Unit Setting Method to Impose EBCs in Meshless Methods

作者：Yang, W. L.; Nie, Y. F.^*; Wu, Y. T.

来源：Computer Modeling in Engineering & Sciences, 2011, 79(3-4): 261-270.

• moving least square approximation
• generalized parameter
• element-free Galerkin method
• essential boundary conditions

Up to now, some methods have been proposed to impose essential boundary conditions (EBCs) in meshless methods to solve partial differential equations system. Based on the theory analysis about moving least square (MLS) approximation and numerical experimentation results, a very simple method to impose EBCs in element-free Galerkin methods, which is the same easy as in finite element methods, is posed here. Compared with Lagrange multiplier method, the new method is simple and gives better results at the distributed nodes. The new method dues to a view point, different from normal understanding, that taking generalized parameters in MLS approximations as the approximate values of the unknown field function at the nodes. This key view point leads to directly using unit setting method or large number setting method in the discrete equations system to impose EBCs in element-free Galerkin (EFG) method.

• 出版日期2011-9
• 单位西北工业大学