Design and validation challenges of floating foundations ... · Design and validation challenges of...

Design and validation challenges of floating foundations: Nautilus 5MW case

Iñigo MendikoaResearch Engineer

IndexTecnalia Research&Innovation

Floating Offshore Wind

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Nautilus concept

Technical challenges

R&D Activities

Wind Energy Denmark, Herning, Oct 2nd 2017

6 INTERCONNECTED BUSINESS DIVISIONSThis way of working is the bestexample of our innovative spiritapplied to an operational model, where cooperation worksthanks to the transversality of teams, projects and clients.

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Tecnalia Research&InnovationOrganisation


PEOPLE

IN TECNALIA

1,405 STAFF

57 %MEN 43 %

WOMEN

30DIFFERENTNATIONALITIES

102,1 M€ INCOME

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Figures on 31 December 2016

Tecnalia Research&InnovationMain figures in 2016

Wind Energy Denmark, Herning, Oct 2nd 2017 5

• 2004: ‘Marine Renewable Energy’ department creation.• 2009: Floating Offshore Wind team creation.• From 2012: Over 20 members with expertise in naval architecture, aerodynamics,

hidrodynamics and structural design.

Tecnalia Research&InnovationOffshore Renewable Energy


Tecnalia Research&InnovationFloating Offshore Wind

• Coupled models for floating offshore wind platform design and

optimization.

• Models validations through experimental testing.

• Mooring systems design.

• Experimental analysis of mooring components (Chain/Umbilical

cable).


FAST AND ORCAFLEX COUPLING METHODOLOGY

Tecnalia Research&InnovationCoupled models for Floating Offshore Wind


▪ Chain fatigue analysis (Vicinay)

▪ 400-ton fatigue test bench for characterization of fatigue behavior of mooring chains in seawater (Chain sizes: 70 mm to 180 mm).

▪ Umbilical cable bending fatigue test

▪ Up to 11m long cables at max 0.2Hz.

Tecnalia Research&InnovationMooring testing at Tecnalia


• Limited shallow water locations.

• Most of the resource is in deep waters and less turbulence.

• Reduced environmental impact.

• Huge potential around the world.

• Access to markets without extended continental shelf –USA,

Japan, Norway, Spain, Portugal,…

• Even in the North sea there are areas with high wind resource

in deep waters.

• Coastal areas with high energy demand.

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Floating Offshore WindReasons to go deeper


Floating Offshore WindTechnologic approaches


• Onshore wind turbine assembly.

• No special/custom made means are necessary for load out and towing.

• Reduced draft allows to transit shallow waters.

• Well-known technology in O&G industry.

• Low frequency movements.

• Simple and reliable mooring system installation.

• Tidal level insensitivity.

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NAUTILUS conceptBenefits from semi-submersible


NAUTILUS conceptSize comparison

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• Four-columns semisubmersible steel structure.

• Passive ballast / Active water ballast.

• Standard catenary mooring.

NAUTILUS conceptMain features


NAUTILUS conceptFeatures and Advantages

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NAUTILUS conceptBasic platform design flowchart

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Operational Survival

Hs=1,88 Tp=9,15 Vw=11,5 Hs=14,12 Tp=15 Vw=50 Vc=0,9

Displacements Displacements

Axis Static Peak to Peak Static Peak to Peak

X (m) 9,71 4,38 m 8,51 6,31

Z (m) 86,50 0,47 m 89,00 5,34

Pitch (º) -0,76 3,01 -0,71 3,56

Acceleration Acceleration

Axis Static Max Static Max

X (m/s2) 0,20 0,65 0,46 1,47

Z (m/s2) 0,09 0,29 0,47 1,41

Pitch (deg/s2) 0,12 0,47 0,27 0,90

Mooring Loads Mooring Loads

Line Static Peak to Peak Static Peak to Peak

L1 (+) 91,35 Tm 5,55 Tm 82,39 Tm 86,80 Tm

L3 (-) 32,21 Tm 1,46 Tm 35,73 Tm 10,45 TmPitch angle < 2 degree

Max acceleration < 2,5 m/s2

NAUTILUS conceptTank testing


• Wind Turbine:

– Need to develop turbine designs specifically for floating structures (control, motion limits).

• Foundation Structure:

– Support structures for current demonstration projects have not been fully optimised.

– Behaviour of structure poorly understood due to lack of operational experience.

– Shipyards not equipped for serial production, leading to uncertainty in costs.

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Technical Challenges (I)


• Moorings:

– Poor understanding of the dynamic behaviour of moorings.

– Cost of anchors and their installation is high.

• Electrical Infrastructure:

– Lack of experience with dynamic power cables and substations.

• Design:

– Software tools simulating the whole system behaviour are not fully validated.

• Installation & Maintenance:

– Distance and environmental conditions limit inspection and maintenance.

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Technical Challenges (II)


H2020 SME Instrument• New Floating Platform for offshore wind

in deep waters• Phase 1 awarded• EU contribution: 50.000 €

H2020 – LCE2: EERA Wind LIFES 50+ Project

• Optimize and qualify to a TRL 5, of two innovative substructure designs for 10MW turbines

• Budget: 7.3 MM€

DNV-GL Joint Industry Project

• Coupled Dynamic Analysis of Floating Wind Turbines

HAZITEK 2016 – Basque Country

• Development of a Structure for Floating Offshore Wind

• Budget: 210 k€

CDTI – CIEN: FLOCAN2GRID

• New Solutions for Innovative Platforms and Technologies associated to the evacuation and network integration of Floating Offshore Wind Farms.


SODERCAN: I+C=+C

• SAFE: Development of a Motion Compensated Gangway to Access Marine Energy devices


R&D ActivitiesParticipation in Regional, National and European R&D Projects


Objectives:• Optimize and qualify to a TRL 5, of two innovative

substructure designs for 10MW turbines• Develop a streamlined KPI based methodology for

the evaluation and qualification process of floating substructures

Focus:• Floating wind turbines installed in water depths

from 50m to 200m• Offshore wind farms of large wind turbines

(10MW) – identified to be the most effective way of reducing cost of energy in short term

Budget: 7.3 MM€

R&D ActivitiesH2020 – LCE2: EERA Wind LIFES 50+ Project


• Code-to-data validation of offshore wind modelling tools.

• Extension of IEA Wind Task 30: 2014-2018.

• Three phases – examinating three different systems

– Semisubmersible tested by DeepCwind in 2011 was re-

tested at MARIN in 2013 with new, better performing turbine.

OC5-DeepCWind semisubmersible 1/15

scale model, tested at MARIN. (Source: OC5 IEA project)

– Turbine is MARIN stock

turbine (NREL 5MW

scaled at 1:50).

– Series of wind/wave tests

performed.

R&D ActivitiesOC5: Offshore Code, Comparison, Collaboration, Continued, with Correlation


An industrial group dedicated to the design andconstruction of all kind of vessels

The first private R&D entity in Spainand one of the most relevant centers

in Europe. The world leader in the supply ofchains and mooring systems

for the offshore industry

An industrial group focusing its activity on engineering solutions fromconstruction to maintenance engineeringof industrial facilities

An international group that operates in the field of electrical networks,electronics and communications.

Leader in the supply ofMV cells for the offshore wind market

Collaboration agreement:

NAUTILUS Floating Solutions

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Thank you for your attention

Tecnalia Research & InnovationParque Científico y Tecnológico de Bizkaia

Edificio 700

E-48160 Derio, Bizkaia

Spain

[email protected]

mailto:[email protected]

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