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*Wave-Time-History |
 
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*Wave-Time-History
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*Wave-Time-History |
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To specify a random seastate in terms of a time history of water surface elevation.
Refer to Time History of Water Surface Elevation for further information on this feature.
Block of lines defining a wave input as a water surface elevation time history:
FILE=File Name
[Direction] [, Y0] [, Z0] [, Time Step], ENSEMBLES=No. of Ensembles
Defining a water surface history is only valid in the time domain. File Name should include the entire path of the water surface elevation file with its extension. If the file name or any part of its path contains spaces then it should be enclosed in double quotation marks. Y0 and Z0 default to 0. Time Step is mandatory if a water surface elevation time history is at uneven intervals. No. of Ensembles is a required input which must be greater than 0.
Input: |
Description |
File Name: |
The name of the ASCII data file containing the wave elevation time history. File Name should ideally include the entire path of the wave time history file, including extension. If the name or any part of its path contains spaces, the full File Name should be enclosed in double quotation marks (" "). The required format of the data file is described in Note (a). |
Wave Direction |
The wave direction, measured in degrees anti-clockwise from the global Y-direction. The default value is 0°. |
Y-Offset |
The offset of the wave source in the global Y-direction. The default value is 0. See Note (b). |
Z-Offset |
The offset of the wave source in the global Z-direction. The default value is 0. See Note (b). |
Time Step |
The time step to be used in interpolating a time history with a fixed time step when the data in the file has a variable time step. |
Ensembles: |
The number of ensembles to be used in the processing of the wave elevation time history. See Note (c). |
(a)The format of the wave elevation timetrace file is as follows.
•The file contains one line of data per time value, with two values per line. The first value is the actual time. The second value is the water surface elevation at that time.
•Comment lines, denoted by a capital ‘C’ in the first column, are permitted.
•Lines that are completely blank are ignored.
(b)By default, the time history is presumed to give the water surface elevation at the vertical axis Y=Z=0, but you can use the Y-Offset and Z-Offset values above to change from the default.
(c)Flexcom uses a Discrete Fourier Transform algorithm to process the wave time history data. Refer to Time History of Water Surface Elevation for further information on this feature.