Wall Modeled Large-Eddy Simulations in Rotating Systems for Applications to Turbine Blade Internal Cooling

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dc.contributor.authorSong, Keun Minen
dc.contributor.committeechairTafti, Danesh K.en
dc.contributor.committeememberPaul, Mark R.en
dc.contributor.committeememberEkkad, Srinath V.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:31:12Zen
dc.date.adate2012-02-16en
dc.date.available2014-03-14T20:31:12Zen
dc.date.issued2012-01-20en
dc.date.rdate2012-02-16en
dc.date.sdate2012-01-30en
dc.description.abstractLarge-Eddy Simulations (LES or wall-resolved LES, WRLES) has been used extensively in capturing the physics of anisotropic turbulent flows. However, near wall turbulent scales in the inner layer in wall bounded flows makes it unfeasible for large Reynolds numbers due to grid requirements. This study evaluates the use of a wall model for LES (WMLES) on a channel with rotation at ã Reã _b = 34,000 from ã Roã _b = 0 to 0.38, non-staggered 90° ribbed duct with rotation at ã Reã _b = 20,000 from ã Roã _b = 0 to 0.70, stationary 45° staggered ribbed duct at ã Reã _b = 49,000, and two-pass smooth duct with a U-bend at ã Reã _b = 25,000 for ã Roã _b = 0 to 0.238 against WRLES and experimental data. In addition, for the two-pass smooth duct with a U-bend simulations, the synthetic eddy method (SEM) is used to artificially generate eddies at the inlet based on given flow characteristics. It is presented that WMLES captures the effects of Coriolis forces and predicts mean heat transfer augmentation ratios reasonably well for all simulations. The alleviated grid resolution for these simulations indicates significant reductions in resources, specifically, by a factor of 10-20 in non-staggered 90° ribbed duct simulations. The combined effects of density ratio, Coriolis forces, with SEM for the inlet turbulence, capture the general trends in heat transfer in and after the bend.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-01302012-154202en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01302012-154202/en
dc.identifier.urihttp://hdl.handle.net/10919/31080en
dc.publisherVirginia Techen
dc.relation.haspartSong_KM_D_2012.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectHeat transferen
dc.subjectLarge Eddy Simulationen
dc.subjectRotationen
dc.subjectTurbine blade internal coolingen
dc.subjectWall layer modelingen
dc.titleWall Modeled Large-Eddy Simulations in Rotating Systems for Applications to Turbine Blade Internal Coolingen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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