Position vectors used for reference during import of AQWA data If the units cannot be determined, or if they are a mixture of SI and US, OrcaFlex will be unable to convert the data in this way: in this case, the raw data will be imported from the file unscaled and a warning will be issued.
If this is successful, then OrcaFlex will scale the data (if necessary) from the units in use in the file to the units prevailing in the OrcaFlex model. OrcaFlex first attempts to determine the units in use in the file, from the values it contains for acceleration due to gravity and water density and the knowledge that the unit of time is the second. There may also be further difficulties of similar nature that we have not yet seen. This may be significant for users making use of the AQWA "move structure" data record. In the absence of this information OrcaFlex interprets motions imported along and about the AQWA output x-direction as surge and roll, motions imported along and about the AQWA output y-direction as sway and pitch, etc. One known issue is that the AQWA output file contains no reliable indication of any yaw rotation between the AQWA fixed reference axes and the analysed structures.
ORCAFLEX COORDINATE CONVERSION CODE
As a result there may be deficiencies in the OrcaFlex import code and you must carefully review the imported hydrodynamic data to confirm the correctness of the import procedure. The OrcaFlex import of AQWA output data has been developed without assistance from the developers of AQWA. AQWA results are output in dimensional form, to a text file with a.
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