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1 Numerical Methods for Geodynamo Simulation Akira Kageyama Earth Simulator Center, JAMSTEC, Japan Part 2
2 Geodynamo Simulations in a Sphere or a Spherical Shell
3 Outline 1. Various numerical methods used in the spherical geodynamo simulation 2. How to make a large scale simulation code A sample Fortran90 code for kinematic dynamo in a box geometry. Basic and useful Fortran90 features. A sample data analysis (visualization) program.
4 Methods used in geodynamo simulations Spectral-based methods Spherical harmonics expansion Double Fourier expansion Beltrami function expansion Other methods Finite difference method Finite volume method Finite element method Cartesian grid method
5 (1) FDM: Finite Difference Method r=1 x
6 (2) FVM: Finite Volume Method cell average
7 (3) FEM: Finite Element Method (periodic) Partially linear function 1
8 (4) Spectral Method Expansion by a set of orthonormal basis. Example: Fourier functions.
9 Geodynamo simulation To solve this kind of PDE system in the spherical geometry.
10 Geodynamo simulation by full FDM Lat-lon (latitude-longitude) grid Coordinate singularity? ===> No problem.
11 回転系の方程式のオイラー的導出について Geodynamo simulation by full FDM Lat-lon (latitude-longitude) grid Kageyama et al., 1997, 1999
12 Geodynamo simulation by FVM H. Harder and U. Hansen: on a cubic projected grid P. Hejda and M. Reshetnyak: on the latitude-longitude grid
13 Geodynamo simulation by FEM Matsui and Okuda
14 Geodynamo simulation by FEM K.H. Chan, Ligang Li, and Xinhao Liao, 2006,
15 Gedynamo simulation by FDM on Cartesian grid D.G. McMillan and G.R. Sarson, 2005
16 Geodynamo simulation by spectral method 2-D sphere (circle) x 3-D sphere
17 Spherical harmonics Normalized spherical harmonics Expand physical variables by the spherical harmonics and timeintegrate them in the spectral space. The method used in most ( >90%?) geodynamo simulations.
18 Pseudo-spectral method for nonlinear terms Spectral space Real space Spherical harmonics transform Spherical harmonics transform = Fourier transform + Legendre transform
19 Legendre transform For Fourier transform, fast algorithm exists: FFT - O(M log M) But for Legendre transform, there is no fast (practical) algorithm: - O(L 2 ) Data size - O(LM) Computation for MHD eqs. - O(LM) Computations for transformation - O(L 2 M log M) >> O(LM)
20 Numerical methods for spherical shell geometry (1) FDM (only) in the radial direction r r i r o r (2) Spectral method in radial direction Chebyshev polynomials
21 Chebyshev polynomials Definition: Orthogonal relation: Fast Fourier Cosine Transform: Naturally high resolution on the outer and inner spherical boundaries:
22 Geodynamo simulation by the fully spectral method Glatzmaier and many others
23 Geodynamo simulation by Fourier + FDM Oishi, Sakuraba, and Hamano, 2007 Hejda and Reshetnyak, 2000
24 Double Fourier transform method Nishikawa and Kusano
25 Spectral Method for a full sphere (or a ball) Sphere (surface) Ball
26 Beltrami field Beltrami field = Eigen-vector of the curl operator: - As a fluid flow, a Beltrami field gives a solution of the stationary Euler equation: - For MHD, a Beltrami field is a force-free magnetic field:
27 Beltrami fields Beltrami fields in a simply connected domain V, like a ball, form a set of complete orthogonal system. - Boundary condition on the surface of V, - Orthogonal relation:
28 Orthogonality of Beltrami fields
29 Beltrami fields in a ball - A solution of the Helmholtz equation gives a Beltrami field in the form spherical Bessel functions P. D. Mininni and D. C. Montgomery, Phys. Fluids 18, (2006)
30 MHD dynamo simulation in a ball by the spectral method based on Beltrami expansion P. D. Mininni, D. C. Montgomery, and L. Turner, arxiv:physics/070208, (2007)
31 Outline 1. Various numerical methods used in the spherical geodynamo simulation 2. How to make a large scale simulation code A sample Fortran90 code for kinematic dynamo in a box geometry. Basic and useful Fortran90 features. A sample data analysis (visualization) program.
32 Source codes In source_codes.tar.gz, - src/kindanb/src: kinematic dynamo code - src/kindanb/analizer/: visualization code
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