Painting

Task 23 Navigation

Welcome to Task 23 – Approach

Task is currently inactive

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

 

flags