Welcome to Task 23 – Approach
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A committee of participants will determine the exact approach, but as a starting point for the discussion the following is offered. A multiphase project is proposed. The first phase would be strictly analytical with the goal of verifying the analytical capabilities and differences of the codes of the participants. The second and third phases would compare codes with test data. They are split because they obviously would involve two different sets of test data, probably becoming available at different times.
Concerning Phase I, each code has a unique set of capabilities and simplifying
assumptions. Making comparisons at the simplest possible turbine and support
structure will establish a baseline agreement. Systematically increasing
complexity will help isolate sources of model disagreement and impact
of simplifying assumptions. Table 1 shows an example comparison of codes and corresponding capabilities.
Phases:
| Phase I Code to Code Verification | |
a. |
Agree on model fidelity matrix |
b. |
Agree on fictitious but realistic baseline turbine description (NREL 5 MW baseline?) |
c. |
Agree on support structure description (monopile, jacket, floating) |
d. |
Compare codes for offshore with inverted pendulum turbine model |
i. |
Rigid
support structure with wave loading (assume monopole) 1. linear waves (assume plane progressive wave time series) 2. linear wave spectra 3. nonlinear wave |
ii. |
Flexible
Support Structure with Wave Loading 1. linear waves (assume plane progressive wave time series) 2. linear wave spectra 3. nonlinear wave |
iii. |
Comparison
with Wave Tank Model 1. if there is any public data available |
e. |
Compare codes for onshore turbine (rigid foundation) |
i. |
Rigid
turbine 1. vacuum 2. simple steady aero |
ii. |
Flexible
turbine 1. vacuum 2.simple steady aero 3. turbulence |
f. |
Compare fully coupled codes for various design load cases (DLC) |
i. |
Rigid turbine (aero only) and support structure |
ii. |
Flexible turbine and support structure |
| Phase
II Model Comparisons with Test Data for Shallow water Support Structures |
|
a. |
Identify testing requirements |
b. |
Design test plan |
c. |
Obtain test data and perform comparisons |
| Phase
III Model Comparisons with Test Data for Deepwater support structures |
|
a. |
Identify testing requirements |
b. |
Design test plan |
c. |
Obtain test data and perform comparisons |
