In this paper, the application of PIV in complex flow field test is introduced, such as Poisoeullie flow and flow around a circular cylinder, vortices of cross flow past a horizontal square cylinde, the characteristics of vortex wave flow, vortexes of cross flow past a horizontal circular cylinde, attached saddle point of 3-D separation in juncture flow, swirling flow tundish, unsteady horseshoe vortex structure in juncture flow.
本文阐述了PIV粒子图像测速的基本原理及其在复杂流场测试中的应用状况，如泊肃叶流动及圆柱绕流、横流中水平方柱绕流旋涡、涡旋波流场、横流中近壁水平圆柱绕流旋涡、角区三维分离的附着奇点结构、漩流中间包流场、角区非定常马蹄涡结构。
Through the analyses of the time-average flow field and the animated isentropic cartoon, we recognize the characteristics of the flow field, the existence range of the vortex shedding. The interaction of the leading edge and trail edge vortex and corner vortex was investigated, and the rule of their development and their effect to each other were also discussed along with the frequency spectrum analysis.
通过对于流场时均图和等熵动画图的分析，捕捉到了流场的流动特性和流场中旋涡的存在范围，探索了叶片前缘和尾缘的脱落旋涡以及角涡之间的相互作用，相互影响以及这几种旋涡随时间空间变化的运动规律。
The instantaneous process of vortex was analyzed and the movement of circumfluence vortex was obtained in instantaneous flow field.
在瞬时流场中，分析涡的瞬态过程，得到了回流涡的运动情况；根据温室室外涡量分布图，计算出温室的阻力系数为0.565；从互插式连栋温室室内涡旋运动图中可以看出，沿气流方向涡旋在拱1中的变化慢，在拱2、拱3中的变化快。
The flow field around the wing with deployed high lift devices is three-dimensional, viscous and with the complex vortex motion. It is difficult to model the sound field of wing noise sources by the numerical calculation of aerodynamic equations with the current computer condition and numerical scheme.
本文的结果表明襟翼侧缘宽频噪声主要是由于湍流脉动在襟翼侧缘处形成的非定常通量产生的；一个意想不到的结果是，在襟翼侧缘噪声谱中发现了两种不同性质的单音噪声，一种是典型的后缘噪声源，而另一种单音噪声源具有与上述单音相反的指向性。
First, the typhoon flow field is decomposed into two parts: the maximum asymmetric vortex and irrotational environmental flow field. Then the maximum asymmetric vortex is also decomposed into two parts: the maximum symmetric vortex and β-gyres. Finally, typhoon Pearl(2006) is simulated by WRF model(weather research and forcasting model), and flow fields at various times at 500hPa...
首先，将台风的流场分解成最大的、不对称的涡旋流场和无旋流场；然后将不对称的涡旋流场分解成最大的对称涡旋和不对称的β涡旋对；最后，利用WRF(weather research and forcasting)模式(V2.1.2)模拟了200601号珍珠台风，并对各时次的500hPa风场用该方法进行分解，结果表明：该方法对台风的运动机理研究和实际的台风路径预测提供了有价值的信息。
First, UWPBL model(The University of Washington Planetary Boundary Layer Model) is used to retrieve typhoon`s sea level pressure from sea surface winds data of SeaWinds which aboard on QuikSCAT and these strength results are analyzed. Then the variational method is applied to decompose the sea surface winds field into two parts: the vortex and irrotational environmental flow field, the UWPBL model is used again to retrieve ShanShan and YaGi typhoons` sea level pressure from the vortex flow field, the results of typhoon`s central positions are analyzed by comparing the results with the results of direct retrieving, NCEP`s data and typhoon annual reports. It turns out that the accuracy of the typhoon`s sea level pressure central position has been obviously improved, This method offers a new idea for the study of typhoon from microwave scatterometer data.
本文首先利用QuikSCAT散射计获取的海面风场资料，利用华盛顿大学行星边界层模式对台风海平面气压场进行反演，并对其强度进行了分析；然后对获取的海面风场，采用变分方法对风场进行分解，分解出无旋和有旋风场，对分解出的有旋风场，再利用UWPBL模式对珊珊和魔羯台风的海平面气压场进行了反演，对所得结果与通常直接反演、NCEP海平面气压场及台风报文资料进行一一对比，结果表明：新的反演定位的方法对台风海平面气压场中心气压的定位精度有了大幅度的提高，此种定位的方法为散射计资料在台风中的实际应用开辟了一条新的思路。
The results shows: The scale of top blade clearance is closely relative to the strength of leakage flow and distribution of tail trace position in passage, the leakage flow and passage vortex interaction has seriously affected the flow field distribution of inner passage.
结果表明：叶顶间隙的大小与泄漏流动的强度和通道内的尾迹区位置分布密切相关，泄漏流动与通道涡的相互作用严重影响了通道内的流场分布。
In chapter 6, with research in vortex structures of round jet, discern the shear layer vortex structure and its instability lead to periodic roll-up of Kelvin-like vortex, give the description of its evolvement process: the pairing, incorporation, and generation stream wise vortex of Kelvin-like vortex. Discuss the generation mechanics of vortex of cross-flow detour, and it turned toward stream wise direction. Get the relation between vortex of cross-flow detour and counter-rotating vortex pair which becomes the dominant flow feature in far field. Make clear the position of CVP related to jet body.
第六章 对于横流中圆孔射流旋涡结构的研究，我们发现了射流迎、背流附面涡层卷起的类开尔文涡列，并详细讨论了它的演化发展过程：各展向旋涡的配对、合并以及失稳后流向次反向旋转涡对的形成；讨论了横流绕流分离旋涡的生成机理及其转向，以及其与射流远区主要流动特征主反向旋转涡对的关系；澄清了射流主体与主反向旋转涡对之间的相互关系。
As we suppose the flow in the runner is steady flow and imcompressable and 3D vortex flow, applying 3D Euler method and laminar method and turbulent model representing the standard κ-ε model computed the flow field of a Fancis runner for many operating conditions Comparing the simulating results of three kinds of turbulent calculation models roundly we obtained many valuable results.
本文在假设转轮内部流动是定常、不可压缩、全三维有旋流动的基本前提下，分别应用3D欧拉法、层流解法和以标准κ-ε模型为代表的湍流双方程模型，对某一混流式转轮内部流动进行了多工况点、大范围的数值计算，对这三种计算模型的计算结果进行了全面比较，得出了有价值的成果。
At last, the paper aims at the shortcomings of current VR development tools and VARE and addresses the emergency of the incorporation of modeling and simulation tools from physical based simulation into virtual reality to build authentic virtual environment, then introduces the attempt in this field using WorldToolKit and Vortex.
本文以碰撞检测和动力学仿真为主要研究内容进行探讨，并利用WorldToolKit与动力学仿真引擎Vortex在这一研究领域做出了有益的尝试。
The simulation result has demonstrated the periodic characteristics of microjet flow field including vortex pair's evolution, immigration and dissipation process.
计算结果较准确地模拟出微射流流场中，旋涡对的周期性产生、迁移和耗散细节；分析了微射流对环境流体的卷吸特征以及不同来流驱动频率下微射流的能量水平等。
Evidence suggests that 1 under more stable stratification, the basic flow, if moving faster at low and high levels (particularly in the presence of jets there), allows a resulting meso-β unsteady wave to propagate eastward with respect to basic flow and even at greater velocity compared with it; 2 vertical windspeed shear of basic flow causes instabilities of the TWT perturbation; 3 considering the second derivative of basic-flow wind with respect to z (denoted by zz≠ 0 which is simply given as β* hereafter) the expression for the phase velocity of vortex Rossby wave is obtained, which is unidirectional in propagation with respect to basic flow; 4 VRoW has its physical origin from β*, i. e., from z-varying heterogeneities of y-direction averaged vorticity of the basic flow field; 5 VRoW phase velocity is associated with zonal wave number k, its energy is dispersive and the group velocity exists in the x direction; 6 when windspeed meets the condition of β*, TWT disturbance instability may be that of mixed VRoW and gravity wave; 7 if basic flow is subject to linear shear but does not meet the condition of β*, the TWT instability is that of inertia-gravity wave.
在大气层结比较稳定的情况下，如果基本气流在低层和高层较大(有可能存在低空急流和高空急流)，此时产生的β中尺度不稳定扰动相对于基流向东传播，甚至于快速向东传播。基本气流在垂直方向上的风速切变对于中尺度横波型的扰动起着不稳定的作用。如果考虑基流的二次切变，可以得到涡旋Rossby波的相速度表达式，涡旋Rossby波相对于基本气流是单向传播的。涡旋Rossby波产生的物理根源是基本流场的风速二次切变，亦即基本流场y方向的平均涡度在空间z方向上的不均匀所致。涡旋Rossby波的相速度与纬向波数也有关，它的能量是频散的，其在纬向x方向也存在群速度。在基本流场的风速存在二次切变时，横波型不稳定可能是混合的涡旋Rossby重力波的不稳定；而在基本流场的风速仅仅存在线性切变，不存在二次切变时，横波型扰动的不稳定则是重力惯性波的不稳定。
By the principle of penalt function, the irrotational fluid field is constrained, and author has proposed the Difference Method for distinguishing fluid vortex modes among the natural modes of coupled systems. Author has calculated the real frequencies with the extra deductive method, and discussed the influence of the numerical solution due to the irrotational constraint.
对于流体有限扰动时的非线性耦合系统的有限元分析作了一些探讨，给出了非线性系统的基本方程、变分原理及有限元方程，并具体地导出了三维几何非线性流体单元的切线刚度公式，采用增量形式的Newmark预报——校正逐步积分法计算系统的动力响应，由Newton-Raphson迭代法及其修正方法求解系统的非线性方程组，还列出了不平衡力余量检查和位移迭代增量检查等迭代收敛判断准则。
The structure, flow field distribution and the dust separating procedures of inner speeding vortex cyclone collector are very different from that of traditional cyclone dust collectors.
混流区和中心旋流区是内旋流加速旋风集尘器的主要特征之一。
The existing plenum chamber had the full impact on distribution of interior field function in vortex tube.
因为充气腔结构的存在影响着涡流管喷嘴内部场分布。
A single Co nanoplatelet forms a vortex magnetization configuration at zero external field.
单个钴纳米片在零场下形成一种磁涡旋结构的平衡磁化形式。
Based on an engineering background, through numerical simulation of the flow field in the HP Turbine of the Energy Efficient Engine(E3), the article research the unsteady flow in a transonic turbine stage, the unsteady phenomena in the stage include the Shockwave, wake, shedding vortex, endwall vortex, passage vortex and leakage vortex, etc.
本文首先对于研究的意义和国内外研究的现状做了简要的介绍，再从某工程背景出发，通过对E3发动机高压涡轮内流场的数值模拟，研究了干涉的周期性的问题，以及涡轮级内常见的非定常现象：激波、尾迹、脱落涡、根脚涡、通道涡、漏流涡。
Therefore, the problems brought by helical vortex in flow field arouse interest widely, and the investigations of helical vortex possess important theoretic significance and utility value.
因此，装置中的螺旋涡问题越来越引起人们的关注，对这个问题的研究有着重要的理论意义和实用价值。
The computed results showed that the internal flow field is very complicated with flow separation and vortex in some regions, and the velocity distribution uniformity are quite poor.
模拟结果表明，蜗壳式出水流道的内部流态非常复杂，在一些区域有局部涡流和脱流现象，流速分布均匀性较差。
The FLUENT code is used to simulate the gas flow-field in flow-guided structure of plane vortex classifier to optimize its geometrical and operational parameters, which focuses on the effect of spiral case and guide vanes on the stable flow-field establishment.
采用FLUENT流体力学软件对平面涡流分级机导流部分几何参数与操作参数进行数值模拟，重点研究蜗壳与导风叶对导流效果的影响。