Download A Parallel Multilevel Partition of Unity Method for Elliptic by Marc Alexander Schweitzer PDF

By Marc Alexander Schweitzer

The numerical therapy of partial differential equations with meshfree discretization concepts has been a really lively learn sector lately. in the past, in spite of the fact that, meshfree tools were in an early experimental level and weren't aggressive because of the loss of effective iterative solvers and numerical quadrature. This quantity now provides an effective parallel implementation of a meshfree approach, particularly the partition of team spirit strategy (PUM). A normal numerical integration scheme is gifted for the effective meeting of the stiffness matrix in addition to an optimum multilevel solver for the coming up linear procedure. in addition, precise details at the parallel implementation of the strategy on dispensed reminiscence pcs is equipped and numerical effects are provided in and 3 area dimensions with linear, greater order and augmented approximation areas with as much as forty two million levels of freedom.

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Boundary Conditions 33 we would introduce an additional surface term in the variational formulation to enforce the boundary conditions. This penalty term may change the properties of the functional and we need to be concerned with the issues of existence and uniqueness of a solution. , again we would experience a reduction in the approximation quality of the overall method just because of the inappropriate treatment of boundary conditions. The Lagrange multiplier method is a general approach toward the solution of constrained minimization problems which is also used in the finite element [5, 21] and wavelet [87] context to implement essential boundary conditions.

2. 2. 13). The boundary conditions are implemented by Nitsche's method. 1. t(d) = ~ + 1 for d:::: 3 [117 , 124]. The Loo -norm is usually approximated by the maximum over the nodal values, where we can most often observe a super· convergence of order h 2 • We, however, may not use such a nodal approximation in our method since the PUM shape functions 'Pi'l/Ji are noninterpolatory and the Legendre polyno· mials 'l/Ji of odd degree vanish at Xi . Hence, we cannot expect to measure h 2 super· convergence in the L oo -norm.

5. 5 (right) . The support of a single shape function is indicated by the gray shaded area. 6. 1. See Color Plate 1 on page 173. 1. 6. , we use Pi = P = 1. 3. The number of degrees of freedom dof is given by 3N where N = card(P) = card(Cn) denotes the number of points (or cover patches) in this two-dimensional example. 3. 1. 1. 500 by increasing the refinement level l of the underlying uniform grid.

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