不完全雙二次有限體積元法
[Abstract]:Since the finite volume (element) method was put forward by Professor Li Ronghua in the late 1970s as the name of the generalized difference method, the research results have been produced one after another. This method involves two sets of mesh generation and two corresponding function spaces: the heuristic function space on the original mesh generation, the piecewise constant or the piecewise low degree polynomial space on the dual mesh generation, that is, the test function space. In this paper, the incomplete biquadratic finite element space is taken as the heuristic function space. The so-called incomplete double quadratic element means that the type function at every type value point on a primitive unit is an incomplete biquadratic polynomial. Its type value is defined on the four vertices and midpoints of the quadrilateral element. In this paper, the incomplete double quadratic element is studied, and a new numerical method, the incomplete double quadratic finite volume element method, is constructed. The test function space is the piecewise constant function space defined on the dual element, and the test function space takes the incomplete biquadratic finite element space with isoparametric function space, and the test function space takes the piecewise constant function space defined on the dual element. Four different dual meshes are constructed. The first two are non-degenerate dual meshes which are easy to think of, and the latter two are degenerate dual meshes. The finite volume schemes are established for four different meshes, and the stability analysis and convergence analysis are given. When the dual mesh is nondegenerate, the stable mesh ratio range is given, and the stability condition of the scheme is analyzed when the dual grid is degenerate. It is found that the minimum eigenvalue of the matrix of bilinear form is close to 0 or less than 0, which indicates that the bilinear form of bilinear form is not positive definite on a unit. Furthermore, it is proved that the incomplete biquadratic finite volume element method based on nondegenerate scheme is of second order convergence according to the metric of H1 norm. Finally, we use the constructed scheme to solve the Dirichlet problem of Poisson equation. The numerical results show that the numerical solutions of the first two schemes have the best convergence of order 2 according to the metric of the first two schemes, and the numerical solutions of the latter two schemes have the convergence of the first order according to the metric of the first norm. These results further verify the correctness of the theoretical analysis.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O241.8
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