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101.
Yinglin Li C.K. Chan Bowen Mei 《International Journal of Computational Fluid Dynamics》2015,29(3-5):272-285
This paper presents large eddy simulation (LES) results of incompressible heat and fluid flows around a square cylinder (SC) at zero incident angle at high Reynolds numbers (Re) in the range from 1.25×105 to 3.5×105. LES results are obtained on the basis of swirling strength based sub-grid model, and a higher order upwind scheme developed with respect to the Taylor expansion. It was found that, for the zero incident SC wake flows at a Reynolds number in the range {Re5 = Re/105 ∈ [1.25, 3.5]}, the Strouhal number equals to 0.1079, completely independent of the Reynolds number; the coefficient of drag is around 1.835 with an uncertainty of about 1.9%, almost non-sensitive to the Re. When Re is beyond 3.0×105, the time-averaged peak value of sub-grid viscosity is over 340, implying that the role of sub-grid model is crucial in some regions where vortex motion is active and vortex interaction is intense. The time–spanwise (t-z) averaged sub-grid viscosity ratio profiles and the profiles of fluctuations of the sub-grid viscosity ratio and velocity components at four locations downstream of the SC are presented. The fields of the t-z averaged sub-grid viscosity ratio, and the instantaneous fields of streamwise and spanwise vorticities are also reported and discussed. The predicted mean Nusselt number is compared with empirical correlations, revealing that swirling strength based LES has its potential in predicting natural and industrial flows. 相似文献
102.
In this paper, a new vector‐filtering criterion for dynamic modes selection is proposed that is able to extract dynamically relevant flow features from dynamic mode decomposition of time‐resolved experimental or numerical data. We employ a novel modes selection criterion in parallel with the classic selection based on modes amplitudes, in order to analyze which of these procedures better highlight the coherent structures of the flow dynamics. Numerical tests are performed on two distinct problems. The efficiency of the proposed criterion is proved in retaining the most influential modes and reducing the size of the dynamic mode decomposition model. By applying the proposed filtering mode technique, the flow reconstruction error is shown to be significantly reduced. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
103.
含悬浮固粒的旋转射流剪切层稳定性研究 总被引:1,自引:0,他引:1
本文在理想不可压旋转圆射流的运动方程中添加了固粒作用项,由此推得了时间增长率的表达式,进而得关于含悬浮固粒放置射流稳定性的修正瑞利稳定性准则,求出了不同固粒质量密度固-气脉动速度比值,固气脉动速度相位差及Stokes数情况下旋转射流场的增长率与径向空间波数的关系曲线,在比较这些曲线的基础上,给出了关于固粒属性对旋转射流场稳定性影响的几个重要结论为控制旋转射流场和后续发展提供了依据。 相似文献
104.
涡流管内可压缩流体强旋流的实验研究 总被引:1,自引:0,他引:1
逆流式涡流管,其切向孔进气压力、进气温度与分流系数变化时,测出涡流管中心孔流出的冷气体温度变化曲线,分析了冷气体的温度下降到摄氏零度以下的机理,得出了获得低温冷气体的条件。 相似文献
105.
An investigation on the predictive performance of four cubic eddy‐viscosity turbulence models for two strongly swirling confined flows is presented. Comparisons of the prediction with the experiments show clearly the superiority of cubic models over the linear k–εmodel. The linear k–εmodel does not contain any mechanism to describe the stabilizing effects of swirling motion and as a consequence it performs poorly. Cubic models return a lower level of Reynolds stresses and the combined forced‐free vortex profiles of tangential velocity close to the measurements in response to the interaction between swirl‐induced curvature and stresses. However, a fully developed rotating pipe flow is too simple to contain enough flow physics, so the calibration of cubic terms is still a topic of investigation. It is shown that explicit algebraic stress models require fewer calibrations and contain more flow physics. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
106.
An investigation on the predictive performance of cubic eddy‐viscosity turbulence models for strongly swirling confined flows with variable density is presented. Comparisons of the prediction with the experiments show some improvements of cubic models over the linear k–ε model. The linear k–ε model does not contain any mechanism to represent the interaction of swirl and density variation and as a consequence it performs poorly. With appropriate modelling, two‐equation cubic turbulence models can capture the subcritical nature of the flow, represent the azimuthal velocity profiles of combined forced‐free vortex motion, and predict the combined effects of swirl and density variation fairly well. However, the calibration of model coefficients is still a topic of investigation. Further amendments are also needed for the equations of k and ε to take into account the effects of swirl and density gradients correctly. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
107.
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110.
A Reynolds stress closure based on the generalized Langevin model (GLM), developed by Haworth and Pope[3,4], is applied to the flow calculation with swirl-induced recirculation. The purpose of the work is to assess the performance
of this model under the complex flow conditions caused by the presence of strong swirl which gives rise to both unconventional
recirculation in the vicinity of the symmetry axis and strong anisotropy in the turbulence field. Comparison of the computational
results are made both with the experimental data of Roback and Johnson[11] and the computational results obtained with the typical isotropization of production model (IPM) and thek-ε type Boussinesq viscosity model. 相似文献