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smooth region
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  光滑区
    The f-Re relationship and formula for mean velocity in smooth region of turbulent open channel flow with hyperconcentrated sediment
    高含沙明渠紊流光滑区f-Re关系与平均流速公式
短句来源
    Study on the Convergence Interval of Iteration Algorithm About Industrial Pipes Resistance Factor in Smooth Region of Turbulent Flow
    工业管道紊流光滑区阻力系数迭代算法的收敛区间研究
短句来源
    On the basis of hypothesis the velocity distribution formula of the steady uniform turbulent flow in the hydrauic smooth region of the pipe and the open channel is deduced , which involves the velocity defect law and the wall law , and it is characterised by higher accuracy and simper computation .
    並且据此得到了圆管与明槽中恒定均匀紊流水为光滑区的流速分布公式. 它概括了流速亏值定律与壁面定律,精度较高,毋须分区,计算较简单;
短句来源
    The plotting of the f-V curve helps to establish the calculating formula for mean velocity V which can be used in turbulent smooth region.
    通过分析f与断面平均流速V的关系,建立了高含沙明渠紊流光滑区平均流速公式,井作初步分析.
短句来源
    This paper has studied the convergence of iteration algorithm about common industrial pipes resistance factor in smooth region of turbulent flow and given the convergence interval. The result of this study perfects the Nigolaz formula and fills blanks in texts.
    本文研究了一般工业管道紊流光滑区阻力系数迭代算法的收敛性,给出了收敛区间.此项研究结果使尼古拉兹公式更加完善,同时也添补了教科书上的空白.
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  “smooth region”译为未确定词的双语例句
    Based on theoretical analysis, a unified formula for the velocity distribution is suggested to fulfill all the wall conditions, which include the hydraulic smooth region, transitional region and rough region. With Thatchell's algebraic stress model and the formula suggested in this paper, the 3-D flow in the compound channel with lateral change in bed roughness is simulated.
    根据理论分析建立了适合于描述水力光滑、水力过渡和水力粗糙这三种壁面条件下时均流速沿垂线分布的统一公式,并利用该流速分布公式,采用Thatchell代数应力模型,对复式明渠粗糙度沿横向存在变化的流动进行了三维模拟.
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  smooth region
The proposed method assigns the desired grid stretching over the smooth region during initial grid system generation and before grid adaptation is performed.
      
Its solution exhibits some novel features: an emergence of two explicit scales delineating the asymptotic regimes (Planck scale region and a smooth region of a quantum point oscillator).
      
This paper considers a fully practical piecewise linear finite element approximation of the Dirichlet problem for a second order self-adjoint elliptic equation,Au=f, in a smooth regionΩ?>amp;lt;?n (n=2 or 3) by the boundary penalty method.
      
For the smooth region we use the run length scanning and linear approximating.
      
On the basis of edge detecting, an image could be divided into the sensitized region and the smooth region.
      
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The turbulent structure in open channels and pipes is one of the basic problems in hydraulics, In this article special attention has been paid to analyze the flow structure close to the bed on the basis of stochastic theory of turbulent flow developed by the author. It is pointed out that the division of the flow regime into smooth, transition and rough depends on the fact whether the flow passing the roughness element is separated or not. When the Reynolds number is low (ν_*△/ν≤1.25), there is no separation...

The turbulent structure in open channels and pipes is one of the basic problems in hydraulics, In this article special attention has been paid to analyze the flow structure close to the bed on the basis of stochastic theory of turbulent flow developed by the author. It is pointed out that the division of the flow regime into smooth, transition and rough depends on the fact whether the flow passing the roughness element is separated or not. When the Reynolds number is low (ν_*△/ν≤1.25), there is no separation and turbulent flow is in the smooth region. As there is a partial separation. the turbulent flow would be in the trasition region. When the Reynolds number is high (ν_*△/ν≥100), there would be a complete separation and the turbulent flow would be in the rough region. The thickness α△ of separation layer and the velocity v_α at the top of the separation layer are given. By using these boundary conditions a universal velocity distribution law for all three regions is deduced. By integrating the velocity distribution formula over the cross-sectlonal area of circular pipe we can obtain the universal equation to determine the drag coefficient in all smooth, transition and rough regions. In the case of open channel flow an analogical universal drag coefficient formula can be obtained too. In such a way the well-known drag coefficient diagram of Nikuradse has been generalized in theory. All the theoretical formulas obtained are in good agreement with the experimental results reported by various investigators,

明渠和管道中的紊流结构,是水力学中的一个基本问题。本文试图在作者提出的河床紊流随机理论的基础上,通过对壁面糙率绕流情况的分析,导出包括光滑区、过渡区和阻力平方区在内的流速分布的统一公式和阻力系数的统一公式,为这些多年来没有解决的问题提供理论上的分析和概括。导得的流速分布的统一公式和阻力系数的统一公式,均与试验资料一致。

?, a new hypothesis about ε in the fluctuating tangential stress formula——?, is presented by analysing the steady uniform turbulent flow in the pipe and the open channel .On the basis of hypothesis the velocity distribution formula of the steady uniform turbulent flow in the hydrauic smooth region of the pipe and the open channel is deduced , which involves the velocity defect law and the wall law , and it is characterised by higher accuracy and simper computation . In comparison with the fluctuating tangential...

?, a new hypothesis about ε in the fluctuating tangential stress formula——?, is presented by analysing the steady uniform turbulent flow in the pipe and the open channel .On the basis of hypothesis the velocity distribution formula of the steady uniform turbulent flow in the hydrauic smooth region of the pipe and the open channel is deduced , which involves the velocity defect law and the wall law , and it is characterised by higher accuracy and simper computation . In comparison with the fluctuating tangential stress formula of plandtl and karman the fluctuating tengential stress formula obtained from the above hypothesis is more applicable to the real situation . As a result , a formula of the frictional coefficient λ in the pipe is derived . Ins calculation value is more consistent with the λ value computed with 20 formulas from 1913 to 195o . It has been found that λ for axisgmmetric flow and λfor two dimentional flow are not completely comform · ? the formula of the velocity distribution in the nonhydraulic smooth region of the pipe and the open channel , can also be developed from the new hypothesis (coefficient m and K must be determined by experiments) .

通过圆管与明槽中恒定均匀紊流的分析,对紊流脉动切应力?中的ε提出了一个新假设:?.並且据此得到了圆管与明槽中恒定均匀紊流水为光滑区的流速分布公式.它概括了流速亏值定律与壁面定律,精度较高,毋须分区,计算较简单;由此得到的脉动切应力分布比起Prandtl和kármán的脉动切应力假设更符合实际;根据这个假设还得到圆管中阻力系数λ的计算公式,公式计算值与1913-1953这40年间共20个紊流水力光滑区的λ经验公武的计算值比较吻合.通过分析,作者认为轴对称问题和平面问题的沿程阻力系数并不完全一致.

In the paper the results of systematic measurements on the turbulent structure of channel flows, including those in smooth, transition and rough regions, are presented and analyzed in details. For turbulent intensities, the formulas (1-2) and (3-2) given by Dou Guoren on the basis of stochastic theory of turbulent shear flow are compared with the experimental data and the result of eomparison shows that both formulas can be applied not only to the smooth region, but also to the transition and rough regions....

In the paper the results of systematic measurements on the turbulent structure of channel flows, including those in smooth, transition and rough regions, are presented and analyzed in details. For turbulent intensities, the formulas (1-2) and (3-2) given by Dou Guoren on the basis of stochastic theory of turbulent shear flow are compared with the experimental data and the result of eomparison shows that both formulas can be applied not only to the smooth region, but also to the transition and rough regions.

本文采用激光流速仪对光滑、过渡和粗糙明渠紊流结构进行了系统的试验研究。根据试验成果,分析了上述紊流特点,指出了明渠时均结构和脉动结构与壁面粗糙的关系,对粗糙管道、明渠和天然河流中的水流脉动结构进行了分析比较。最后,文中对随机理论的明渠紊流时均结构和脉动结构表达式进行了初步验证。

 
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