Document Detail


Characteristics of the turbulence in the flow at a tidal stream power site.
MedLine Citation:
PMID:  23319707     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
This paper analyses a set of velocity time histories which were obtained at a fixed point in the bottom boundary layer of a tidal stream, 5 m from the seabed, and where the mean flow reached 2.5 m s(-1). Considering two complete tidal cycles near spring tide, the streamwise turbulence intensity during non-slack flow was found to be approximately 12-13%, varying slightly between flood and ebb tides. The ratio of the streamwise turbulence intensity to that of the transverse and vertical intensities is typically 1 : 0.75 : 0.56, respectively. Velocity autospectra computed near maximum flood tidal flow conditions exhibit an f(-2/3) inertial subrange and conform reasonably well to atmospheric turbulence spectral models. Local isotropy is observed between the streamwise and transverse spectra at reduced frequencies of f>0.5. The streamwise integral time scales and length scales of turbulence at maximum flow are approximately 6 s and 11-14 m, respectively, and exhibit a relatively large degree of scatter. They are also typically much greater in magnitude than the transverse and vertical components. The findings are intended to increase the levels of confidence within the tidal energy industry of the characteristics of the higher frequency components of the onset flow, and subsequently lead to more realistic performance and loading predictions.
Authors:
I A Milne; R N Sharma; R G J Flay; S Bickerton
Related Documents :
17592787 - Acute phase proteins as biological markers of negative psychopathology in paranoid schi...
23793507 - A new on-chip whole blood/plasma separator driven by asymmetric capillary forces.
23228917 - Are axial and radial flow chromatography different?
24191337 - Review: mercury exposure of gold mining workers in the northwest of iran.
10503777 - The opioid peptide analog d-ala2-met-enkephalinamide decreases bile flow by a central m...
7585687 - Intraoperative monitoring of cerebral blood flow during ventricular shunting in hydroce...
Publication Detail:
Type:  Journal Article     Date:  2013-01-14
Journal Detail:
Title:  Philosophical transactions. Series A, Mathematical, physical, and engineering sciences     Volume:  371     ISSN:  1364-503X     ISO Abbreviation:  Philos Trans A Math Phys Eng Sci     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-15     Completed Date:  2013-02-21     Revised Date:  2013-04-24    
Medline Journal Info:
Nlm Unique ID:  101133385     Medline TA:  Philos Trans A Math Phys Eng Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  20120196     Citation Subset:  -    
Affiliation:
Department of Mechanical Engineering, The University of Auckland, Auckland 1142, New Zealand. imil015@aucklanduni.ac.nz
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Assessment of arrays of in-stream tidal turbines in the Bay of Fundy.
Next Document:  Modelling of the flow field surrounding tidal turbine arrays for varying positions in a channel.