Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena最新文献_第7页

Implicit large eddy simulations with a high-order TENO scheme 高阶TENO格式的隐式大涡模拟

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.570

Lin Fu, Xiangyu Y. Hu, N. Adams

{"title":"Implicit large eddy simulations with a high-order TENO scheme","authors":"Lin Fu, Xiangyu Y. Hu, N. Adams","doi":"10.1615/tsfp10.570","DOIUrl":"https://doi.org/10.1615/tsfp10.570","url":null,"abstract":"Although TENO schemes, proposed by Fu et al. (2016), show promising results for turbulence reproduction, they are unsuitable to function as a reliable subgrid LES model by generating excessive dissipation. Meanwhile, the state-ofthe-art implicit LES models, e.g. the localized artificial diffusivity scheme by Kawai et al. (2010), typically depend on shock sensors, which are case-dependent and fail to retain the monotonicity near discontinuities. The difficulty locates on scale-separating the low-wavenumber smooth regions, high-wavenumber fluctuations and discontinuities sufficiently and incorporating adequate dissipation into numerical schemes correspondingly. In this paper, we propose a new 8-point 6th-order TENO8-A scheme, which is motivated for gas dynamics and physics-consistent for incompressible and compressible turbulence modeling. While the low-wavenumber smooth region is handled by the optimized linear scheme, with the measurement of local flow scales, the high-wavenumber fluctuations and discontinuities are predicted with adaptive nonlinear dissipation. The new scheme is Galilean invariant and free from physics-based sensors rendering its high generality. Benchmark simulations demonstrate that, while the TENO8-A scheme exhibits exceptional performance in gas dynamics, it faithfully reproduces the kinetic energy evolution for incompressible turbulence and predicts the vorticity, entropy and acoustic modes as good as the physics-motivated ILES models for compressible turbulence decay. REFERENCES Fu, Lin, Hu, Xiangyu Y & Adams, Nikolaus A 2016 A family of high-order targeted eno schemes for compressible-fluid simulations. Journal of Computational Physics 305, 333–359. Kawai, Soshi, Shankar, Santhosh K & Lele, Sanjiva K 2010 Assessment of localized artificial diffusivity scheme for large-eddy simulation of compressible turbulent flows. Journal of Computational Physics 229 (5), 1739–1762.","PeriodicalId":266791,"journal":{"name":"Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena","volume":"126 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":"115463205","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}

引用次数: 4

INFLUENCE OF LARGE-SCALE LOW- AND HIGH-SPEED STRUCTURES ON A TURBULENT BOUNDARY LAYER 大尺度低速和高速结构对湍流边界层的影响

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.250

Jinyul Hwang, H. Sung

{"title":"INFLUENCE OF LARGE-SCALE LOW- AND HIGH-SPEED STRUCTURES ON A TURBULENT BOUNDARY LAYER","authors":"Jinyul Hwang, H. Sung","doi":"10.1615/tsfp10.250","DOIUrl":"https://doi.org/10.1615/tsfp10.250","url":null,"abstract":"Direct numerical simulation data of a turbulent boundary layer (Reτ ≈ 1000) are used to explore the influences of large-scale structures on the near-wall vortical motions. The large-scale streamwise velocity fluctuations (ul) are extracted by employing a spanwise wavelength filter (λz/δ > 0.5). The r.m.s. of the streamwise swirling strength (λx) is conditionally sampled as a function of the strength of ul. The streamwise swirling strength is attenuated or amplified under the negativeor positive-ul events in the nearwall region, respectively. The asymmetric influence of the large scales on the near-wall region is due to the associated spanwise motions within the footprints of ul, i.e., the congregative and dispersive motions induced by the outer large-scale low(ul < 0) and high-speed structures, respectively (Hwang et al. 2016). The dispersive motions are more intense than the congregative motions because the positive-ul motions toward the wall (sweep) lead to an enhancement of the spanwise momentum. Conditionally averaged velocity fields associated with the vortical structures under the footprints show that the modulated swirling motions lie within the congregative and dispersive motions. The intense dispersive motions under the positive-ul event strengthen the smallscale spanwise velocity fluctuations (ws) close to the wall compared to ws associated with the attenuated vortical motions under the congregative motion. In addition, the wall-normal velocity components around the near-wall swirling motions are attenuated or amplified, which is attributed to the modulation of λx on the large scales. We quantify the contribution of the modulated vortical motions to the skin friction by employing the decomposition method of Yoon et al. (2016). The velocity-vorticity correlation","PeriodicalId":266791,"journal":{"name":"Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena","volume":"66 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":"131366462","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}

引用次数: 0

On the scaling of turbulent asymptotic suction boundary layers 湍流渐近吸力边界层的标度问题

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.1070

Marco Ferro, B. Fallenius, J. Fransson

引用次数: 2

COMPUTATION OF WALL PRESSURE SPECTRA FROM CFD RANS SOLUTIONS INDUCED BY INCOMPRESSIBLE TURBULENT BOUNDARY LAYERS 用CFD计算不可压缩湍流边界层引起的壁面压力谱

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.680

M. Slama, C. Leblond, P. Sagaut

引用次数: 0

THE EFFECT OF FLOW RATE, HEAD POSITION, AND INHALER ORIENTATION ON THE AIRFLOW AND PARTICLE DEPOSITION IN AN MRI-BASED MOUTH-THROAT GEOMETRY 流量、头部位置和吸入器方向对基于mri的口-喉几何结构中的气流和颗粒沉积的影响

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.390

F. Stylianou, S. Angeli, S. Kassinos, Mårten Svensson

引用次数: 2

Direct numerical simulation of a turbulent curved pipe flow with a 90° bend 90°弯管湍流流动的直接数值模拟

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.920

Yongmann M. Chung, Zhixin Wang

引用次数: 3

Inferring the structural properties of eddies in the log layer from spectral statistics 利用谱统计推断测井层涡旋的结构性质

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.1110

L. Agostini, M. Leschziner

引用次数: 0

Direct Numerical Simulation of Shock-Induced Drop Breakup with a Sharp-Interface-Method 基于sharp - interface的冲击跌落破碎直接数值模拟

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.490

J. Kaiser, S. Adami, N. Adams

{"title":"Direct Numerical Simulation of Shock-Induced Drop Breakup with a Sharp-Interface-Method","authors":"J. Kaiser, S. Adami, N. Adams","doi":"10.1615/tsfp10.490","DOIUrl":"https://doi.org/10.1615/tsfp10.490","url":null,"abstract":"We present twoand three-dimensional numerical results of the shock-induced breakup of a liquid droplet in air. We apply a conservative interface interaction model for sharp-interface representation and a block-based multi-resolution scheme to adaptively refine our mesh. Numerical modeling effects, such as the flux reconstruction scheme and the use of a scale separation model, that treats non-resolved interface segments, are investigated. Similarly as a previous study (Meng, 2016), we identify two dominant mechanisms of droplet breakup at certain Mach numbers flattening of the droplet and sheet stripping occurring simultaneously and influencing each other in our simulations. Three-dimensional simulations show the flattening mechanism and the mushroom-like deformation of the droplet. They also explain the occurrence of a recirculation zone in the droplet wake. The two-dimensional simulations already exhibit the sheet stripping mechanism, which occurs during and after droplet flattening. Small sheets emerge from both the upstream and the downstream side of the water column, while the main sheet develops at the droplet equator.","PeriodicalId":266791,"journal":{"name":"Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena","volume":"21 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":"124636121","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}

引用次数: 3

Reappraisal of the asymptotic state of a zero pressure gradient turbulent boundary layer 零压力梯度湍流边界层渐近状态的再评价

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.260

L. Djenidi, K. Talluru, R. Antonia

引用次数: 0

Volume 2The Structure Of Turbulent Flows In Wind Farms 卷2紊流在风电场的结构

Proceeding of Tenth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI: 10.1615/tsfp10.630

C. Meneveau

{"title":"Volume 2The Structure Of Turbulent Flows In Wind Farms","authors":"C. Meneveau","doi":"10.1615/tsfp10.630","DOIUrl":"https://doi.org/10.1615/tsfp10.630","url":null,"abstract":"In this presentation we provide an overview of our current understanding of the flow structure and turbulence in the wind turbine array boundary layer (WTABL). This particular type of shear flow develops when the atmospheric boundary layer interacts with an array of large wind turbines (Calaf et al. 2010, Cal et al. 2010, Stevens & Meneveau 2017). We distinguish between developing and fully developed WTABL and perform a series of Large Eddy Simulations that represent the turbines as actuator disks (see Figure 1 below). Salient LES results are synthesized in order to develop simplified analytical models needed for wind farm design and optimization. There one encounters the dichotomy of modeling individual turbine wakes or to model the wind farm flow as a boundary layer over a roughened surface whose properties depend upon the wind farm array. The coupled wake boundary layer model (Stevens et al. 2016a) attempts to match these two approaches iteratively. Ultimately, such models can lead to improved estimation of optimal wind turbine spacing including costs associated with covered surface, cabling and operation & maintenance (Stevens et al. 2016b). We also present new results on the temporal variability of wind power as measured in a wind tunnel experiment (Bossuyt et al. 2017) and its relationship to the spatio-temporal properties of turbulent boundary layers (Wilzcek et al. 2015). It turns out that as a first approximation, for situations without thermal stratification effects, one may consider the sum of turbine power to be a discrete sampling of the wavenumber-frequency spectrum of turbulent boundary layers. This model thus enables us to connect wind farm design parameters (turbine spacing, positioning, etc.) to fundamental properties of turbulent boundary layers.","PeriodicalId":266791,"journal":{"name":"Proceeding of Tenth International 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":"115821351","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}

引用次数: 0