 103 ! | -> DEFault !
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File swan.edt 105 ! FRAME ’sname
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Appendix D Spectrum files, input an
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0.3892E-03 192.0 15.2 0.8007E-03 24
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Spectrum files, input and output 11
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Spectrum files, input and output 11
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Bibliography [1] SWAN - Implementat
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117 longitude, 8, 27, 49, 50, 85, 1
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