Results |
 
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Results |
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You can use the hyperlinks below to browse through the results comparisons for the subset of OC4 Phase II load cases considered. Official results from OC4 were obtained from the IEA (International Energy Agency) Wind website, or more specifically, the IEA Wind Task 30 results library. Results from Flexcom are presented alongside results from a subset of the software tools used in OC4 Phase II. This helps to reduce clutter on graph comparisons, whilst still including some of the most well-known software tools in industry. For clarity, Flexcom results are overlaid as the last data series in each graph with the data series shown in dashed red to be distinctive.
We will be adding more test cases to the benchmark comparisons over time, once the relevant models have been completed.
Load Case |
Description |
Wind |
Wave |
|---|---|---|---|
Eigenanalysis |
No wind |
Still water |
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Static equilibrium |
No wind |
Still water |
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Free decay, surge |
No wind |
Still water |
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Free decay, heave |
No wind |
Still water |
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Free decay, pitch |
No wind |
Still water |
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Free decay, yaw |
No wind |
Still water |
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Regular waves |
No wind |
Regular airy: H = 6 m, T = 10 s |
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Irregular waves |
No wind |
Irregular airy: Hs = 6 m, Tp = 10 s, γ=2.87, JONSWAP spectrum |
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Current only |
No wind |
Surface = 0.5 m/s, 1/7th power law decrease with depth |
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Current and regular waves |
No wind |
Regular airy: H = 6 m, T = 10 s; current at surface = 0.5 m/s, 1/7th power law |
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50-year extreme wave |
No wind |
Irregular airy: Hs = 15.0 m, Tp = 19.2 s, γ=1.05, JONSWAP spectrum |
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RAO estimation, no wind |
No wind |
Banded white noise, PSD =1 m2/Hz for 0.05-0.25 Hz |
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Deterministic, below rated |
Steady, uniform, no shear: Vhub = 8 m/s |
Regular airy: H = 6 m, T = 10 s |
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Deterministic, below and above rated |
Variable, uniform, shear: Vhub = 5/10/15/20 m/s |
Regular airy: H = 6 m, T = 10 s |
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Stochastic, at rated |
Turbulent (Mann model): Vhub = Vr (11.4 m/s) |
Irregular airy: Hs = 6 m, Tp = 10 s, γ=2.87, JONSWAP spectrum |
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Stochastic, above rated |
Turbulent (Mann model): Vhub = 18 m/s |
Irregular airy: Hs = 6 m, Tp = 10 s, γ=2.87, JONSWAP spectrum |
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Wind/wave/current |
Steady, uniform, no shear: Vhub = 8 m/s |
Regular airy: H = 6 m, T = 10 s; current at surface = 0.5 m/s, 1/7th power law |
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50-year extreme wind/wave |
Turbulent (Mann model): Vhub = 47.5 m/s |
Irregular airy: Hs = 15.0 m, Tp = 19.2 s, γ=1.05, JONSWAP spectrum |
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Wind/wave misalignment |
Steady, uniform, no shear: Vhub = 8 m/s |
Regular airy: H = 6 m, T = 10 s, direction = 30⁰ |
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RAO estimation, with wind |
Steady, uniform, no shear: Vhub = 8 m/s |
Banded white noise, PSD =1 m2/Hz for 0.05-0.25 Hz |
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OC4 P2 LC3.8 |
Mooring line loss |
Steady, uniform, no shear: Vhub = 18 m/s |
Regular airy: H = 6 m, T = 10 s |
OC4 P2 LC3.9a |
Flooded column |
No wind |
Still water |
OC4 P2 LC3.9b |
Flooded column |
Turbulent (Mann model): Vhub = 18 m/s |
Irregular airy: Hs = 6 m, Tp = 10 s, γ=2.87, JONSWAP spectrum |
*not part of OC4 Phase II