48 Mooring Project Orpc Mcentee

8/2/2019 48 Mooring Project Orpc Mcentee

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1 | Program Name or Ancillary Text eere.energy.gov

Water Power Peer Review

OCGen Module MooringProject

Jarlath McEntee

Ocean Renewable Power Company

[email protected]

November 1-3, 2011


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2 | Wind and Water Power Program eere.energy.gov

Purpose, Objectives, & Integration

Challenges At present deploying, mooring and retrieval in fast moving water requires specialized equipment

and expertise

Expensive and limited equipment

Project aims to define loadings on moored hydrokinetic structures, to develop innovative mooringsystems, and to reduce cost associated with installation and retrieval

Programs mission and objectives Better understanding of design issues

Reduced cost and improved reliability

Reduces LCOE

Transferrable to other Marine Renewable systems

How This Project will be Integrated Mooring system design integrated into ORPCs OCGen Power System projects for Maine and

Alaska (Prototypes deployed 2013)


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Technical Approach

Identify the loads acting on the mooring system Steady fluid loads

Dynamic fluid loads

Dynamic inertial loads

Scale model testing Collect geophysical and geotechnical data

Design, build and deploy field size module Design of OCGen sub-module

Design of mooring system Deployment and monitoring of system

Design, build and acquire mooring system for fullOCGen Power System


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Quantify Loads on Mooring

RANS CFD (Flow 3D) Provides steady state

lift and drag behavior

Computationally

intense


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Dynamic analysis of tethered systems University of Washington (NNMREC)

0 0 0 0 0 0 0 0 00

0

0

0

0

0

0

X (m)

Z(m)

Analytical

Numerical


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ORCAFlex


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ORCAFlex Inputs




Scale model testing



Plan, Schedule, & Budget

Schedule Initiation date: March 1, 2010

Planned completion date: August 8, 2013 This reflects an 18-month extension request due to NEPA review delay, which resulted in a schedule and space

conflict requiring the relocation of the Mooring Project to an adjacent area in Cobscook Bay, Maine.

Milestones for FY 10 and FY11 Task 1: Load Modeling Task 2: Dynamic Stability Task 3: Dynamic Analysis of Mooring System Task 4: Scale Model Testing Task 5: Geophysical Surveys (through 03/06/2012)

Go/no-go decision points for FY12 and FY13: None to date

Budget: No budget variances to date. Portion of the project budget expended to date: $276,123.78

Budget History

FY2009 FY2010 FY2011

DOE Cost-share DOE Cost-share DOE Cost-share

$0 $0 $222,274.25 $0 $53,849.53 $0



Accomplishments and Results

Successfully utilized a commercially available CFD codeto predict fluid induced loads on the OCGen module Modular, scalable modeling technique

Developed an analytical tool to predict the dynamicbehavior of a tethered floating system in transient flows

Identified limitations with a commercially availablemooring design code and found path to address these

Performed preliminary scale model tests

Now gathering the required geophysical information forthe proposed field test site, and beginning the designprocess for the field test module



Accomplishments and Results

Milestone CompletionDate

1 Load modeling July 2011

2 Dynamic Stability July 2011

3 Dynamic analysis of Mooring System July 2011

4 Scale Model Testing July 2011

5 Geophysical Surveys March 2012

6 Cable & anchor design September 2012

7 Mooring experiment October 2012

8 Design of OCGen Mooring System August 2013

9 Reporting September 2013



Challenges to Date

Understanding and providing accurate inputs for theORCAFlex code (apparent mass, etc) Investigating other analysis codes

Collecting adequate geophysical and geotechnical sitedata at a reasonable cost Working with universities and contractors to improve our

interpretation skills and to identify improved means of siteinvestigation (CPTu, etc)

Project received NEPA categorical exemption 14 monthsafter project start date. Rescheduled project activities



Next Steps

Completion of Analysis for OCGen sub-module

Design of cable and mooring system for sub-module

Field deploy, test and monitor a sub-module for 3 months(starting June 2012)

Design of a full scale mooring system for the OCGenpower system (Fall 2012)

Procurement and installation of OCGen Power System(Spring 2013)


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Next Steps

Utilization of alternative codes to Flow-3D and ORCAFlex AQWA

Need exists for a more reliable geophysical interpretationmethodology

48 Mooring Project Orpc Mcentee

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