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耗散率方程
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  dissipation rate equation
     A boundary layer atmospheric model is built with the help of the method of closing the system of the turbulent energy equation and turbulent dissipation rate equation. The conventional meteorological observation data at single station are used to calculate the characteristic parameters inside and outside the atmospheric boundary layer and to calculate the vertical profile of meteorological elements. The computational result reproduces the structural feature of boundry layer.
     借助于湍流能量方程和湍流耗散率方程,用方程组闭合的方法,建立了大气边界层模式.采用单点常规的气象观测资料,计算了大气边界层内外特征参数和气象要素的垂直廓线,再现了边界层的结构特征.计算结果与系留探空观测比较,廓线的变化趋势基本一致.
短句来源
     A k ε model based on the renormalization group theory(RNG k ε model) has the same form as the standard k ε model, but it includes an extra term in the dissipation rate equation through C * 1 that describes the effect of large distortion and incorporates some anisotropic effects.
     RNGk ε模型在耗散率方程中通过系数C 1引入描述流场畸变效应的附加源项后 ,在一定程度上会改善对旋转流、浮力流等较复杂湍流的预报能力。
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  “耗散率方程”译为未确定词的双语例句
     Let therelax factors of the momentum equations are equal to 0.5, the relax factors of the turbulent kinetic energy equation and the turbulent dissipation equation are equal to 0.4. the method of pressure adjust (Method of Primitive Variables) is applied to calculate the pressure.
     对上述离散方程采用ADI法,结合欠松弛迭代求解,对动量方程松弛因子取0.5,紊动动能、紊动耗散率方程松弛因子取0.4;
短句来源
     According to effects of destabilization and stabilization of rotating system, two modifications are proposed to correct ε equation of standard k ε model.
     采用基于旋转体系使湍流脉动加强和削弱两种作用的修正方法对 k-ε双方程的湍流耗散率方程进行修正。
短句来源
     The mathematical model, describing the flow phenomena in the tundish, was established according as the continuity equation, N-S equation, K equation, s equation and energy equation, meanwhile the FLUENT commercial software was used to calculate.
     同时根据连续性方程、动量方程、湍动能方程、湍动能耗散率方程以及能量方程建立描述中间包内流体的数学模型,采用FLUENT商业软件进行数值模拟计算。
短句来源
     There were similarity solutions in the uniform environment for the system of equations including the equation of continuity,the equation of momentum along the flow direction and concentration,and equations of k,epsilon.
     在均匀环境条件下控制该类流动的连续性方程、流动方向的动量方程、浓度扩散方程、湍动能及其耗散率方程存在相似解.
短句来源
     In this thesis,based on dimensional analysis, we use mass-weighed averaged unified second-order moment (MUSM) method and probability density distribution function (PDF) method separately, to construct the explicit algebraic expressions of fluid-particle correlated dissipation rate and fluid-particle correlated turbulence kinetic energy.
     本文分别从视密度加权时平均(MUSM)和概率密度输运方程(PDF)两种途径出发,基于量纲分析,分别构造了两相关联耗散率与拟湍动能或两相关联湍动能的显式代数关系式,并将其同时用于两相关联湍动能和气体耗散率方程的封闭。
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  相似匹配句对
     On Turbulent Dissipation Correlation and Turbulent Dissipation Rate in Turbulence Model
     紊流模式中的耗散相关和能耗
短句来源
     An Analysis of Energy Dissipation Rate for HY-130 Steel Test Piece
     HY~130钢能量耗散特性的研究
短句来源
     Rate of Re-nurture
     反哺
短句来源
     Then at the 6 point will lead to a higher pregnancy rate.
     卵裂.
短句来源
     The Evolution Equation of Joint Pdf of Turbulent Velocity and Dissipation
     湍流速度和耗散联合几密度函数的输运方程
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  dissipation rate equation
A Dissipation Rate Equation for Low-Reynolds-Number and Near-Wall Turbulence
      
These problems could be traced to the modeling of the dissipation rate equation.
      
In this paper an attempt is made to improve the modeling of the dissipation rate equation so that it could successfully predict both free and wall-bounded shear flows including plane wall jets and backstep flows.
      
The particle kinetic energy equation for two-scale fluctuation, particle energy transfer rate equation for large-scale fluctuation, and particle turbulent kinetic energy dissipation rate equation for small-scale fluctuation are derived and closed.
      
The isotropic approach is based on Kolmogorov's hypothesis and a dissipation rate equation modified to account for vortex stretching.
      
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This paper presents a numerical technique for calculating the steady turbulent flow of a incompressible fluid around the stern of body of revolution and its wake by using a streamline iteration method. The turbulence model used is a two-equation (K-ε) model devoloped by Harlow and Nakayama. In this numerical calculation, however, there are some features:1) The convection terms of governing equations for total pressure, turbulent kinetic energy and its dissipation rate in turbulent flow are written in the form...

This paper presents a numerical technique for calculating the steady turbulent flow of a incompressible fluid around the stern of body of revolution and its wake by using a streamline iteration method. The turbulence model used is a two-equation (K-ε) model devoloped by Harlow and Nakayama. In this numerical calculation, however, there are some features:1) The convection terms of governing equations for total pressure, turbulent kinetic energy and its dissipation rate in turbulent flow are written in the form of the variations of tlvese variables along streamlines, and for static pressure the radial pressure gradient equation is used. In this form, these equations can be more eonvienicntly be dealt with in numerical calculation. 2) By means of a system of coordinate transformations, the external flow field extending to infinity in both radial and axial directions is transformed into an internal flow field within a finite region. Therefore, free-stream condition and parabolic flow condition may be used on the outer boundary and downstream boundary repectively. The boundary layer flow and potential flow outside can be resolved by an uniform system. 3) Assumptions for a thin boundary layer and partially parabolic flow, etc. are not needed.A numerical example is gaven to show the fair agreement between the theoretical predition by the present method and experimental results.

本文提出一种利用流线迭代法计算回转体尾部和尾流的定常、不可压缩湍流流动的数值方法。采用Harlow-Nakayama提出的两方程(K-ε)湍流模型。在数值计算上.1)把湍流流动中的总压,湍动能和它的耗散率方程中的对流项写成这些量沿流线变化的形式,静压采用径向压力梯度方程。2)用坐标变换,把径向和轴向都延伸至无穷远的流动区域变换到有限区域内,在外边界可使用自由来流条件,边界层流动和层外的势流流动可用统一的方程组求解。3)没有部分抛物型和薄边界层等种种近似假定。计算实例表明,理论预测和试验结果吻合。

Starting from the fundamental equations for viscous flow, and using gene-ralized tensor form, this paper strictly derives the exact transport eqtations ofthe Reynolds stress, and of the turbulent kinetic energy as well as of the rateof turbulent kinetic energy dissipation for three-dimensional incompressible steadyflows in general rotating and non-orthogonal curvilinear coordinate systems.Acocrding to conventional simpifying assumption, based on the exact transportequations mentioned above, the correct tensor...

Starting from the fundamental equations for viscous flow, and using gene-ralized tensor form, this paper strictly derives the exact transport eqtations ofthe Reynolds stress, and of the turbulent kinetic energy as well as of the rateof turbulent kinetic energy dissipation for three-dimensional incompressible steadyflows in general rotating and non-orthogonal curvilinear coordinate systems.Acocrding to conventional simpifying assumption, based on the exact transportequations mentioned above, the correct tensor expression of k-ε two-equationturbulence model in general curvilinear coordinate systems is derived, and thenthe arguments for the corresponding equations as advanced in [1], [2] and [10]are questioned.

本文从粘性流动基本方程出发,以一般张量形式,严格地推导出了转动、任意非正交曲线坐标系下三元、稳定、不可压缩紊流流动的雷诺应力迁移方程、紊流动能方程和紊流能量耗散率方程。再根据通常的简化假定,导出了K-ε双方程模型在任意非正交曲线坐标系下的张量形式,并对文献[1]、[2]及[10]中相应公式提出质疑。

Based on experimental results, a three-dimension two-phase flow physical model of the mixing chamber in Y-jet is set up. A mathematical model related to the physical model is also established. The numerical computation method is used to investigate and predict the flow fields. In order to consider the effecf of the interface wave between gas and liquid phase, an "Interface function" is proposed, the effect on effective viscosity caused by the existing liquid droplets in the gas phase is also considered in the...

Based on experimental results, a three-dimension two-phase flow physical model of the mixing chamber in Y-jet is set up. A mathematical model related to the physical model is also established. The numerical computation method is used to investigate and predict the flow fields. In order to consider the effecf of the interface wave between gas and liquid phase, an "Interface function" is proposed, the effect on effective viscosity caused by the existing liquid droplets in the gas phase is also considered in the numerical computation. A k-ε turbulcnt model is used in the computation of the gas phase. The numerical computation method is also employed to solve the equations of three-dimensional continuity, momentum, tubulent energy and dissipation. It is show that the computational program can be used to handle the problems of pressure, velocity, turbulent fields and liquid film thinckness of the mixing chamber in Y-jet. A comparison is made between the prediction of the pressure fields and the experimental data. Finally, some thoughts are proposed to improve the mathematical model.

本文提出了Y型介质雾化烧嘴混合段三元两相流动的物理模型,并建立了与之对应的数学模型。文中用数值计算方法对此段流场进行了探讨性求解。为了计算界面波动的影响,引入了界面函数,并且考虑了由于气相中液滴的存在而造成的有效粘度的变化。对核心湍流计算时采用了K—ε湍流模型,对三元的连续性方程、动量方程、湍动能方程、湍流耗散率方程采用数值方法进行了计算,解出了Y型介质雾化烧嘴混合段内压力场、速度场、湍流流场、液膜的变化;并对求解出的压力场与实验结果进行了校核,对进一步完善数学模型提出了一些改进意见。

 
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