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numerical dissipation
相关语句
  数值耗散
     In this algorithm we introduce a free parameter δ, which may control the decay of amplitude and effectively filter the high mode response from the solution. When δ= 1/6, the basic equations of the algorithm have no numerical dissipation.
     本算法引入一个自由参数δ,用以控制振幅的衰减,致使解中的高振型响应,可以有效地被滤掉,当δ=1/6时,可使算法的原始方程没有数值耗散
短句来源
     To solve numerical dissipation and dispersion in numerical solution of convection-diffuson equation, a numerical procedure for simulating the convection-diffusion movement has been developed. The procedure is based on a governing equation which can be divided into Euler type convection equation and Lagrange type diffusion equation.
     为解决对流—扩散型方程数值解中出现的数值耗散和数值弥散,本文通过质点导数概念,将物理方程分解为Euler形式下的对流型方程和Lagrange形式下的扩散型方程,采用特征线法和区域离散数值方法分别求解,二者合成即为对流一扩散运动的整体数值模拟过程。
短句来源
     In order to reduce effectively the numerical dissipation of the rotor wake vorticity induced by Jameson's second-order cell-centered finite volume approach,with the combination of the third-order upwind scheme (MUSCL) and flux-difference splitting scheme,a numerical method based upon the solution of three-dimensional Reynolds-average N-S equations has been developed to simulate the flowfield around a lifting rotor in hovering.
     为减少Jameson二阶中心差分有限体积法导致的旋翼尾迹的数值耗散,将三阶逆风格式(MUSCL)与通量差分裂方法相结合,建立了一个三维雷诺平均N-S方程数值模拟悬停状态旋翼流场的方法。
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
     In order to reduce the false numerical dissipation of the rotor wake vorticity, a new hybrid method based on the Navier-Stokes/Free-Wake/Full-Potential solver has been developed for the efficient prediction of the rotor flowfield.
     为了减少旋翼尾迹的数值耗散,建立了一个基于Navier-Stokes方程/自由尾迹分析/全位势方程的旋翼流场求解的新的混合方法。
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  数值计算能耗
     1. The numerical dissipation of this explicit integration formulaThe relationship between frequency, damping and algorithmic dissipation is studied by using this explicit integration formula in solving dynamic equation of single-degree of freedom.
     以单自由度动力方程求解为例,基于理论分析推导了这种显式积分格式的数值计算能耗特性以及其随频率和物理阻尼的变化规律,并进行数值计算,展示了这种数值计算能耗特性在不同情况下的特征的理论推证结果。
短句来源
  “numerical dissipation”译为未确定词的双语例句
     The 4th order numerical dissipation for pressure was added in the continuity equation to avoid oscillations in pressure solution.
     计算在非交错网格上进行,为了避免压力场的振荡,在连续方程中隐式地加入了压力的四阶数值耗散项.
短句来源
     The numerical experiments demonstrate that the present method has the higher shock resolution and smaller numerical dissipation than the third-order relaxation scheme.
     4.将三阶和五阶WENO重构方法和半离散中心迎风通量相结合,给出了计算一维浅水方程的两种高分辨率、高精度数值方法。
短句来源
     Construction of Low Numerical Dissipation TVD Schemes
     低耗散TVD格式的构造
短句来源
     TWO TIME INTEGRAL ALGORITHMS WITH NUMERICAL DISSIPATION AND WITHOUT OVERSHOOT FOR STRUCTURAL DYNAMIC
     结构动力响应数值算法耗散和超调特性设计
短句来源
     the FVS features exact capture of strong shock and efficiency at a cost of increased numerical dissipation;
     FVS格式捕捉强非线性波的能力很强,计算效率高,但耗散比较大;
短句来源
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  numerical dissipation
An adaptive numerical dissipation control in a class of high order filter methods for compressible MHD equations is systematically discussed.
      
The numerical dissipation term used with the entropy-split equations is in a form which preserves the semi-discrete energy estimate.
      
Thus, the dependence on numerical dissipation to keep the scheme stable for long term time integrations is reduced relative to the original unsplit form, thereby decreasing non-physical damping of solutions.
      
The objective of this paper is to investigate the performance of three commonly used types of discontinuity capturing nonlinear numerical dissipation for both the ideal and non-ideal MHD.
      
The numerical dissipation considered consists of high order linear dissipation for the suppression of high frequency oscillation and the nonlinear dissipative portion of high-resolution shock-capturing methods for discontinuity capturing.
      
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In this paper, a new two-step numerical integration method is proposed which is unconditionally stable. In this algorithm we introduce a free parameter δ, which may control the decay of amplitude and effectively filter the high mode response from the solution. When δ= 1/6, the basic equations of the algorithm have no numerical dissipation. This algorithm possesses a higher accuracy than Wilson-θ and Hilber-α method.

本文给出了结构动力学中的一个新的无条件稳定的两步数值积分法。本算法引入一个自由参数δ,用以控制振幅的衰减,致使解中的高振型响应,可以有效地被滤掉,当δ=1/6时,可使算法的原始方程没有数值耗散。本算法的精度比Wilson-θ法、Hilber-α法有明显提高。本文还讨论了此法在弹塑性地震反应中的应用问题。

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。

To solve numerical dissipation and dispersion in numerical solution of convection-diffuson equation, a numerical procedure for simulating the convection-diffusion movement has been developed.The procedure is based on a governing equation which can be divided into Euler type convection equation and Lagrange type diffusion equation. The numerical experiment shows that the numerical solution can still be remained with a satisfactory precision for the high Peclet number condition in...

To solve numerical dissipation and dispersion in numerical solution of convection-diffuson equation, a numerical procedure for simulating the convection-diffusion movement has been developed.The procedure is based on a governing equation which can be divided into Euler type convection equation and Lagrange type diffusion equation. The numerical experiment shows that the numerical solution can still be remained with a satisfactory precision for the high Peclet number condition in the shock wave region or in the region that has a steep solution gradient.

为解决对流—扩散型方程数值解中出现的数值耗散和数值弥散,本文通过质点导数概念,将物理方程分解为Euler形式下的对流型方程和Lagrange形式下的扩散型方程,采用特征线法和区域离散数值方法分别求解,二者合成即为对流一扩散运动的整体数值模拟过程。数值试验表明:对于大Pe数,在激波区或解梯度较大的区域,本方法的数值解仍能保持较高精度。为数值模拟大气污染、水资源污染过程、粘性流体的流动过程及其他类似问题提供了一个良好的数值模型。

 
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