1 | program name or ancillary texteere.energy.gov water power peer review benchmark modeling of the...
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1 | Program Name or Ancillary Text eere.energy.gov
Water Power Peer Review
Benchmark Modeling of the Near-field and Far-field Wave Effects of Wave Energy Arrays
Ken Rhinefrank
[Columbia Power Technologies, Inc.][[email protected]][November 2, 2011]
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2 | Program Name or Ancillary Text eere.energy.gov
Water Power Peer Review
Benchmark Modeling of the Near-field and Far-field Wave Effects of Wave Energy Arrays
Ken Rhinefrank
[Columbia Power Technologies, Inc.][[email protected]][November 2, 2011]
Project Team
Columbia Power TechnologiesKen Rhinefrank
Pukha Lenee-Bluhm
Erik Hammagren
Oregon State UniversityMerrick Haller
Tuba Oskan-Haller
Aaron Porter
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3 | Wind and Water Power Program eere.energy.gov
Purpose, Objectives, & Integration
• Numerous environmental uncertainties exist with wave energy converter designs. Such uncertainties can concern stakeholders and can to lead to a lengthy and expensive permitting process. One such concern is potential changes to the shoreline that may be caused by wave field modification induced by WEC devices.
• Numerical wave prediction models that have been thoroughly validated with detailed observations can be used to show expected physical impacts at considered sites. For example, the validated model will enable us to assess ways to mitigate any unwanted effects through modifications in the array design.
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4 | Wind and Water Power Program eere.energy.gov
Technical Approach
Project Objectives
1. Collection of a benchmark data set for testing numerical models of wave-structure interaction
2. Development of a predictive understanding of the effects of an array of wave energy converters on the wave conditions.
3. Develop a methodology for estimating the potential for arrays of wave energy converters to change the near-shore current and sediment transport patterns.
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5 | Wind and Water Power Program eere.energy.gov
Technical Approach
Key project issues and approachThe technical approach involves experimental design, setup, and testing at 1:33 scale. It also involves the development and validation of a numerical model and comparison of the numerical model with experimental results. This approach includes the following tasks
1. Experimental setup
2. Design & construction of 1:33 scale WEC array
3. Experimental tank testing of three different array configurations
4. Develop numerical model
5. Model/data comparisons
6. Develop validated parameterizations for WEC
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6 | Wind and Water Power Program eere.energy.gov
Offshore array
Wavemaker
Near-field arrayFar-field array
Technical Approach
1. Experimental setup
2. Design & construction of 1:33 scale WEC array
WEC array(Manta-33)
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7 | Wind and Water Power Program eere.energy.gov
Technical Approach
3. Experimental Tank Testing
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8 | Wind and Water Power Program eere.energy.gov
Technical Approach
4. Develop Numerical Model
SWAN modeling at lab scale
Lab data SWAN output
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9 | Wind and Water Power Program eere.energy.gov
Technical Approach
5. Model/Data Comparisons
Measured offshore and lee wave Power
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10 | Wind and Water Power Program eere.energy.gov
Technical Approach
5. Model/Data Comparisons
Preliminary Investigation Measured WEC Power vs. Measured Wave Power Loss
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11 | Wind and Water Power Program eere.energy.gov
Plan, Schedule, & Budget
Schedule
• Initiation date: January 1, 2010
• Planned completion date: December 31, 2011
– Requesting an extension to August 2012 to address the vast amounts of data that must be accurately post processed prior to finalizing the numerical models.
• Milestones
FY10 5 WEC design build test Design tank experiment Setup tank experiment and begin testing
FY11 Complete array experiment and process wave data Begin Numerical Model development
FY12 Develop Numerical Model Model Data Comparison
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12 | Wind and Water Power Program eere.energy.gov
Plan, Schedule, & Budget
• Go/no-go decision points -
FY12
– Confirm validity of model for public distribution
Budget:
• Remaining budget will be utilized during numerical model development
• 47% of budget utilized to date.
Budget History
FY2009 FY2010 FY2011
DOE Cost-share DOE Cost-share DOE Cost-share
0 0 $163,364 $0 $115,758 $0
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13 | Wind and Water Power Program eere.energy.gov
Accomplishments and Results
• Five 1:33 scale models have been designed, built and tested in the Tsunami Wave Basin
• Wave data has been post processed using proper calibration coefficients and checked for accuracy.
• Preliminary investigation of the wave buoy array effects on the near-field and far-field wave climates has been made and clear indicators of energy absorption exist.
• The remainder of the project will further develop and validate the numerical models that describe these affects on the wave climate.
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14 | Wind and Water Power Program eere.energy.gov
Challenges to Date
Quality control of hydrodynamic data has been challengingCauses: • Wave gauge calibration shift over testing period (Time-varying calibration coefficients)
due to ionization changes in the water body.• Organizational structure of the dataset remains a challenge, owing to the sheer
number of different permutations that were tested.• A large percentage (>90%) of the collected data has passed quality control.
Solutions:• Comparing the outputs of an ultrasonic wave gauge and a collocated resistance wire
wave gauge at a number of points in time, a time varying calibration coefficient function was developed.
• Continue to scrutinize, understand and process data.
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15 | Wind and Water Power Program eere.energy.gov
Challenges to Date
Different damping characteristics of the individual WECs
Causes: • Mechanical variation of damper over the test period
Solutions:• An additional round of testing was performed to fully characterize each WEC• Characterize dampers pre and post testing• Treat each WEC as a heterogeneous point absorber rather than all the same
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16 | Wind and Water Power Program eere.energy.gov
Challenges to Date
Optical clarity issues degrading the stereo-video observations
Causes: • Clear water
Solution:• Pressurized particle seeding gun was built to launch seed material into the basin
Tank resonant modes under some conditionsCauses: • Reflection from beach and side walls
Solution:• Presently being analyzed.• None-Would require substantial investment in beach and side wall energy absorption.
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17 | Wind and Water Power Program eere.energy.gov
Next Steps
Develop Numerical Model
Model/Data Comparisons
Final report