Dear Sir
I am curious about Airy wave theory using in SACS.
Refer to 'Seastate manual',
AIRY in WAVE card means that kinematic will be calculated at wave crest and trough.
AIRC in WAVE card means that kinematic will be calculated at water line (No crest and trough).
Both options are clear.
However, I am curious about 'Extrapolated Airy Wave Theory' and 'Wheeler Stretching Airy Wave Theory' as shown in the figure below.
My question is
1) Do we have 'Extrapolated Airy Wave Theory' in Seastate software ? If not, can we have in the future SACS version ?
2) Do we have 'Wheeler Stretching Airy Wave Theory' in Seastate software ? If not, can we have in the future SACS version ?
3) Is 'Extrapolated Airy Wave Theory' equivalent to 'VS' option in WAVTIM command in Wave response module ?
4) Is 'Wheeler Stretching Airy Wave Theory' equivalent to 'WH' option in WAVTIM command in Wave response module ?
5) Is 'AIRY' in Seastate module equivalent to 'ST' option in WAVTIM command in Wave response module ?
6) Is 'AIRC' in Seastate module equivalent to 'CA' option in WAVTIM command in Wave response module ?
Regards,
Kasiphon
Kasiphon,
Seastate doesn't support Extrapolated Airy Wave Theory yet, only in Wave Response. I will put in an enhancement request.
Seastate doesn't support Wheeler Stretching Airy Wave Theory yet, only in Wave Response. I will put in an enhancement request.
Yes
Geoff
Answer Verified By: Kasiphon Kurojjanawong
Hi,
I stumbled upon this thread and I have some question about it. What stretching method does the AIRY wave theory in SEASTATE module use? Because from what I understand, AIRY waves are based on linear theory, meaning that the free surface is approximated in mean water level (so does the wave particle). But, when I tried to look into the kinematic that AIRY module generate, it generates up to the crest and trough. And in SEASTATE manual, it does not say anything about it. Can you clarify this? Best Regards,
Mukhlas
In addition, I have tried to make comparison of Horizontal particle velocity (m/s) between AIRY, AIRC and STOK5th. I generated the kinematic profile through wave print options number 3 ('VA'). The generated profiles for all theory look "similar", the discrepancies occur only in the elevation height where they stop (AIRC at MSL, AIRY at linear free surface, and STOKES 5th at its free surface). It seems not correct, since AIRY and STOKES 5th kinematic profile should be different. Can you also clarify about this? Maybe I made mistake in some steps throughout the process ? Best Regards,