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数值耗散
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  “数值耗散”译为未确定词的双语例句
    The numerical scheme of the advection term should be designed correctly for the fronts of sharp concentration gradients to prevent excessive numerical diffusion or dispersion when calculating mass transport in the areas of estuary and coast.
    用数值模式对河口海岸地区的物质输运进行计算时,平流项的数值格式必须要能正确处理物质浓度锋面,以避免产生过多的数值耗散或频散。
短句来源
    Without repeated interpolations such as in ELM, the Particle-tracing Method reduces the numerical diffusion quite a lot.
    因为没有像欧拉-拉格朗日方法那样反复插值,所以质点跟踪法极大地降低了数值耗散
短句来源
    It is shown that cubic spline method is effective for restraining numerical dispersion in numerical simulation of hydrodynamic dispersion equations with radioactive decay.
    结果表明,三次样条方法在带有放射性衰变的水动力弥散方程的数值计算中,对抑制数值耗散是一种有效的方法。
短句来源
    Numerical calculation results show that the developed scheme has many advantages such as having small dissipation and dispersion, needing little nodes, being put into practice easily, and being well suitable for both convection-dominant flow and diffusion-dominant flow.
    数值试验结果表明,该格式具有数值耗散和数值频散较小、节点少、便于应用等特点,且对求解对流扩散方程的对流占优和扩散占优的流动均有较好的适应性.
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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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Cubic spline method was used to solve numerical model for radio-nuclide transport from injection well into a single fracture in a porous formation, and the results were compared with those of finite difference scheme. It is shown that cubic spline method is effective for restraining numerical dispersion in numerical simulation of hydrodynamic dispersion equations with radioactive decay.

本文采用三次样条方法计算了放射性核素从注入井中向多孔岩层裂缝中传输的数值解,并与有限差分解、解析解作了比较。结果表明,三次样条方法在带有放射性衰变的水动力弥散方程的数值计算中,对抑制数值耗散是一种有效的方法。

This paper presents a three-dimensional mathematical model for predicting plumes from waste water outltes. The cumulative discharge method is employed to obtain the plume formulas which are easy to use, without numerical diffusion, and valid for irregular topography. The model can predict the behavior of waste water plumes in more detail, practical applications of the model illustrate its validity and efficiency.

本文介绍了用于模拟工程废水排口附近污水带的三维水质数学模型。该模型通过累积流量坐标交换,获得在较复杂地形条件下模型的解析解,模型简便,没有数值耗散误差,能较详尽地表述污染带时、空连续分布过程,应用结果表明,效果良好,是一种可以解决水质预测问题的有效方法。

By using the undetermined coefficient method, a new scheme is derived from the HAUC2 scheme to simulate the two dimensional convection-diffusion equation. Numerical calculation results show that the developed scheme has many advantages such as having small dissipation and dispersion, needing little nodes, being put into practice easily, and being well suitable for both convection-dominant flow and diffusion-dominant flow.

运用待定系数法,建立了求解二维对流扩散方程的HAUC2格式.数值试验结果表明,该格式具有数值耗散和数值频散较小、节点少、便于应用等特点,且对求解对流扩散方程的对流占优和扩散占优的流动均有较好的适应性.

 
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