{"title":"LARGE SCALE STRUCTURE AND COHERENT FINE SCALE EDDIES IN HIGH REYNOLDS NUMBER TURBULENT MIXING LAYERS","authors":"Shiki Iwase, M. Tanahashi, T. Miyauchi","doi":"10.1615/tsfp2.1850","DOIUrl":"https://doi.org/10.1615/tsfp2.1850","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"81 4 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":"127459660","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}
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.
{"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":"FULL WAY COUPLING OF LARGE EDDY SIMULATION FOR PARTICLE-LADEN TURBULENT FLOWS USING NEW DYNAMIC SGS MODELS","authors":"K. Lei, N. Taniguchi, Toshio Kobayashi","doi":"10.1615/tsfp2.920","DOIUrl":"https://doi.org/10.1615/tsfp2.920","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"22 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":"131552948","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 LAW-OF-THE-WAKE FOR THE REYNOLDS STRESS IN A BOUNDARY LAYER","authors":"R. Panton","doi":"10.1615/tsfp2.1490","DOIUrl":"https://doi.org/10.1615/tsfp2.1490","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"36 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":"132826342","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":"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}
T. Craft, A. Gerasimov, H. Iacovides, B. Launder, C. Robinson
{"title":"A NEW WALL FUNCTION STRATEGY FOR FORCED AND MIXED CONVECTION","authors":"T. Craft, A. Gerasimov, H. Iacovides, B. Launder, C. Robinson","doi":"10.1615/tsfp2.360","DOIUrl":"https://doi.org/10.1615/tsfp2.360","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"206 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":"134130444","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}
Markus Hogberg, T. Bewley, M. Berggren, D. Henningson
Using two diierent approaches to optimal control in channel ow an eeort is made to try to identify diierences and similarities. One approach is to use the Navier{Stokes equations and apply a gradient based optimization technique to nd the optimal control. The other approach is to make use of the linearized equations known as the Orr{Sommerfeld{Squire equations to compute the optimal control. Limiting ourselves to look only at oblique wave perturbations we compare the resulting energy evolution from application of the respective control strategies. Qualitatively the performance of the two approaches are similar, at least when they work under comparable conditions. The non-linear control can be more aggressive initially since there is no direct limitation on the time derivative of the control even though the discretization implicitly enforces some degree of penalty. Adjusting the parameters properly we can show that the control from the two approaches are very similar. Also we try to quantify the performance of the estimator based control, or compensation, using only measurements on the wall, compared to the full-state information control. The performance of the compensator is found to be good for small perturbations, especially if a good initial guess can be provided.
{"title":"OPTIMAL CONTROL OF TRANSITION INITIATED BY OBLIQUE WAVES IN CHANNEL FLOW","authors":"Markus Hogberg, T. Bewley, M. Berggren, D. Henningson","doi":"10.1615/tsfp2.260","DOIUrl":"https://doi.org/10.1615/tsfp2.260","url":null,"abstract":"Using two diierent approaches to optimal control in channel ow an eeort is made to try to identify diierences and similarities. One approach is to use the Navier{Stokes equations and apply a gradient based optimization technique to nd the optimal control. The other approach is to make use of the linearized equations known as the Orr{Sommerfeld{Squire equations to compute the optimal control. Limiting ourselves to look only at oblique wave perturbations we compare the resulting energy evolution from application of the respective control strategies. Qualitatively the performance of the two approaches are similar, at least when they work under comparable conditions. The non-linear control can be more aggressive initially since there is no direct limitation on the time derivative of the control even though the discretization implicitly enforces some degree of penalty. Adjusting the parameters properly we can show that the control from the two approaches are very similar. Also we try to quantify the performance of the estimator based control, or compensation, using only measurements on the wall, compared to the full-state information control. The performance of the compensator is found to be good for small perturbations, especially if a good initial guess can be provided.","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"1123 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133842890","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":"HEAT TRANSFER IN TWO-PHASE IMPINGING JETS","authors":"K. Cannevière, J. Réveillon, C. Canton-Desmeuzes","doi":"10.1615/tsfp2.890","DOIUrl":"https://doi.org/10.1615/tsfp2.890","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"53 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":"123917487","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":"CIRCULATION TIME HISTORY AND ONSET OF THREE-DIMENSIONAL VORTEX SHEDDING IN THE WAKE BEHIND A DISK","authors":"H. Higuchi, H. Balligand","doi":"10.1615/tsfp2.500","DOIUrl":"https://doi.org/10.1615/tsfp2.500","url":null,"abstract":"","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"455 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":"127609435","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}
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