Japan Geoscience Union Meeting 2022

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-GI General Geosciences, Information Geosciences & Simulations

[M-GI33] Computational sciences on the universe, galaxies, stars, planets, and their environments

Mon. May 23, 2022 9:00 AM - 10:30 AM Exhibition Hall Special Setting (1) (Exhibition Hall 8, Makuhari Messe)

convener:Yoshi-Yuki Hayashi(Department of Planetology/CPS, Graduate School of Science, Kobe University), convener:Junichiro Makino(Kobe University), Kanya Kusano(Institute for Space-Earth Environmental Research, Nagoya University), convener:Eiichiro Kokubo(Division of Science, National Astronomical Observatory of Japan), Chairperson:Eiichiro Kokubo(Division of Science, National Astronomical Observatory of Japan)

10:00 AM - 10:15 AM

[MGI33-05] Improvement of the non-interpolated semi-Lagrangian method

*okazaki kohei1, enomoto takeshi1 (1.Kyoto University)

Keywords:semi-Lagrangian method, tracer advection, sphere

The semi-Lagrangian method, which is not constrained by the CFL condition, allows a several times longer time step than that of the Eulerian method. The non-interpolation scheme proposed by Ritchie (1987) does not require interpolation commonly used in the semi-Lagrangian method. This study proposes an improved non-interpolation and its accuracy is evaluated in several test cases for tracer advection on a sphere. The improved non-interpolation advection scheme is more accurate than the non-interpolation method of Ritchie (1987). It is also more accurate with less grid point information than existing interpolation methods, and is pseudo-mass conserving.