Development of general finite differences for complex geometries using a sharp interface formulation. (English) Zbl 1456.65142
Summary: We apply sharp interface boundary conditions to collocated meshfree approximations. Using the sharp interface formulation with the general finite difference (GFD) shape functions, we solve several test cases on meshfree grids with uniform and variable resolutions. Numerical results for the 2D Poisson equation indicate that the sharp interface formulation performs as well as the traditional collocated boundary approach with respect to both the convergence rate and accuracy. The analytic lid driven cavity results indicate that our discretization of a semi-implicit approximate projection scheme is indeed consistent and spatially converges at a second order rate under diffusive time stepping and at a first order rate under convective time stepping due to the first order in time splitting error. To resolve sharp gradients, variable resolution meshfree grids are considered for the classic lid driven cavity problem and for the uniform flow over a cylinder problem. Comparison to appropriate data sets indicate that our approach accurately estimates the various flow parameters using small cloud sizes of 13 neighbors while using high clustering ratios.
MSC:
| 65N06 | Finite difference methods for boundary value problems involving PDEs |
| 65N08 | Finite volume methods for boundary value problems involving PDEs |
| 35J05 | Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation |
Keywords:
general finite differences; sharp interface; collocated meshfree method; lid driven cavity; uniform flow over a cylinderReferences:
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