Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena最新文献

{"title":"A MODEL FOR ESTIMATING THREE-DIMENSIONAL BOUNDARY LAYERS IN ROTATING DUCT FLOW AT HIGH ROTATION RATES","authors":"J. Pallarés, F. Grau, L. Davidson","doi":"10.1615/tsfp2.600","DOIUrl":"https://doi.org/10.1615/tsfp2.600","url":null,"abstract":"Numerical simulations of flow in a rotating square duct at high rotation rates are presented. Computation and analysis of the different terms of the averaged momentum budget near the sidewalls have shown the dominant mechanisms of momentum transfer in these regions. A model for the velocities has been developed by analytically solving simplified versions of these budgets within the lateral three-dimensional boundary layers. The resulting predictions of the velocity profiles and the boundary layer quantities are in good agreement with present numerical results.","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"7 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132273771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OSCILLATORY, CHAOTIC AND TURBULENT THERMOCAPILLARY CONVECTIONS IN A HALF-ZONE LIQUID BRIDGE","authors":"H. Kawamura, I. Ueno, Shiho Tanaka, D. Nagano","doi":"10.1615/tsfp2.2260","DOIUrl":"https://doi.org/10.1615/tsfp2.2260","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121505679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"QUASI-PERIODIC GENERATION OF COHERENT VORTICAL STRUCTURES BEHIND A SURFACE-MOUNTED OBSTACLE","authors":"T. Baur, Joachim von Lukowicz, J. Köngeter","doi":"10.1615/tsfp2.1240","DOIUrl":"https://doi.org/10.1615/tsfp2.1240","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115318715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NUMERICAL INVESTIGATION OF THE SEPARATED FLOW OVER A SMOOTHLY CONTOURED RAMP","authors":"B. Wasistho, K. Squires","doi":"10.1615/tsfp2.2310","DOIUrl":"https://doi.org/10.1615/tsfp2.2310","url":null,"abstract":"Large Eddy Simulation (LES) and ReynoldsaveragedNavier-Stokes(RANS)calculationshave been used to predict the development, separation, reattachmentand downstreamrecovery of the flow over a smoothlycontouredramp. The statisticallytwo-dimensionalupstreamflow separatesalong the ramp surfaceand then reattaches downstreamon a flat section. A canonicalflatplate turbulent boundary layer at a momentum thicknessReynolds number1100, and having a boundarylayer thickness , is introduced four ramplengthsupstreamof theonsetof curvature. Subgrid-scale(SGS)stressesin theLES are closedusingthedynamiceddyviscositymodelof Germanoet al. (1991). RANS calculationsof the steady-statesolutionareperformedusingtwo leading models: Spalart-Allmaras(Spalart-Allmaras 1994) and (Durbin 1991). Mean flow predictionsobtainedusingall the modelsagreewell with theexperimentalmeasurements of Songet al. (2000). Boundarylayer detachment occursalong the curved section( ) with reattachmentat roughly . Theprimary turbulent shearstresssharplyincreasesin theseparated region andLES predictionsof theshearstressdevelopmentareaccurate.RANS estimationsof the shearstressarebelow thedatain theseparatedregion,thoughreasonablefurtherdownstream. INTRODUCTION AND OBJECTIVES Separatedboundary layers are a challenging subsetof flows that may be generallyclassified as ‘non-equilibrium’. Non-equilibriumboundary currentaddress:Centerfor Simulationof AdvancedRockets,Universityof Illinois, Urbana,Illinois 61801,USA layersarethe norm, ratherthanthe exception,in engineeringapplications.Theimportanceof additional lengthscalesto describingtheflow and/ora significantimbalancebetweenproductionanddissipationaretwo featureswhich characterizethese flows. An adverse pressuregradient boundary layer approachingseparationdevelops an inflection point, the height of which is an additional importantlengthscale.Turbulentstresses, for example,develop large peaksaroundthe inflection point andboundarylayerrecovery following reattachmentshouldbeexpectedto besensiti ve to this lengthscale. Theseandotherfeaturesof separatedflowssubstantiallychallengepredicti ve methods.The vast majority of engineeringpredictionsare obtained from solutionsof the Reynolds-averagedNavierStokes (RANS) equations.In flows not far from equilibrium, the boundaryconditionsthat define largescalestructuresremainnearlyunchangedand theleadingRANSmodelsaretypically adequate. In separatedflows, however, RANS models often yield mixed results (e.g., see Apsley and Leschziner1999),providing onerationalefor use of techniquessuch as Large Eddy Simulation (LES). In LES,thelarge,energy-containingscales of motion areresolved on the meshandonly the small, subgridscalesare modeled. LES predictionsarelesssensiti veto modelingerrorsthantheir RANS counterparts. This featureshouldbeanadvantagein predictionof flows far from thecalibration rangeof RANS modelsand in regimeswith multiple perturbations(e.g., in pressuregradient, streamlinecurvature,roughness, etc.). Assessment of s","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125311244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE SHEAR LAYERS OF A 2D JET EXCITED BY SMALL FLEXIBLE WIRES","authors":"M. Yu, C. Tseng","doi":"10.1615/tsfp2.1700","DOIUrl":"https://doi.org/10.1615/tsfp2.1700","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128376850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TURBULENCE EFFECT ON THE STABILISATION REGIMES OF NON-PREMIXED FLAMES","authors":"I. Esquiva-Dano, D. Escudié","doi":"10.1615/tsfp2.210","DOIUrl":"https://doi.org/10.1615/tsfp2.210","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129886753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SIMULATION OF A TURBULENT FLOW IN A ROTATING PIPE USING THE STRUCTURE-BASED MODEL","authors":"S. Poroseva, S. Kassinos, C. A. Langer, W. Reynolds","doi":"10.1615/tsfp2.1880","DOIUrl":"https://doi.org/10.1615/tsfp2.1880","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129569029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A SPATIAL STRUCTURE OF A FLOW OF AXISYMMETRIC SUDDEN EXPANSION","authors":"N. Furuichi, Yasushi Takeda, M. Kumada","doi":"10.1615/tsfp2.2330","DOIUrl":"https://doi.org/10.1615/tsfp2.2330","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129995988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INVARIANT ASSUMPTION OF PDF PROFILES IN THE LOG-LAW REGION IN SMOOTH AND ROUGH WALL TURBULENT BOUNDARY LAYERS","authors":"Y. Tsuji, K. Miyachi, I. Nakamura","doi":"10.1615/tsfp2.1590","DOIUrl":"https://doi.org/10.1615/tsfp2.1590","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128115795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TURBULENT STRUCTURES IN OPEN-CHANNEL FLOWS WITH STRONG UNSTEADINESS","authors":"I. Nezu, K. Onitsuka","doi":"10.1615/tsfp2.570","DOIUrl":"https://doi.org/10.1615/tsfp2.570","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126473829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}