紊流

Firstly, adopting the 3—D standard k-ε two equation model, the turbulent flow field in pumping station forebay is numerically solved by finite volume method and the technology of hybrid grid.

本文先采用三维标准k-ε紊流模型，运用控制容积法及混合网格生成技术，对泵站前池的水流运动作了模拟，得出泥沙运动计算所需的物理量。

Central South University, Changsha 410075, China）Abstract: Based on 2D steady and incompressible Navier-Stokes equation and k-ε turbulent model,the lateral aerodynamic performances of four types of car, i.e. passenger car, gondola car, boxcar and tank car were analyzed and compared by finite volume method, when these cars were in the cross winds of the same velocity and on the railway with the embankment of the same height.

摘 要：根据二维定常不可压缩Navier-Stokes方程和k-ε双方程紊流模型，采用有限体积法对客车、敞车、棚车和罐车4种不同外形铁路车辆在路堤高度、横风风速相同条件下的横向气动性能进行分析与比较。

He is actively involved in the fundamental research in turbulent flow and heat transfer and its applications in the HVAC industry.

研究内容包括紊流和热传递的基础理论以及其在采暖通风空调行业中的应用。

This paper corrects the experimental formala of pressure loss within laminar flow through experiment and analysis.

问题的提出液体流动基本上分为层流和紊流两种不同的流动状态。

The new computational model s for describing streaming electrification of oil with laminar and turbulent flow states are presented.

给出了层流和紊流条件下新的管道油流带电计算模型。

The new computational models for describing streaming electrification of oil with laminar and turbulent flow states are presented.

给出了层流和紊流条件下新的管道油流带电计算模型。

The calculation expression of length at entry of velocity boundary layer about laminar and turbulent flow is obtained.

得到了管道层流和紊流时速度边界层入口段长度的表达式，表明比现有教材中所给出的公式数值要小。

But the shell side flow was dominated by the laminar flow with increasing of the packing density.

在装填密度较小的时候，紊流倾向十分明显；当装填密度较大的时候，壳程的流动状况与层流相对比较接近。

Rough pipe ; turbulent boundary layer ; logarithmic velocity distribution.

粗糙管；紊流边界层；流速分布对数律

In this paper, formulas for calculating the thickness of the turbulent boundary layer and the inlet length in the entrance region of the rough pipe are given with the help of momentum integral equation in which the velocity distribution is the logarithmic law.

本文在流速分布对数律假设下，通过求解动量积分方程获得了粗糙圆管进口段紊流边界层和进口段长度的计算式。

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。