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mixed mesh
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  混合网格
    The semi-staggered, non-equidistante non-orthogonal mixed mesh system is used by base of the characteristics of the method and the circular pipe with rapid-changed cross-section.
    根据本方法和剧变截面圆管的特点,采用半交错不等距非正交贴体混合网格系。
短句来源
    Third component velocity was obtained by means of continuity equation. According to the characteristics of semi-false transient equations and flow region,the semi-staggered non-equidistant non-orthogonal curvilinear mixed mesh system was adopted in the numerical computation of the method.
    根据半人工瞬变方程组的特点和流动区域的特性,本方法采用半交错不等距非正交曲线贴体混合网格系进行数值计算,并利用质点导数差分格式使计算更简便。
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  mixed mesh
Engineering procedures employ the results of numerical solution of axially symmetric boundary value problems of thermoelasticity based on the mixed mesh-projection scheme of the finite element method implemented in the RELAX software.
      
CT showed a mixed mesh-like soft tissue density and air in the centre of the lesion and a thick soft tissue band at the periphery of the right maxillary and ethmoid sinuses and nasal cavity.
      


The fundamental equations of the incompressible flow in porous media were written for the flow in porous media in the circular pipe with rapid-changed cross-section. The numerical computational method to solve original variables (velocity and pressure) was improved in the paper. Finality the motion equation on non-main-flow direction was used to compute the pressure. Then the motion equation on main-flow direction was used to compute the velocity component on main-flow direction. Finally the continuity...

The fundamental equations of the incompressible flow in porous media were written for the flow in porous media in the circular pipe with rapid-changed cross-section. The numerical computational method to solve original variables (velocity and pressure) was improved in the paper. Finality the motion equation on non-main-flow direction was used to compute the pressure. Then the motion equation on main-flow direction was used to compute the velocity component on main-flow direction. Finally the continuity equation was used to compute the velocity component on non-main-flow direction. The difficulty and trouble, which were introduced in general method to compute pressure from the continuity equation can be avoided. The semi-staggered, non-equidistante non-orthogonal mixed mesh system is used by base of the characteristics of the method and the circular pipe with rapid-changed cross-section. The difference equation and computational formula for iteration computation were written in detail. The examples of the flow in porous media in the circular pipe with rapid-changed cross-section were numerically computed. The advantages of the method are its simplicity and practicability. So the method has extensive application values in the engineering.

对于剧变截面圆管的渗流问题写出不可压缩渗流的基本方程组,对直接求解原始变量(速度和压力)的数值计算方法作出改进。先由非主流方向的运动方程计算压力,后由主流方向的运动方程计算主流方向的速度分量,再由连续性方程计算非主流方向的速度分量。这样可以避免在一般的求解原始变量方法中由连续性方程计算压力时出现的困难和麻烦。根据本方法和剧变截面圆管的特点,采用半交错不等距非正交贴体混合网格系。本文详细写出差分方程和迭代计算公式,对剧变截面圆管内的渗流算例进行数值计算。本方法的优点是简单和实用,在工程上具有较大的应用价值。

A method of semi-false transient to compute three dimensional steady flow was presented.The feature of the method was that,the original basic equations in fluid mechanics were directly used to numerically compute.One component equation in motion equations was used to compute the pressure.Other two component equations added by false transient terms were become false transient equations.These two false transient equations were used to compute two component velocities.Third component velocity was obtained by means...

A method of semi-false transient to compute three dimensional steady flow was presented.The feature of the method was that,the original basic equations in fluid mechanics were directly used to numerically compute.One component equation in motion equations was used to compute the pressure.Other two component equations added by false transient terms were become false transient equations.These two false transient equations were used to compute two component velocities.Third component velocity was obtained by means of continuity equation.According to the characteristics of semi-false transient equations and flow region,the semi-staggered non-equidistant non-orthogonal curvilinear mixed mesh system was adopted in the numerical computation of the method.Difference scheme of particle derivative was used in order to simpler compute.The problem of three dimensional steady incompressible flow around cylinder in the circular pipe was taken for an example of computation.The semi-staggered nonequidistant non-orthogonal curvilinear mixed mesh system was designed,the computational method and procedure about the method of three dimensional semi-false transient were described,and the computational results of the example were obtained by the numerical computation.

本文提出一种计算三维定常流动的半人工瞬变法,本方法的特点是直接利用流体力学的原始基本方程组进行数值计算。运动方程中的一个分量方程被用于计算压力,另外两个分量方程被加入人工瞬变项而成为人工瞬变方程,这两个人工瞬变方程被用于计算速度的两个分量,第三个速度分量则通过连续性方程进行计算得到。根据半人工瞬变方程组的特点和流动区域的特性,本方法采用半交错不等距非正交曲线贴体混合网格系进行数值计算,并利用质点导数差分格式使计算更简便。本文以圆管中不可压缩流体对圆柱的三维定常绕流问题为算例,具体画出计算用的半交错不等距非正交曲线贴体混合网格系,介绍三维半人工瞬变法的计算方法和步骤,并通过数值计算得到了此算例的计算结果。

 
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