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

{"title":"MODIFICATION OF GLOBAL PROPERTIES OF A MIXING LAYER BY OPEN/CLOSED LOOP ACTUATION","authors":"V. Parezanović, J. Laurentie, C. Fourment, L. Cordier, B. R. Noack, T. Shaqarin","doi":"10.1615/tsfp8.1510","DOIUrl":"https://doi.org/10.1615/tsfp8.1510","url":null,"abstract":"","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"45 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":"127060060","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":"PIV INVESTIGATION OF SPANWISE VARIATION IN INCIDENT SHOCK BOUNDARY LAYER INTERACTIONS","authors":"L. Campo, D. Helmer, J. Eaton","doi":"10.1615/tsfp8.540","DOIUrl":"https://doi.org/10.1615/tsfp8.540","url":null,"abstract":"Two incident shock boundary layer interactions (SBLIs) were documented using high resolution 2D particle image velocimetry (PIV). The incident shock wave for each interaction was generated using a sub-boundary layer fully spanning 20◦ compression wedge on the top wall of the test section. A relatively weak SBLI occurred when the incident shock was generated using a 1.1mm (0.20δ0) high wedge, and a stronger interaction occurred when the incident shock was generated using a 3.0mm (0.55δ0) high wedge. For each SBLI, velocity and turbulence measurements were obtained in four planes across the span of a low aspect ratio test section – one near the center of the tunnel, and three inside the side wall boundary layer. The measurements indicated strong three-dimensionality in both interactions, with the interaction strength decreasing significantly near the side walls. Both interactions show regions of intermittent flow reversal, with the maximum value approximately tripled for the interaction generated by the larger wedge. Mean flow reversal was observed near the centerplane of the stronger SBLI, but not for the weaker SBL","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"7 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":"128070722","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":"INVESTIGATION OF THE CONTINUOUS AND DISCRETE ADJOINT IN THE CONTROL OF PLANE JETS","authors":"Daniel Marinc, H. Foysi","doi":"10.1615/tsfp8.2120","DOIUrl":"https://doi.org/10.1615/tsfp8.2120","url":null,"abstract":"A comparison of the optimal control of twoand threedimensional plane jets using the continuous and discrete adjoint of the instationary Navier-Stokes equations was performed. The control aim was to reduce the sound emission in the near far-field by using a heat source actuation within the transitioning jet shear layers. The fully compressible Navier-Stokes equations were solved using dispersionrelation preserving spatial discretization schemes and a lowdissipation-dispersion Runge-Kutta scheme. The Reynolds number based on the slot diameter was set to 2000 and the Mach number to 0.9. Direct numerical as well as large-eddy simulations in two and three dimensions where performed to estimate the influence of modelling and resolution on the results. The results show a slight advantage of using the discrete adjoint, especially when handling boundary conditions, since the calculation of the gradient of the cost functional is more accurate. It is interesting, too, that the control efficiency reduces with increasing resolution and therefore dimension of the control. Reducing it by applying a selected interpolation in the control area shows an increase in efficiency and sound reduction. Introduction Optimal control of flows using the adjoint equations has become a valuable tool in fluid mechanics, with applications ranging from aerodynamic shape optimization (Kuruvila et al., 1994; Giles & Pierce, 2000; Brezillon & Gauger, 2004; Giering et al., 2005; Srinath & Mittal, 2010; Zymaris et al., 2010; Jameson & Ou, 2011) to sound reduction in compressible flows (Joslin et al., 2005; Wei & Freund, 2006; Spagnoli & Airiau, 2008; Freund, 2010; Kim et al., 2010; Rumpfkeil & Zingg, 2010; Marinc & Foysi, 2012). The principal task is to minimize a cost functional or objective (unwanted noise or drag, for example). Differential equation constraints are additionally imposed, which here consist of the primal flow equations. The minimization procedure requires the determination of the gradient of this cost functional (Gunzburger, 2002). Unfortunately, a finite difference approach requires O(n) solutions of our primal flow equations for n different design variables to obtain the gradient, which is impractical. Optimal control based on the adjoint equations on the other hand is independent of the number of design parameters. The adjoint may be calculated using two different routes. One possibility is to derive the adjoint equations analytically based on the problem describing partial differential equations (primal), before discretizing the resulting equations (“first optimize then discretize” (FOD). Alternatively, the primal flow equations are discretized first and these already discretized equations are used to determine the discrete adjoint equations (“first discretize then optimize” (FDO)). Both routes lead to different numerical results which are equal only in the limit of infinitely small grid and time steps. For a further discussion of disadvantages and advantages see","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"2022 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":"128072357","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":"PARTICLE-TURBULENCE INTERACTION IN NEAR-WALL TURBULENCE","authors":"Jung-Hoon Lee, Changhoon Lee","doi":"10.1615/tsfp8.1100","DOIUrl":"https://doi.org/10.1615/tsfp8.1100","url":null,"abstract":"","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"45 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":"127193100","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":"ROLE OF SHEAR INSTABILITIES IN THE UPPER EQUATORIAL UNDERCURRENT","authors":"H. Pham, S. Sarkar, K. Winters","doi":"10.1615/tsfp8.200","DOIUrl":"https://doi.org/10.1615/tsfp8.200","url":null,"abstract":"","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"51 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":"121543298","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":"SQUARE-FRACTAL-ELEMENT GRID-GENERATED TURBULENCE","authors":"R. J. Hearst, P. Lavoie","doi":"10.1615/tsfp8.2100","DOIUrl":"https://doi.org/10.1615/tsfp8.2100","url":null,"abstract":"","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"87 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":"122208596","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":"LARGE-EDDY SIMULATION USING THE EXPLICIT ALGEBRAIC SUBGRID MODEL IN COMPLEX GEOMETRIES","authors":"A. Rasam, S. Wallin, G. Brethouwer, A. Johansson","doi":"10.1615/tsfp8.1670","DOIUrl":"https://doi.org/10.1615/tsfp8.1670","url":null,"abstract":"In Rasam et al. (2011) we compared the performance of the explicit algebraic subgrid-scale (SGS) model (EASSM) (Marstorp et al., 2009) with that of the conventional dynamic Smagorinsky model (DSM) ...","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"100 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":"131536498","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":"SCALING EXPONENTS OF VELOCITY SPECTRA AND STRUCTURE FUNCTIONS IN THE MODERATE RANGE OF TAYLOR REYNOLDS NUMBERS IN A TURBULENT JET","authors":"H. Sadeghi, P. Lavoie, A. Pollard","doi":"10.1615/tsfp8.1180","DOIUrl":"https://doi.org/10.1615/tsfp8.1180","url":null,"abstract":"","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"6 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":"124672952","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":"CHARACTERIZATION OF THE FLOW OVER PERIODIC HILLS WITH ADVANCED MEASUREMENT AND EVALUATION TECHNIQUES","authors":"C. Cierpka, S. Scharnowski, C. Kähler, M. Manhart","doi":"10.1615/tsfp8.590","DOIUrl":"https://doi.org/10.1615/tsfp8.590","url":null,"abstract":"","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"131 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":"124717646","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":"FLAME HOLDING DYNAMICS DURING COMBUSTION INSTABILITY IN A SHEAR-COAXIAL INJECTOR COMBUSTOR","authors":"Nicolas Guezennec, T. Dawson, P. Sierra, S. Menon","doi":"10.1615/tsfp8.150","DOIUrl":"https://doi.org/10.1615/tsfp8.150","url":null,"abstract":"","PeriodicalId":206337,"journal":{"name":"Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena","volume":"117 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":"122326447","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}