aqwa-flow

AQWA-FLOW USER GUIDE

I.INTRODUCTION

AQWA-FLOW is a post-processor which reads in the data base created by a preceding AQWA-LINE analysis and calculates the flow parameters at user specified locations within the flow field. The parameters calculated include:

phase angle; x, y, z components

and

amplitude

Velocity

Acceleration amplitude and phase angle; x, y, z components

Total potential amplitude and phase angle

Hydrodynamic pressure amplitude and phase angle

Wave surface elevation amplitude and pressure (for points on the surface) II.INPUT FILES

The input files required by AQWA-FLOW include

AL*.RES ---- Binary file created by a preceding AQWA-LINE run which stores mesh information and hydrodynamic data base. (“*” represents up to 6 characters and/or numbers, also called run identifier)

AL*.USS ---- Binary file created by a preceding AQWA-LINE run which stores source strengths at each diffracting panel.

AL*.COR ---- Free format ASCII file created by user defining the coordinates of the points at which the flow parameters are to be calculated. The following is an example of a AL*.COR file defining m points:

1 x1 y1 z1

2 x2 y2 z2

………

m xm ym zm

in which the first number in each row (must be an integer) is the point series number, followed by the x, y, z coordinates of the point. Note that the x, y, z should be in the AQWA Global coordinate system and z should be less than or equal to zero.

III OUTPUT FILE

There is only one output file, named as AL*.TXT, from AQWA-FLOW containing the flow parameters at the user specified points for all the wave frequencies and directions defined in the AQWA-LINE data file.

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IV PROCEDURE FOR RUNNING AQWA-FLOW

A preceding AQWA-LINE analysis should already have been performed successfully before running AQWA-FLOW. Note that in order to have an AL*.USS file created by AQWA-LINE, an option LDOP must be input in the OPTIONS deck in the AQWA-LINE data file.

To run AQWA-FLOW, go into the directory where the required input files are stored, and type FLOW (with proper path if not in the directory where FLOW.EXE is residing) and return, type in the run identifier * at the prompt and return, the program will start executing. The output file AL*.TXT will be created at the end of the run if it is successfully completed.

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