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Evan Greer,Mentor: Dr. Marcelo Kobayashi,HARP REU ProgramAugust 2, 2012Contact: [email protected]
globalwindgroup.com
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Introduction and Motivations Creating the geometry
Stationary study of turbine geometry Rotating study of turbine geometry Future Plans Acknowledgements
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Energy Security
High reliability of fossil fuels leads to widespread use
Set amount of fossil fuel outputs a setamount of energy
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Introduction of reliability to renewableresources, wind energy in particular
Wind energy is subject to low reliability dueto changing weather conditions
Scale predictions of large scale weatherpatterns to make predictions about theenvironment around the turbine
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The effects of local topography on efficiencywill be studied
WRF (weather research and forecasting)model coupled with CFD models
This is the future goal of this research but firsta working model of the turbine must becreated and studied
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Used a sample geometry fromComsol Multiphysics
Played with initial conditions
and mesh sizes Learned how to use the Comsol
Multiphysics software
Studied introductory tutorialbuilding a busbar geometry
Learned how to set up fluid flowand thermoelectric physics
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Approximated the geometry of atypical wind turbine
Height of the tower set at 300 ft
Length of the rotors set at 200 ft
Length of the nacelle set at 40 ft
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Front View Side View
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Created for theimplementation of the slidingmesh
Cylindrical region with aheight of 80 ft encompassingthe blades
Domain to move with the
blades
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Region where boundaryand initial conditions are tobe defined
Created a cylindricalregion behind the slidingregion to study wake
Material for the flow setas air and material forturbine set as aluminum
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Generated mesh usingtetrahedral elements
Mesh had to be refinedaround blades
Mesh consisted of 93349elements
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Ran a stationary turbulent flow study using ak-model
This model has the purpose of understandinghow fluid flow is affected by geometry
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Used a simple turbulent flow physical model
Stationary study step with no timedependence
Inlet velocity of 3.219 m/s, this is the averageannual wind speed of Honolulu reported byNOAA [1]
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Outlet condition was also set to atmosphericpressure
Also, a volume force was introduced on theflow domain
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Used Rotating Machinery,Turbulent Flow physical model
Moving domains are coupledwith stationary domains by
identity pairs
At these identity pairs, a fluxcontinuity boundary conditionis applied
Navier-Stokes equations areformulated based on rotatingand stationary coordinatesystems
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Convergence of time stepped solution
Solution would get stuck on calculation oftime step
Many issues with script files and runs onsupercomputer
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Issues with licensing Jobs would terminate because of lack of licensing on
multiple nodes
Solved with batch and cluster computing add-on tojob configurations within Comsol
Issues with node communication Comsol would get kicked nodes
Solved using MPD (Multi processing Daemon) used byComsol to communicate between nodes
Accomplished through modification of script files withthe help of Andrew Yukitomo
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Isolated rotatinggeometry
Try to get rotatingblade workingwithout pairing
Added input andoutput condition
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Added pairing and flowcontinuity conditionbetween stationary and
rotating domains
Used overlapping domainsand input and outputconditions
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Used non-overlappingdomains
Got rid of input and outputconditions, instead used apressure point constraint
Increased number of
iterations used by the solver
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Complete the set up of the full rotatinggeometry
Get the blade study to run for larger time scales Further work needs to be done to understand where
and why the convergence errors are occurring
Understanding how to make a more accurate mesh
Introduce the stationary wake region and a twodimensional pairing region
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Introduce the flow domain and threedimensional pairing and get the complete
model to run
Get the rotation of the turbine to be dictatedby inlet velocity conditions
This will involve delving deeper into the interfaceto understand how to program physical models
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Project benchmarks:
Creating geometry
Modeling stationary case Implementation of sliding mesh
Implementation of Large Eddy Simulation
Implementation of WRF data This research will be continued under a NASA
space grant in the fall
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I would like to thank Dr. Susan Brown for giving methe opportunity to be a part of this program and Dr.Marcelo Kobayashi for his continued support andallowing me to share in his research. I also want to
acknowledge Andrew Yukitomo for his continued helpwith script files and supercomputing issues and HOSCfor allowing us to use the supercomputing facilities forour work.
"This material is based upon work supported by the National ScienceFoundation under Grant No. 0852082. Any opinions, findings, andconclusions or recommendations expressed in this material are those of theauthor(s) and do not necessarily reflect the views of the National ScienceFoundation."
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[1] Delliger, Dan, 2008, Average Wind Speed, Comparative Climate Data,http://lwf.ncdc.noaa.gov/oa/climate/online/ccd/avgwind.html(July 5, 2012)
[2] Laminar Flow in a Baffled Stirred Mixer. Comsol Multiphysics 4.3 sampleprogram documentation, 2012
http://lwf.ncdc.noaa.gov/oa/climate/online/ccd/avgwind.htmlhttp://lwf.ncdc.noaa.gov/oa/climate/online/ccd/avgwind.htmlTop Related