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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
November 1-3, 2011
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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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Quantify Loads on Mooring
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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Quantify Loads on Mooring
ORCAFlex
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ORCAFlex Inputs
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Quantify Loads on Mooring
Scale model testing
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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
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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
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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
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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
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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