A Fast Sine Transform Accelerated High-Order Finite Difference Method for Parabolic Problems over Irregular Domains

In this paper, a new Cartesian grid finite difference scheme is introduced for solving parabolic initial-boundary value problems involving irregular domains and Robin boundary condition in two and three dimensions. In spatial discretization, a ray-casting matched interface and boundary (MIB) method...

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Vydáno v:Journal of scientific computing Ročník 95; číslo 2; s. 49
Hlavní autoři: Li, Chuan, Ren, Yiming, Long, Guangqing, Boerman, Eric, Zhao, Shan
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York Springer US 01.05.2023
Springer Nature B.V
Témata:
Algorithms
Boundary conditions
Boundary value problems
Cartesian coordinates
Computational Mathematics and Numerical Analysis
Dirichlet problem
Discretization
Finite difference method
Interfaces
Mathematical analysis
Mathematical and Computational Engineering
Mathematical and Computational Physics
Mathematics
Mathematics and Statistics
Methods
Numerical analysis
Partial differential equations
Theoretical
Robin boundary condition
Parabolic initial-boundary value problems
65M06
Fast Fourier transform (FFT)
65M85
Irregular domains
65M12
Matched interface and boundary (MIB)
ISSN:0885-7474, 1573-7691
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Popis
Shrnutí:In this paper, a new Cartesian grid finite difference scheme is introduced for solving parabolic initial-boundary value problems involving irregular domains and Robin boundary condition in two and three dimensions. In spatial discretization, a ray-casting matched interface and boundary (MIB) method is utilized to enforce different types of boundary conditions, including Dirichlet, Neumann, Robin, and their mixed combinations, along the normal direction to generate necessary fictitious values outside the irregular domain. This allows accurate approximations of jumps in derivatives at various boundary locations so that the fourth-order central difference can be corrected at all Cartesian nodes. By treating such corrections as additional unknowns, the order of finite difference discretization of the Laplacian operator can be preserved. Moreover, by constructing corrections for different types of irregular and corner points, the proposed augmented MIB (AMIB) method can accommodate complicated geometries, while maintaining the fourth order of accuracy in space. In temporal discretization, the standard Crank–Nicolson scheme is employed, which is second-order in time and unconditionally stable. Furthermore, a Fast Sine Transform acceleration algorithm is employed to efficiently invert the discrete Laplacian, so that the augmented linear system in each time step can be solved with a complexity of O ( N log N ) , where N stands for the total spatial degree-of-freedom. The accuracy, stability and efficiency of the proposed AMIB method are numerically validated by considering various parabolic problems in two and three dimensions.
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ISSN:0885-7474
1573-7691
DOI:10.1007/s10915-023-02177-7