流体力学

In this paper, a thermal simulation model of a LED driver was established. The thermal field and thermal stress analysis of the driver was done by using the software EFD Pro 8.2, and the temperature rise from various parts and the temperature field distribution of the PCB were obtained. By analyzing the reasons leading to overheating and unideal heat distribution, corresponding thermal simulation using an improved model was carried out. Finally, the comparison and analysis of experimental measurement results and simulation results were given.

本文基于计算流体力学中的有限体积法，建立了该变换器的热仿真模型，利用EFD Pro 8.2软件，对驱动电源内部进行了热场及热应力分析，得到了各部分的温升情况和整个电源温度场的分布情况，分析导致PCB局部过热的原因，然后针对热仿真得出的不理想的热分布情况提出了改进的方法，进行了模型改进，对PCB板上的各部分进行合理的重新布局，并再次进行了热仿真，最终得到了较为理想的结果，最后给出了实验测量结果与仿真结果的对比及分析。

It was proposed in the 1960's and developed rapidly in the 1990's. However, some theory problems, for example, the fluid dynamics and mass transfer during the filling up period which could not be dealt with in conventional distillation theories has been remained unstudied. And the simulation and mathematical models have to be made based on some assumptions, which are different from the actual situation obviously. Therefore the further development of DACO was restrained in the past years.

该操作方法自20世纪60年代提出，90年代以来得到了迅速发展，但众多学者的研究基本上集中在优化操作及其与传统恒回流法的比较，而许多重要的基本理论问题至今缺乏研究，特别是传统精馏理论无法涉及的塔内无回流充液阶段的流体力学和传质问题一直没有得到很好解决，导致了动态累积循环操作法的数学模型和模拟计算只能以与塔内真实状况相差很大的简化假设为基础，这严重地阻碍着动态累积循环操作法的进一步发展。

However, the limitations of the existing algorithms, such as methods in Newton kind, in detecting UPO and estimating system parameters online and the developments and demands of chaos control and synchronization form a sharp contrast.

迄今已提出的很多有效的混沌控制与同步方法，不仅为混沌理论走向应用准备必要的手段，而且在理论上促进了混沌理论和流体力学特别是湍流理论等方面的深入研究。

The one or more cells include a cell body defining an interior vell cavity, a flow path in the cell cavity through which particulate material and fluid flow, an electroactive zone within the cell cavity, and a fluid mechanic device adjacent or within the flow path capable of filling the electroactive zone or maintaining the electroactive zone in a constantly full or maximum electroactivity condition.

该一个或多个电池包括一个能构成内部电池腔的电池本体、一个位于该电池腔中供微粒材料与流体在其中流动的流动通路、一个位于该电池腔中的电活性区和一个流体力学设备，该设备邻近该流体流动通路或在该流体流动通路之内，它能为该电活性区充料或使该电活性区保持在恒定充满或电活性最强的状态。

By means of Laser Doppler Velocimeter and on the basis of the theory of fluid mechanics, the effects of the structural and operating parameters of a double-cone type hydrocyclone on the tangent velocity field are investigated.

利用多普勒激光测速仪，结合流体力学理论，试验分析了双锥体水力旋流器结构和操作参数对切向速度场的影响。

It is very difficult and not veracious to simulate the three dimensional detonationwave propagation by means of fluid mechanics code.

三维爆轰波传播的数值模拟，采用流体力学编码计算是十分困难且很不准确的。

It is very difficult and not veracious to simulate the three dimensional detonation wave propagation by means of fluid mechanics code.

三维爆轰波传播的数值模拟，采用流体力学编码计算是十分困难且很不准确的。

The combination of viscometry with flow cytometry and mathematical analysis as presented here represents a novel approach to differentiating between the effects of hydrodynamics and the intrinsic biological processes that control cell adhesion .

与流式细胞仪和数学分析粘度这里所提出的组合代表了两者之间的流体力学效应和生物过程的内在控制细胞粘附与众不同的新方法。

Many problems in fluid dynamics can be described by theincompressible Navier-Stokes equations as incompressible viscous flow.

流体力学中的许多问题都可归结为不可压粘性流动问题，其数学模型描述为不可压Navier-Stokes方程。

In this paper the viscous flows around a mathematical SWATH in full scale are simulated based on the computational fluid dynamics commercial software FLUENT. The numerical results of total pressure, wall shear stress and the corresponding viscous resistance coefficient at different velocity are obtained. The computational viscous resistance coefficients are compared with the estimated ones using empirical formula. The validity of the software to predict the three dimensional viscous flows and viscous resi...

利用计算流体力学商业软件 FLUENT对一实尺度小水线面双体船数学船型的粘性绕流进行了数值模拟，得到了不同航速下的船体表面总压力、表面剪切应力分布和相应的粘性阻力系数；将各航速下的粘性阻力计算结果和经验公式估算结果作了比较，验证了 FLUENT用于计算小水线面双体船三维粘性流和粘性阻力的有效性。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。