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计算水力学
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  computational hydraulics
     The non-linear partial differential (integral) equation often needs to be solved in the computational hydraulics, however, the mathematical theory of its numerical method has yet not been sufficient at present, for example, the development of some theories such as the strict stability analysis, error estimate and convergence proof has been unable to keep pace with the development of the numerical simulation method.
     计算水力学中所求解的是非线性偏微分(积分)方程组,其数值方法的现有数学理论尚不够充分,严格的稳定性分析、误差估计和收敛性证明等理论工作的发展还跟不上数值模拟方法的进展。
短句来源
     Then, the practical importance of the gas dynamics analogy in computational hydraulics is emphatically expounded. Two flux-vector-splitting (FVS) difference schemes used in CFD are applied to the shallow-water flow computation by this analogy.
     然后着重阐明这一数学模拟对计算水力学具有普遍实用价值,并将计算气体动力学中的两种通量向量分裂(FVS)算法通过比拟应用于浅水流动计算。
短句来源
  computation hydraulics
     The use of the cubic spline formulation in computation hydraulics has been found to be promising and warrants further development.
     在计算水力学中采用三次样条公式,证实是有前途的,值得进一步发展。
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  “计算水力学”译为未确定词的双语例句
     Based on the new developments on environment risk appraisal, early-warning system, compute hydraulics and water quality simulation, and so on, several aspects about the system are discussed in this paper, they are as follows:(1) Analyze the characteristics of sudden water pollution accidents in detail, such as uncertainty of space-time, polluted range and suffer objects, arduousness in dealing with those, long time harm on environment, expanding along the basin and unclearness of urgent response subjects;
     本文深入总结了我国最近几年在环境风险评价、预警系统、应急监测、计算水力学和水质模拟等方面取得的新进展,并在此基础上尝试建立突发性水污染事故预警应急系统体系。
短句来源
     Among the difficult problems in hydraulics is the flow with a free urface,because, not known a priori,it has to be determined as a part of the solution.
     用有限元法计算水力学问题的困难之一是如何处理自由水面.
短句来源
     This treatise introduces the application of mathematical model based upon calculation hydraulics, as a tool to solve the problem of determining the treatment level for an urban wastewater plant nearby the river-mouth or estuary area.
     本文介绍了用计算水力学建立数学模型的方法来解决靠近河口、海湾的城市污水处理厂的处理程度问题。
短句来源
     The general Code DAOB on the basis of author's method can be used to treat two dimcnsional arbitrary boundaries in computational hydraulies.
     用该方法编制的通用程序DAOB,可处理计算水力学中出现的二维任意边界问题。
短句来源
     Although the hydraulic engineering and hydraulics have gained huge development, many problems have not been recognized and need further study and exploration.
     计算水力学。 尽管水工水力学有了空前的发展,但是还有许多问题尚未被人们认识,尚需要继续研究和探索。
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  相似匹配句对
     We also give a new correction factor to simplify the calculation of the Unstatistic.
     的计算
短句来源
     Application of Iterative Method in Hydranlics
     迭代法在水力学计算中的应用
短句来源
     Elementary introduction to calculation of area fluctuating pressures in hydraulics
     浅谈水力学面脉动压力的计算
短句来源
     Mobile Computing
     移动计算
短句来源
     Hydraulic problems ofconstruction engineerings;
     施工水力学问题;
短句来源
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  computational hydraulics
Unsteady shallow water flow over dry beds is at present one of the topics of research in computational hydraulics.
      


Among the difficult problems in hydraulics is the flow with a free urface,because, not known a priori,it has to be determined as a part of the solution.A finite element method based on the variational principle for variable domains is proposed for this type of problems. As shown in Fig.1, the domain of solution is divided by a prescribed F curve into two sub-domains,the fixed ABEPQGMNOA and the variable EFQPE with the free stream line as its boundary. Triangular elements and linear distribution of ψ are adopted...

Among the difficult problems in hydraulics is the flow with a free urface,because, not known a priori,it has to be determined as a part of the solution.A finite element method based on the variational principle for variable domains is proposed for this type of problems. As shown in Fig.1, the domain of solution is divided by a prescribed F curve into two sub-domains,the fixed ABEPQGMNOA and the variable EFQPE with the free stream line as its boundary. Triangular elements and linear distribution of ψ are adopted for the inner region,while trapezoidal elements and linear distribution of q2 for the variable domain. The unknowns to be solved for are the values of ψ of the nodes and the ordinates of points on the free surface. Equating the partial derivatives of the functional to zero furnishes enough equations,thus,the location of the free surface and the values of ψ are solved for simultaneously. The method is applied to free surface sluice gate flow over spillway and computed pressure distribution agrees satisfactorily with experimental results.

用有限元法计算水力学问题的困难之一是如何处理自由水面.因自由水面的位置在计算前是不知道的,求解的区域就不能预先确定.常用的方法是先假定自由水面的位置,把问题当作具有已知边界的问题来计算,然后校核沿自由水面的条件是否满足.如不满足,再重新修改自由水面的位置进行计算,直到能满足为止.本文建议,从可变区域的变分概念出发,把决定自由水面形状的座标和各结点的流函数值当作未知量,形成方程组同时求解.用这种方式可以减少计算的工作量,算出的溢流面压力分布资料和试验结果符合较好.

A two-dimensional laterally integrated numerical model has been developed to represent the velocity and salinity distribution along an estuary.The governing equations which express the conservation of mass,momentum and salt or heat content,are solved by a finite diffrence method in combination with spline functions.The influence of the con-vec tive terms on the resulting distributions of velocity and salinity has been evaluated.The model has been applied to the estuary of the Great Whale River and the Little...

A two-dimensional laterally integrated numerical model has been developed to represent the velocity and salinity distribution along an estuary.The governing equations which express the conservation of mass,momentum and salt or heat content,are solved by a finite diffrence method in combination with spline functions.The influence of the con-vec tive terms on the resulting distributions of velocity and salinity has been evaluated.The model has been applied to the estuary of the Great Whale River and the Little Whale River in the James Bay region.Results of the simulation have been presented together with comparison of some observational data.The sensitivity of the model to various values of the stratification parameters that influence vertical diffusion has been studied and some preliminary results presented.The use of the cubic spline formulation in computation hydraulics has been found to be promising and warrants further development.

本文为描述速度和盐度沿河口的分布规律,而发展了二元横向积分的数值模型。表示质量守恒、动量守恒和含盐量或热容量的主管方程,采用样条函数和有限差分方法相结合进行求解。估计了对流项对速度和盐度分布的影响。 本模型已应用于詹姆斯湾(Jams Bay)区域的大鲸河(the Great Whale River)河口和小鲸河(the Little Whale River)河口的环流计算。本中介绍了模拟结果,并与现有实测数据作了比较。研究了计算模型对影响垂直扩散的不同层化参数值的敏感性,提供了一些初步结果。 在计算水力学中采用三次样条公式,证实是有前途的,值得进一步发展。

This treatise introduces the application of mathematical model based upon calculation hydraulics, as a tool to solve the problem of determining the treatment level for an urban wastewater plant nearby the river-mouth or estuary area.Owing to the interaction of runoff and tide, and the changeable deposition and erosion, the complexity of estuary dynamic points up the difficulty to solve the problem by using common calculating method, as the wastewater is discharged into the water course from the community situated...

This treatise introduces the application of mathematical model based upon calculation hydraulics, as a tool to solve the problem of determining the treatment level for an urban wastewater plant nearby the river-mouth or estuary area.Owing to the interaction of runoff and tide, and the changeable deposition and erosion, the complexity of estuary dynamic points up the difficulty to solve the problem by using common calculating method, as the wastewater is discharged into the water course from the community situated at river - mouth.The application of mathematical model offers a more reliable basis for designing Hangzhou wastewater plant.

本文介绍了用计算水力学建立数学模型的方法来解决靠近河口、海湾的城市污水处理厂的处理程度问题。 河口城市的污水排入水体后,由于受径流和潮汐的相互作用及河道冲淤变化等复杂影响,用一般计算方法已无法解决。我国首次应用数学模型为确定杭州市的污水处理程度,提供了比较可靠的依据。

 
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