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多变量拟协调元法解流函数形式的两维Navier-Stokes方程
引用本文:唐立民,刘迎曦.多变量拟协调元法解流函数形式的两维Navier-Stokes方程[J].大连理工大学学报,1987(1).
作者姓名:唐立民  刘迎曦
作者单位:大连工学院工程力学研究所 (唐立民),大连工学院工程力学研究所(刘迎曦)
基金项目:中国科学院科学基金资助的课题
摘    要:本文应用多变量拟协调元方法解二维N—S方程,克服了C1类连续性条件给流函数方法带来的困难,采用文中提供的单元列式,可以构造出一族适于该方程计算 的低参数三角形和四边形单元。这种列式以显式的形式出现.在形成单元矩阵过程中. 不必进行数值积分,减少了计算量。本文讨论了虚功(率)原理和伪变分原理(Psuedo- Variational Principle)在 N—S方程上的应用,并构造出一种适用于低参数单元的 伪变分原理泛函,最后,推导出一种九参数三角形流函数单元,进行了数值试验,说 明本文提供的方法和单元,具有较高的计算精度,且有一定的实用意义。

关 键 词:流体动力学  有限元法  流函数/多变量拟协调元法  为变分原理  C1-协调性

Two Dimensional Navier-Stokes Equations of Stream-Function Formulation Solved hy Multivariate Quasi-Conforming Techniques
Tang Limin,Liu Yingxi.Two Dimensional Navier-Stokes Equations of Stream-Function Formulation Solved hy Multivariate Quasi-Conforming Techniques[J].Journal of Dalian University of Technology,1987(1).
Authors:Tang Limin  Liu Yingxi
Abstract:In this paper the 2-D N-S equations of stream-function is solved by Mult- variate Quasi-Conforming (MQC) technique to overcome the C1 continuity. By using the element formulation presented here, a family of lower order triangular and quadrilateral elements can be constructed. These formulations are explicit in form, no numerical integrations are required. In this paper the psuedo-variatio- nal principle applying to N-S equations is discussed, and the corresponding fu- nction suitable for lower order elements is also given. Finally, a numerical test for proposed 9-parameter triangul ar stream-function element is demonstrated with relatively high precision.
Keywords:fluid dynamics  finite element methods  stream function/multiva- riate quasi-conforming technique  psuedo-variational principle  C 1-continuity
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