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数值耗散
相关语句
  numerical dissipation
    Numerical dissipation and dispersion of Hybrid Finite Analytic Method
    混合有限分析格式的数值耗散及频散
短句来源
    The QBC difference scheme is successfully used in the advection part, which saves the calculation period and avoids the numerical dissipation and oscillation.
    成功地将QBC 差分格式应用于大涡模拟对流项中,既即缩短了计算时间,亦可消除数值耗散和振荡。
短句来源
    In the material transportation equation computing temperature, salinity and suspended sediment, the interpolation method is modified to improve the computing precision of the horizontal diffusion term and to decrease the numerical dissipation and instability occurring in the computation so that it can be applied to the case of more intensive bottom slope.
    在温、盐和悬沙计算的物质输运方程中,改进了插值方法,提高了水平扩散项的计算精度,减少了数值计算中产生的数值耗散和数值振荡,并可应用到坡度变化较剧烈情况。
短句来源
    The numerical dissipation and dispersion of Hybrid Finite Analytic Method are investigated by using four-point implicit scheme of HFAM.
    本文以混合有限分析4点隐格式为例,分析了这一格式的数值耗散及数值频散.
短句来源
    It is found that the numerical dissipation is second order and the numerical dispersion is third order.
    得出该格式的数值耗散为二阶,数值频散为三阶.
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  “数值耗散”译为未确定词的双语例句
    The operator-splitting algorithm and the Ultimate Quickest scheme have been used to solve the sediment transport equation.
    悬沙输运方程采用破开算子的方法求解,平流项采用Ultimate Quickest格式求解,即保证了数值格式的守恒性,又消除了数值耗散。 以上措施提高了计算的精度。
短句来源
    The final results show that the first five methods will lead to surface distortion indifferent degree because of the numerical dispersion and dissipation, while the lastone, i.e. the Particle Level Set method can avoid these problems through using ofmassless particles located in the vicinity of the surface because of their Lagrangeproperty.
    最终的计算结果显示,前面五种方法在追踪自由表面的过程中都会由于数值计算误差过大,产生不同程度的界面失真。 而粒子Level Set法由于在自由界面附近采用了具有拉格朗日性质(lagrange property)的无质量粒子,因此对减小一般Level Set法在计算过程中产生的数值耗散和色散误差有显著作用,即使在锐变边界也能十分精确地追踪运动界面的形状。
短句来源
    In order to increase the model stability and decrease the numerical diffusion, the convective terms of the convectiondiffusion equation of suspended sediment were discretized with a thirdorder upwind scheme.
    为了增加模型的稳定性和减少数值耗散,对悬沙对流扩散方程中的水平对流项采用三阶迎风格式离散。
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  numerical dissipation
It has been well studied that the γ-function explicit method can be effective in providing favorable numerical dissipation for linear elastic systems.
      
It is also shown that this integration method provides favorable numerical dissipation not only for linear elastic systems but also for nonlinear systems.
      
Furthermore, the numerical dissipation of the method can be flexibly regulated, so that it is especially suitable for solving various discontinuity problems.
      
For different limiters, the different strength of numerical dissipation and dispersion of schemes is the reason why the schemes show obvious different characteristics.
      
After analysing and comparing the numerical dissipation and dispersion of various schemes, a new kind of limiter is proposed.
      
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The numerical dissipation and dispersion of Hybrid Finite Analytic Method are investigated by using four-point implicit scheme of HFAM.It is found that the numerical dissipation is second order and the numerical dispersion is third order.The effects of the Cell-Reynolds number and Courant number on the numerical dissipation and dispersion are also investigated.The results of the investigation are significant for using the scheme correctly.

本文以混合有限分析4点隐格式为例,分析了这一格式的数值耗散及数值频散.得出该格式的数值耗散为二阶,数值频散为三阶.分析了网格雷诺数R_h,Courant数对该格式数值耗散及数值频散的影响,对于正确使用这一格式有参考意义.

By using a vertical coordinate transformation technique and finite difference scheme, the author developed a mathematical model of suspended sediment movement caused by tidal current. In order to increase the model stability and decrease the numerical diffusion, the convective terms of the convectiondiffusion equation of suspended sediment were discretized with a thirdorder upwind scheme. The model was employed to carry out numerical simulations of suspended sediment movement in the Lingdingyang Bay during...

By using a vertical coordinate transformation technique and finite difference scheme, the author developed a mathematical model of suspended sediment movement caused by tidal current. In order to increase the model stability and decrease the numerical diffusion, the convective terms of the convectiondiffusion equation of suspended sediment were discretized with a thirdorder upwind scheme. The model was employed to carry out numerical simulations of suspended sediment movement in the Lingdingyang Bay during dry and flood seasons. A good agreement was found between the measured data and computed results. Analyses of the computed results showed that the suspended sediment movement mainly existed in the West Shoal, which had little effect on the Lingdingyang channel. The results also showed that the suspended sediment content in flood season is higher than that in dry season, a gradient of suspended sediment content existed in the vertical direction, and the gradient in flood season is larger than that in dry season.

作者使用垂向坐标变换技术,结合有限差分方法建立了三维潮流输沙的数学模型。为了增加模型的稳定性和减少数值耗散,对悬沙对流扩散方程中的水平对流项采用三阶迎风格式离散。应用本模型对伶仃洋的枯季和洪季的潮流输沙的悬沙场进行了数值模拟,将模拟结果与实测资料进行比较,二者吻合较好。模拟结果分析表明:伶仃洋悬沙运动主要集中在西滩,对伶仃航道影响不大;洪季水体含沙浓度高于枯季;水体含沙浓度沿水深存在浓度梯度,且洪季的浓度梯度明显大于枯季。

With the undetermined coefficient method, a new scheme is derived from HAUC2 scheme which applies well under the case of one-dimensional pure convection. New scheme possesses two forms: nonconservative and conservative. Quadrangular pulse and Gaussian distribution case are computed respectively; calculation results show that the new scheme has the merits of small dissipation and dispersion error. Compared with calculation results by many other schemes, the new scheme can simulate all kinds of distribution...

With the undetermined coefficient method, a new scheme is derived from HAUC2 scheme which applies well under the case of one-dimensional pure convection. New scheme possesses two forms: nonconservative and conservative. Quadrangular pulse and Gaussian distribution case are computed respectively; calculation results show that the new scheme has the merits of small dissipation and dispersion error. Compared with calculation results by many other schemes, the new scheme can simulate all kinds of distribution cases correctly and be applied in the engineering practice.

运用待定系数方法,将一维情况下的HAUC2格式推广到二维.该格式具有非保守型和保守型两种形式.分别以二维柱状波和高斯波为例,对二维纯对流方程进行了计算,计算结果表明,新推导的格式具有数值耗散和数值频散都比较小的优点.与其他格式计算结果比较表明,该格式能对各种波形做出比较好的数值模拟,可用于实际计算.

 
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