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| 1 | AN INVESTIGATION OF TURBULENT HEAT TRANSFER IN CHANNEL FLOWS BY LARGE EDDY SIMULATION显示文摘Large Eddy Simulation (LES) of fully developed turbulent channel flow with heat transfer was performed to investigate the effects of the Reynolds number on the turbulence behavior. In the present study, the bottom wall of the channel was cooled and the top wall was heated. The Reynolds numbers, based on the central mean-velocity and the half-width of the channel, were chosen as 4000, 6000, 10 4 and 2×10 4, and the Prandtl number as 1.0. To validate our calculations, the present results were compared with available data obtained by Direct Numerical Simulation (DNS), which proves to be in good agreement with each other. To reveal the effects of the Reynolds number, some typical quantities, including the velocity fluctuations, temperature fluctuation, heat fluxes and turbulent Prandtl number, were studied. | Dong Yu-hong, Zhong Feng-quan, Lu Xi-yun, Zhuang Li-xian Department of Mechanics and Mechanical Engineering, University of Science and Technology of China, Hefei 230026, China | 2002 | Journal of Hydrodynamics2002，14，2： | 4 |
| 2 | AN ANALYSIS OF SUBGRID-RESOLVED SCALE INTERACTIONS WITH USE OF RESULTS FROM DIRECT NUMERICAL SIMULATIONS显示文摘Subgrid nonlinear interaction and energy transfer are analyzed usingdirect numerical simulations of isotropic turbulence. Influences of cutoff wave numberat different ranges of scale on the energetics and dynamics have been investigated.It is observed that subgrid-subgrid interaction dominates the turbulent dynamicswhen cut-off wave number locates in the energy-containing range while resolved-subgrid interaction dominates if it is in the dissipation range. By decomposing thesubgrid energy transfer and nonlinear interaction into ’forward’ and ’backward’ groupsaccording to the sign of triadic interaction, we find that individually each grouphas very large contribution, but the net of them is much smaller, implying thattremendous cancellation happens between these two groups. | H. Gong S. Chen G.W. He | 1999 | Acta Mechanica Sinica1999，15，2： | 2 |
| 3 | LARGE-EDDY SIMULATION OF STRATIFIED CHANNEL FLOW显示文摘An investigation of large-eddy simulation(LES) for turbulent chan-nel flow with buoyancy effects was performed by solving the resolved incompress-ible Navier-Stokes equations under the Boussinesq approximation. The Smagorinskyeddy-viscosity model and Yoshizawa eddy-viscosity model were used to describe theunresolved subgrid scale (SGS) fluctuations respectively. After some numerical test-ing, the latter was further simplified so that it can be used in the dynamic modelclosure. A LES code was developed for parallel computations by using the paralleltechnique, and was run on the Dawn-1000 parallel computer. To demonstrate theviability and accuracy of the code, our results are compared with and found in goodagreement with available LES results. | 刘宁宇 陆夕云 汪善武 庄礼贤 | 1997 | Acta Mechanica Sinica1997，13，4： | 2 |
| 4 | 粘性不可压缩对流占优Oseen方程的非协调子格稳定化有限元法分析显示文摘1引言本文考虑粘性不可压缩对流占优Oseen方程,(?)(1)其中:Ω(?)R^d(d=2)为具有Lipschitz连续边界的有界开集,β∈W^(1,∞)(Ω)且▽·β=0,μ、σ为常数,f∈L^2(Ω).当采用通常的混合有限元方法(MFEM)求解时,一般会遇到以下两个困难:·为保证速度和压力数值解稳定,要求有限元空间满足inf-sup(or Babuska-Brezzi)条件.·当对流占优,即0<μ《||β||_(L~∞(Ω))时,数值解会产生伪振荡. | 白艳红 冯民富 王川龙 | 2010 | 高等学校计算数学学报2010，32，2： | 1 |
| 5 | LARGE-EDDY SIMULATIONS OF TURBULENT CAVITY FLOWS WITH DYNAMIC SGS MODEL AND LBM ALGORITHM显示文摘A new method of dynamic SGS model with LBM is described in detail and a new average method of eliminating the inherent unphysical oscillation of LBM are given in this paper. Results using the method to simulate the two and three dimensional cavity flows are shown. | Guan Hui (College of Science, PLA of University of Science and Technology Nanjing 211101,P.R.China) Wu Chuijie (State Key Lab. of Turbulence Study, Peking University Beijing 100871,P.R.China) | 2001 | Transactions of Nanjing University of Aeronautics and Astronautics2001，18，z1： | 0 |
| 6 | LARGE EDDY SIMULATION OF FREE SURFACE TURBULENT CHANNEL FLOW WITH HEAT TRANSFER显示文摘In this paper, the Large Eddy Simulation (LES) was used to study the free surface turbulent channel flow wit h passive heat transfer. The three dimensional filtered incompressible Navier Stokes equations and energy equation were numerically solved with dynamic Subgri d Scale (SGS) models for modeling turbulent stresses and heat flux. To compare the turbulent behavior of the free surface and two walled channel flows, the LES of two walled turbulent channel flow was performed. The statistical quantities and flow structures of the free surface turbulence with heat transfer in the vicinity of the free surface were investigated. The results are also in good agreement with theoretical analysis and available resul ts by Direct Numerical Simulation (DNS). | Zhong, Feng-Quan Liu, Nan-Sheng Lu, Xi-Yun Zhuang, Li-Xian | 2002 | Journal of Hydrodynamics2002，14，1： | 0 |
| 7 | A distributed Grid-Xinanjiang model with integration of subgrid variability of soil storage capacity显示文摘Realistic hydrological response is sensitive to the spatial variability of landscape properties. For a grid-based distributed rainfall-runoff model with a hypothesis of a uniform grid, the high-frequency information within a grid cell will be gradually lost as the resolution of the digital elevation model(DEM) grows coarser. Therefore, the performance of a hydrological model is usually scale-dependent. This study used the GridXinanjiang(GXAJ) model as an example to investigate the effects of subgrid variability on hydrological response at different scales. With the aim of producing a more reasonable hydrological response and spatial description of the landscape properties, a new distributed rainfall-runoff model integrating the subgrid variability(the GXAJSV model) was developed. In this model, the topographic index is used as an auxiliary variable correlated with the soil storage capacity. The incomplete beta distribution is suggested for simulating the probability distribution of the soil storage capacity within the raster grid. The Yaogu Basin in China was selected for model calibration and validation at different spatial scales.Results demonstrated that the proposed model can effectively eliminate the scale dependence of the GXAJ model and produce a more reasonable hydrological response. | Wei-jian Guo Chuan-hai Wang Teng-fei Ma Xian-min Zeng Hai Yang | 2016 | Water Science and Engineering2016，9，2： | 0 |
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