The numerical method of large-eddy simulation, the computational method of compressible turbulent flow, parallel cluster, POD method and the statistical analysis method of turbulence are studied, and the parallel program of large-eddy simulation of turbulent jet are obtained.
对本研究采用的湍流大涡模拟方法、可压缩湍流数值模拟算法、并行机群、POD方法和湍流统计分析方法等进行研究，得到了并行的湍流射流大涡模拟程序。
Through building a mathematical model of gas water heater and using the non- structure grid and the K? εdouble equation model as a turbulence model, we can establish the closed equations composed with the continuity equation, the momentum equation component, K equation andεequation. Using eddy dissipation components combustion model, definition boundary conditions in turbulent flow of chemical composition mix and reaction, separation solver used for initialization and solve combustion model, we can obtain the temperature、pressure distribution of gas water heater, as well as CH4, O2, NO mass fraction of the concentration of distribution in combustion process. Through these distributions, the temperature field and each kind of combustion component characteristic were obtained, including some problems that in the design needs to be pay attention to. Through changing the air speed of flow in the software control panel, the difference of the combustion temperature and each kind of gas mass concentration distribution under the different excess air coefficient was obtained.
通过构建燃气快速热水器的数学模型，采用非结构化网格和K-ε双方程模型作为湍流模型，建立由连续方程、动量方程、K方程和ε方程组成的封闭微分方程组，使用涡耗散组分燃烧模型，定义带化学组分混合与反应的湍流流动边界条件，使用分离求解器初始化并求解燃烧模型，得出了新型燃气热水器内温度场、压力场的分布，以及燃烧过程CH_4、O_2、NO等气体质量分数浓度分布，通过这些分布，得出了温度场和各种燃烧组分的特点及设计中需要注意的一些问题；通过在软件控制面板改变空气流速，得出了不同过剩空气系数下燃烧温度及各种气体质量浓度分布的差异；另外，通过对热水器的引射器进行计算，发现其不能满足引射能力的要求，建议选用完全预混负压吸气引射器，并计算出了其尺寸。
A vertical two dimensional model for thermo stratified flows is proposed, which solves the velocity and pressure by a fractional step method, and Large Eddy Simulation model is used to calculate the Reynolds stress and turbulent diffusion effect.
摘要建立立面二维水动力学与水温耦合模型，用分步法求解流速和压力，采用大涡模型计算紊动应力和紊动扩散。
Based on the theoretical analysis of the kinetics mechanism about the turbulent flow structure, the mixing time would be effected dominantly by the eddy diffusion of mainstream and the controlling index has been pressented in this paper.
从紊流结构分析混凝动力学机理，提出主流区的涡流扩散对混凝时间起主导作用，并导出了混凝综合控制指标，通过试验对比，进一步证实了该指标的实用性。
NO〓 is calculated by Zeldovich disequilibrium theory. Soot is calculated by microcosmic mechanism model which divided the soot formation into soot nuclei, spherule growth and aggregation three stages and the effect on soot of energy which large scale eddy broke into micro scale eddy by turbulent dissipation was considered.
NO〓采用扩展的Zeldovich机理计算，碳烟的计算采用了较为详细的微观机理模型，按照碳烟先兆物的生成、成核和基本碳烟粒子的形成及氧化几个步骤进行建模，并考虑了紊流耗散作用使大尺度涡旋结构破碎形成紊流微尺度涡这部分能量对碳烟核心的影响。
Immediately adjacent to the wall is a laminar sublayer where heat transfer occurs by thermal conduction; outside the laminar sublayer is a transition region called the buffer layer, where both eddy mixing and conduction effects are significant; beyond the buffer layer and extending to the center of the pipe is the turbulent region, where the dominant mechanism of transfer is eddy mixing.
立刻在墙壁附近是层流下层热传递发生由的地方层流下层是转折区域称缓冲层数的热量conduction；outside，漩涡混合的地方并且传导作用是significant；beyond 缓冲层数并且延伸到管子的中心是动荡区域，调动统治机制是漩涡混合。
In this research, a new impliedly numerical method based on SMAC-method is developed for directly solving the steady and unsteady incompressible N-S equation and three-dimensional turbulent flow. Basing on the large eddy simulation method, the streamline against the wind finite element numerical computation model has been developed, which has two-step time and spatial precision and can be used to get the solution of the three dimensional turbulent flow. Supposing the mixture in the cavition region has some distrubutition locally and the compressiable gas and fluid mixture is single-phase fluid, the numerical model of the cavition flows is established.
项目组基于SMAC方法推导了一种直接求解定常、非定场不可压缩N-S方程和三维非定场紊流的隐式数值方法；基于大涡模拟思想，推导了具有二阶时间和空间精度的求解三维非定场紊流的流线迎风有限元数值格式；基于空化区域内的混合物为局部均布、可压缩的气液混合物为单相拟流体的假定，建立了空化流数值模型。
Large eddy simulation in turbulent combustion research Numerical simulation of the turbulent flow in a 3D afterburner
湍流反应流研究中的大涡模拟三维加力燃烧室湍流流场的数值模拟
A review has been undertaken of the development of main turbulent models which include turbulent transport models and large eddy simulations. It has been concluded that the k - ε turbulent model is one of the best for indoor air movement predictions.
本文论述了紊流输运模型和大涡旋模拟等主要紊流模型的发展概况，指出k-ε紊流模型是用于室内气流分布模拟的最好模型之一。
Then, the creation operator and annihilation operator similar to those in the quantum field theory are used to describe the state of turbulent eddy field.
然后，我们采用和量子场论相类似的产生算符和消灭算符来描述湍流涡旋系统所处的状态。
In three-dimensional arbitrary curvilinear coordinate system, an Eulerian-Lagrangian two phase large-eddy simulation (LES) approach was employed to predict instantaneous gas-liquid two-phase turbulent combustion flows in an annular combustor.
在三维任意曲线坐标系下采用欧拉-拉格朗日两相大涡模拟方法对环形燃烧室火焰筒气液两相紊流瞬态反应流进行数值模拟。
Large-Eddy Simulation of a Round Turbulent Jet under the Flow Axisymmetric Assumption
圆湍射流的轴对称大涡模拟
The eddy, by which the utilization rate of assembly unit is promoted, is the critical symbol of the turbulent transportation.
紊流输送的特征是含有漩涡，使用漩涡可以提高装配单元的复用率。
Numerical Simulation and Performance Prediction of Three-Dimensional Turbulent Flow in Francis Turbine; Finite Element Study for 3D Eddy Current and its Application in RFEC Inspection
混流式水轮机全部通流元件的三维湍流流场分析与性能预测三维涡流场有限元研究及其在远场涡流检测中的应用
The particle dispersion mechanism in turbulent separated flow was studied numerically by analyzing the particle dispersion in the separated flow behind a two-dimensional backward facing step. The gas flow was simulated using a large eddy simulation with the solid particle motion traced by the particle track model.
为了揭示颗粒在湍流分离流动中的弥散机制，采用大涡模拟方法和颗粒轨道模型，对二维后台阶分离流动中颗粒弥散进行了数值模拟研究。
Large-eddy Simulation and Analysis of Turbulent Flow in Axial Pump Impeller
轴流式涡轮喷气发动机轴流泵叶轮内部流场大涡模拟及分析
Large-eddy Simulation and Analysis of Turbulent Flow in Axial Pump Impeller A Simulation and Analysis of Different Scroll Profiles'Interior Flow Field
轴流泵叶轮内部流场大涡模拟及分析不同涡旋型线压缩腔流场的模拟分析
Therelationship between the turbulent kinetic energy and its dissipation rate, whichis widely used to parameterize the dissipation rate in turbulence closure models, is found to hold well for both reversing and rotating flows, but with differentcoefficients. Microstructure profiling measurements at two comparative stations (a deepercentral basin and a local shelf break) in the stratified Yellow Sea are analyzed, with emphasis on tidal and internal-wave induced turbulence near the bottomand in the pyenocline. The water column has a distinct three-layer thermohaline structure, consisting of weakly stratified surface and bottom boundary layers anda narrow sharp pycnocline. Turbulence in the surface layer is controlled by thediurnal cycle of buoyancy flux and wind forcing at the sea surface. while thebottom stress induced by barotropic tidal eurrents dominates turbulence in thebottom boundary layer. The maximum level at which the tidally enhanced mixingcan affect generally depends on the magnitude of the tidal current, and it canbe up to 10-15 m in the Yellow Sea. This suggests that, in the deeper regionsof the shelf seas, turbulent dissipation and mixing are very weak at the levelsbetween the near-bottom tidally enhanced layer and the pycnocline. Therefore, these levels provide a significant bottle neck for the vertical exchanges. In theshallow regions, however, the tidally-induced turbulence can occupy the wholewater colum below the pycnocline. A quarter-diurnal periodicities of the turbulentdissipation rate and eddy diffusivity are found at different heights with evidenttime lag. In the relatively flat central basin, the pycnocline is essentially non-turbulent and internal-wave activity is very weak. Therefore, vertical fluxes acrossthe pycnocline decreased to molecular levels. In contrast, internal waves of variousperiods can be always found near the local shelf break.
对强层化季节黄海两对比性站位(分别位于中央海盆区与局地陆坡区)处层化、内波以及湍流混合特征的研究结果表明：1、强层化季节的陆架海水体一般呈现显著的三层热盐结构，在水体近乎混合均匀的上混合层与潮流底边界层之间为强跃层；2、近表层水体的湍流混合强度主要由海表浮力通量的日变化与海表风强迫控制，而在潮流底边界层内，潮混合是水体热量、物质、动量与能量垂直交换的主要机制；3、潮混合影响的深度由潮流大小决定，在黄海，一般可达10-15 m，因此，在水深较深的区域，在跃层与潮混合所至深度范围的上界之间存在湍流混合非常弱的区域，这显著抑制水体内物质的垂直通量，为物质垂直交换的瓶颈，而在水深较浅的区域，潮混合影响范围可至跃层底部，因此物质在跃层以下整个水体中混合非常均匀，当跃层内间歇性强混合发生时，可以产生显著的跨跃层物质输运；4、近底潮致强湍流耗散缓慢地向上传播，底上不同深度处垂直湍扩散系数也具有显著的位相差异，且二者均随时间呈现四分之一周日周期的变化；5、在地形较为平坦的中央海盆区，内波活动非常微弱，因此跃层内湍流混合非常弱，垂直扩散系数为分子扩散水平，跨跃层物质通量受到显著抑制，而在地形变化较为显著的局地陆坡区，内波活动非常活跃，除内潮的影响外，高频内波与内孤立波的影响也很显著，因此跃层内存在很强的间歇性强混合，内孤立波存在的区域，水体湍流混合显著增强。
Large Eddy Simulation of the Turbulent Flow Field in Guide Vane Flow Passages of a Mixed-flow Type Water Turbine
混流式水轮机导叶叶道内湍流场的大涡模拟
The turbulent characteristics in convective boundary layer topped temperature inversion were numerically investigated in terms of large eddy simulation.
采用大涡模拟方法研究了存在逆温层的情况下大气对流边界层的湍流特性。