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数值粘性
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  numerical viscosity
     Third order upwind difference scheme is applied to convection term to reduce the effect of numerical viscosity.
     采用三阶迎风差分格式离散控制方程中的对流项,克服了原VOF方法中对流项的差分格式精度低于二阶存在数值粘性,在一定程度上掩盖了实际物理粘性影响的缺陷。
短句来源
     Using high resolution MUSCL type interpolation instead of piecewise constant approximation, it reduced the excessive numerical viscosity so that a high resolution scheme is built for the one dimensional non linear conservation laws.
     此类格式利用高阶的MUSCL型插值替代一阶分片常数逼近,减少了LaxFriedrich格式的过多数值粘性,建立了一维标量非线性双曲型守恒律的一类高分辨格式。 讨论以非交错LaxFriedrich格式为模块建立起的差分格式。
短句来源
     To solve the equations, the Godunov scheme with the minimal numerical viscosity and the maximal ability of capturing the singularity of functions is used.
     方程,并且采用数值粘性最小,捕捉函数奇异性的能力最强的Godunov格式来求解。
短句来源
     The negative eject theory is employed to explain the phenomena that the wake over-turn is due to large numerical viscosity.
     文中应用负射流理论解释三维计算中较大的数值粘性带来的尾迹偏移现象。
短句来源
     A fourth-order,semi-discrete central-upwind scheme for multidimensional convection-diffusion equation is presented,where the local speed of wave propagation in the Riemann fans is considered based on a central weighted essentially nonoscillatory(CWENO) reconstruction,and much lower numerical viscosity is encountered and the staggering between two grids is avoided,which is regarded as a semi-discrete central-upwind schem situated between upwind scheme and central scheme.
     提出了求解多维对流-扩散方程的四阶半离散中心迎风格式。 该格式以中心加权基本无振荡(CWENO)重构为基础,同时考虑到在Riemann扇内波传播的局部速度,从而更加准确地估计出了局部Riemann扇的宽度,最终既回避了网格的交错,又降低了格式的数值粘性,建立了介于迎风格式和中心格式之间的半离散中心迎风格式。
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  “数值粘性”译为未确定词的双语例句
     Chapter I summarizes the development in the area of CFD for calculatingflow field in the turbomachinery, analyzing the influence of numerical scheme andthe mesh quality on accuracy and convergence.
     第一章综述了求解涡轮机械流场的 CFD 计算领域的进展,分析了计算格式和网格带来的数值粘性对计算结果的精度和收敛性的影响。
短句来源
     To ensure the numerical dissipation much smaller than the physical viscous terms, directional scaling of the artificial dissipation is achieved and proper boundary conditions are also introduced in this term.
     为保证高雷诺数下N-S方程的数值粘性远小于物理粘性,对人工粘性项进行了方向性修正并引入适当的边界条件。
短句来源
     The numevical experiment shows that the present method has the ability to simulate the convective diffusion equation with high order accuracy, Irttle numerical dissipation, perfect stability and without any parasitic osillation.
     最后的数值实验表明它能很好地模拟对流扩散过程,数值粘性小,精度高,稳定性好,并且没有伪振荡现象发生。
短句来源
     One typical calculating example (Re from 1 to 1000) is presented. The agreement between the numerical results and the exact solution is quite satisfactory and numerical dumping is eliminated.
     本文给出一个算例,分别计算了Re数从1到1000的情形,计算结果与精确解吻合,消除了在一般的数值方法中的数值粘性效应。
短句来源
     In order to reduce the numerical viscosities of TVD schemes and improve their resolution, this paper suggests a new TVD scheme of Harten form with less numerical dissipation. Numerical experiments show that such a TVD scheme is better than Harten TVD scheme [1] and modified Harten scheme (Harten-Yee TVD scheme [2] ) in simulating boundary layer and vortices.
     为了减小TVD格式的数值粘性,提高TVD格式的分辨度,提出了一种 具有较小数值耗散的Harten型TVD格式.数值模拟结果表明,这种Harten型TVD 格式比原来的Harten格式[1]及其改进形式Harten—Yee[2]的TVD格式能更好地模拟 出边界层及涡流。
短句来源
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  相似匹配句对
     Numerical Methods for Viscous Fluid Mechanics
     粘性流体力学的数值解法
短句来源
     Numerical Simulation of Viscous Flow around SWATH
     小水线面双体船粘性数值模拟
短句来源
     The computational result is compared with G.
     数值结果和G.
短句来源
     (2) numerical simulation;
     数值模拟;
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  numerical viscosity
The number of orbits of a particle of gas in the disk is 100-150, testifying to a minimal influence of numerical viscosity in these computations.
      
We derived these temperatures by considering the energy balance in the moving gas, including heating due to the numerical viscosity that is inherent to the simulations and radiative cooling.
      
In our calculations with numerical viscosity v~vΔx (Δx is the unit cell size), this corresponds to time values on the order of ~(L/Δx)(L/v).
      
In the numerical treatment, third-order upwind difference scheme was applied to the convection terms of the RANS equations in order to reduce the effect of numerical viscosity.
      
We prove that adding a suitable vanishing numerical viscosity term leads to a uniform (with respect to the mesh size) exponential decay of the energy of solutions.
      
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A characteristic finite analytic method is proposed to obtain the numeri cal solution of convective diffusion eguation. The scheme formed is unconditionally L∞ stable and in accordance with the convective diffusion phenomenon in physics.In this paper the existence and uniqueness of the scheme is proved and the error estimate of the numerical solution for the linear and non-linear equation is given. The numevical experiment shows that the present method has the ability to simulate the convective diffusion equation...

A characteristic finite analytic method is proposed to obtain the numeri cal solution of convective diffusion eguation. The scheme formed is unconditionally L∞ stable and in accordance with the convective diffusion phenomenon in physics.In this paper the existence and uniqueness of the scheme is proved and the error estimate of the numerical solution for the linear and non-linear equation is given. The numevical experiment shows that the present method has the ability to simulate the convective diffusion equation with high order accuracy, Irttle numerical dissipation, perfect stability and without any parasitic osillation.

本文在详细分析了对流扩散过程物理特性的基础上,按对流扩散过程的物理要求应用特征方法处理对流项、以能充分描述扩散效应的有限分析方法处理扩散项,建立了一种合乎对流扩散物理要求的、无条件L_∞稳定的、数值模拟对流扩散物理现象的特征有限分析方法;并就非线性情况证明了特征有限分析方法的收敛性、给出了解的误差估计。最后的数值实验表明它能很好地模拟对流扩散过程,数值粘性小,精度高,稳定性好,并且没有伪振荡现象发生。

In this paper a new method for solving one-dimensional nonlinear convection-diffusion equation numerically is presented, solving one-dimensional nonlinear Burgers, equation for example. This method is an analytic scheme of fractional steps for convection operator and for diffusion operator respectively. One typical calculating example (Re from 1 to 1000) is presented. The agreement between the numerical results and the exact solution is quite satisfactory and numerical dumping is eliminated.

本文以求解一维非线性Burgers方程为例,详细讨论了一种新的近似求解非线性对流扩散方程的方法。其主要特点是:采用分步方法,对对流算子与扩散算子分别解析求解。本文给出一个算例,分别计算了Re数从1到1000的情形,计算结果与精确解吻合,消除了在一般的数值方法中的数值粘性效应。

In order to reduce the numerical viscosities of TVD schemes and improve their resolution, this paper suggests a new TVD scheme of Harten form with less numerical dissipation. Numerical experiments show that such a TVD scheme is better than Harten TVD scheme [1] and modified Harten scheme (Harten-Yee TVD scheme [2] ) in simulating boundary layer and vortices.

为了减小TVD格式的数值粘性,提高TVD格式的分辨度,提出了一种 具有较小数值耗散的Harten型TVD格式.数值模拟结果表明,这种Harten型TVD 格式比原来的Harten格式[1]及其改进形式Harten—Yee[2]的TVD格式能更好地模拟 出边界层及涡流。

 
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