HydroDyn user documentation update for large platform rotation #2455
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…ch the finalized large-yaw implementation
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@andrew-platt Looks like we have the wrong label here. |
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Whoops. I was looking at something in AeroDyn when I set the tag... |
jjonkman
reviewed
Oct 12, 2024
| 0 ExctnDisp - Method of computing Wave Excitation {0: use undisplaced position, 1: use displaced position, 2: use low-pass filtered displaced position) [only used when PotMod=1 and ExctnMod>0 and SeaState's WaveMod>0]} (switch) | ||
| 10 ExctnCutOff - Cutoff (corner) frequency of the low-pass time-filtered displaced position (Hz) [>0.0] [used only when PotMod=1, ExctnMod>0, and ExctnDisp=2]) [only used when PotMod=1 and ExctnMod>0 and SeaState's WaveMod>0]} (switch) | ||
| 0 PtfmYMod - Model for large platform yaw offset {0: Static reference yaw offset based on PtfmRefY, 1: dynamic reference yaw offset based on low-pass filtering the PRP yaw motion with cutoff frequency PtfmYCutOff} (switch) | ||
| 0 PtfmRefY - Constant (if PtfmYMod=0) or initial (if PtfmYMod=1) platform reference yaw offset (deg) |
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Presumably this angle should be in the [-180, 180) deg range?
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PtfmRefY does not need to be strictly between [-180,180), not intentionally at least. Integer multiples of 360 deg are added as appropriate at various places in the code to handle this.
| still allowing the simulation to continue if possible. | ||
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| With **PtfmYMod** = 1, HydroDyn requires the first- and second-order | ||
| potential-flow wave excitation input file(s) to cover the full range |
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I thought second-order must be disabled with PtfmYMod =1?
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We should still support mean- and slow-drift loads through MnDrift or NewmanApp. This is explained below, but I added a clarification here as well.
…ly works with mean- or slow-drift loads from Newman's approximation
jjonkman
approved these changes
Oct 14, 2024
andrew-platt
approved these changes
Oct 21, 2024
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Feature or improvement description
Related issue, if one exists
This is the documentation update for PR #2203
Impacted areas of the software
Docs, HydroDyn
Test results, if applicable
The changes have no impact on the results.