A Particle-Partition of Unity Method Part V: Boundary Conditions
A Particle-Partition of Unity Method Part V: Boundary Conditions
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DOI:
10.1007/978-3-642-55627-2_27
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发表时间:
2003
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影响因子:
--
通讯作者:
M. Griebel;M. Schweitzer
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文献类型:
--
作者:
M. Griebel;M. Schweitzer
In this sequel to [12, 13, 14, 15] we focus on the implementation of Dirichlet boundary conditions in our partition of unity method. The treatment of essential boundary conditions with meshfree Galerkin methods is not an easy task due to the non-interpolatory character of the shape functions. Here, the use of an almost forgotten method due to Nitsche from the 1970’s allows us to overcome these problems at virtually no extra computational costs. The method is applicable to general point distributions and leads to positive definite linear systems. The results of our numerical experiments, where we consider discretizations with several million degrees of freedom in two and three dimensions, clearly show that we achieve the optimal convergence rates for regular and singular solutions with the (adaptive) h-version and (augmented) p-version.