To run Aqwa2Neut from the Windows command line, enter this command:
C:\Program Files\ANSYS Inc\v242\aqwa\bin\winx64\Aqwa2Neut.exe Arg1 Arg2 Arg3 Arg4
where
Arg1 is the Aqwa-Line (HD) database name (including the path but excluding the extension name);
Arg2 is an integer for the sequence number of the structure, of which the hydrodynamic properties are output;
Arg3 is an optional integer argument for choosing the output contents and the file format (see Table 1.1: Variations of Arg3 and Arg4 and Table 1.2: Types of Output Formats and Contents ;
Arg4 is an optional argument for defining the unit converting coefficients. It must be in the format of three real values separated by comma, if defined, for the length, mass and force converting factor from the current model unit setting to the specified units.
Table 1.1: Variations of Arg3 and Arg4
| Arg3 | Arg4 | Type of Output | Output Data Units |
|---|---|---|---|
| Absent | N/A | 1 | Use Aqwa-Line (HD) analysis units |
| 1 | Defined | 1 | Get coefficients from Arg4 for conversion to the specified units |
| Absent | 1 | Use Aqwa-Line (HD) analysis units | |
| 2 | Defined | 2 | Get unit coefficients from Arg4 |
| Absent | 2 | Use Aqwa-Line (HD) analysis units | |
| 3 | N/A | 1 | Find units from Aqwa-Line *.dat file, then convert to [m,kg,N] |
| 4 | N/A | 3 | Find units from Aqwa-Line *.dat file, then convert to [m,kg,N] |
| 5 | Defined | 3 | Get coefficients from Arg4 for conversion to the specified units |
| Absent | 3 | Use Aqwa-Line (HD) analysis units |
Table 1.2: Types of Output Formats and Contents
| Type of Output | Formats and Contents |
|---|---|
| 1 | .ahd file: Ansys Neutral, panel pressure and tube pressure/velocity/acceleration |
| 2 | .aqw file: AqwaWave Neutral, panel pressure |
| 3 | .ahf file: Ansys Neutral, panel force and tube pressure/velocity/acceleration |
The external load data information file of aqwa_load_data.xml will be created when Arg3 = 3 or 4.
The pressure RAOs on the centroids of the submerged hull surface panels consist of the incident wave, diffraction wave, radiation wave pressure components, and the hydrostatic varying pressure component due to the change in the vertical position.
The disturbed waves, which include the incident wave, diffraction wave, and the radiation wave components, are used for the hydrodynamic property calculation on the tubes located in the external fluid region. Note that the output pressure values at the ends of the tube element (either a circular or slender tube) are the pressures due to the disturbed wave. The hydrostatic varying component is excluded.
In the *.ahf file, the output force at the centroid of the submerged panel is the total first order hydrodynamic force RAO (amplitude and phase in degrees), which includes the force due to the hydrodynamic pressure and the equivalent gravity force (the hydrostatic force varies due to panel normal direction changes).