Comparison of Coupled and Uncoupled Modeling of Floating Wind Farms with Shared Anchors

Coughlan, Katherine; Lozon, Ericka; Hall, Matthew; Martin, Bruce; Arwade, Sanjay

doi:10.3390/jmse13010106

Comparison of Coupled and Uncoupled Modeling of Floating Wind Farms with Shared Anchors

Journal Article · Tue Jan 07 23:00:00 EST 2025 · Journal of Marine Science and Engineering

DOI:https://doi.org/10.3390/jmse13010106· OSTI ID:2530901

^[1]; Lozon, Ericka ^[2]; Hall, Matthew ^[2]; Martin, Bruce ^[3]; Arwade, Sanjay ^[4]

National Renewable Energy Laboratory (NREL), Golden, CO (United States); Univ. of Massachusetts, Amherst, MA (United States)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Principle Power Inc., Emeryville, CA (United States)
Univ. of Massachusetts, Amherst, MA (United States)

As design options for floating wind farms continue to be explored, shared (or multiline) anchors that secure mooring lines from multiple turbines remain a promising technology that can potentially reduce the number of anchors and overall mooring costs. This study evaluates two methods for analyzing the loads on shared anchors: one in which floating offshore wind turbines are simulated individually (using the software OpenFAST), and one in which an entire floating wind farm is simulated collectively (using the software FAST.Farm). A three-line shared anchor is evaluated for multiple loading scenarios in deep water, using the International Energy Agency 15 MW turbine on the VolturnUS-S semisubmersible platform. While the two methods produce broadly comparable results, the coupled wave loading on platforms within the farm results in wave force cancellations and amplifications that decrease multiline force directional ranges and increase multiline force extreme values (up to 7%) and standard deviations (up to 11%) for wave-driven load cases. The inclusion of wakes in FAST.Farm also reduces the net load on the shared anchor due to the velocity deficit, leading to larger differences between OpenFAST and FAST.Farm (up to 3% difference in mean loads) for load cases with operational turbines.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office; National Science Foundation (NSF); National Offshore Wind Research and Development Consortium (NOWRDC)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2530901

Report Number(s):: NREL/JA--5000-89703; MainId:90482; UUID:491ea8b8-3bcb-4fee-8125-8c6442ff9571; MainAdminId:72596

Journal Information:: Journal of Marine Science and Engineering, Journal Name: Journal of Marine Science and Engineering Journal Issue: 1 Vol. 13; ISSN 2077-1312

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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17 WIND ENERGY
floating offshore wind
mooring systems
multiline
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