Geodynamo and mantle convection simulations on the Earth Simulator using the Yin–Yang grid
نویسندگان
چکیده
We have developed finite difference codes based on the Yin-Yang grid for the geodynamo simulation and the mantle convection simulation. The Yin-Yang grid is a kind of spherical overset grid that is composed of two identical component grids. The intrinsic simplicity of the mesh configuration of the Yin-Yang grid enables us to develop highly optimized simulation codes on massively parallel supercomputers. The Yin-Yang geodynamo code has achieved 15.2 Tflops with 4096 processors on the Earth Simulator. This represents 46% of the theoretical peak performance. The Yin-Yang mantle code has enabled us to carry out mantle convection simulations in realistic regimes with a Rayleigh number of 10 including strongly temperaturedependent viscosity with spatial contrast up to 10.
منابع مشابه
Development of Numerical Methods for Geodynamo and Mantle Convection Simulations
2. Development of New Spherical Grid: Yin-Yang Grid Since the finite difference method enables us to make highly optimized programs for massively parallel computers, we exploit the possibility of the finite difference method for simulations in spherical shell geometry with radius r (ri ≤ r ≤ ro), colatitude θ (0 ≤ θ ≤ π), and longitude φ (0 ≤ φ < 2π). Because there is no grid mesh that is ortho...
متن کاملApplication of the Yin-Yang grid to a thermal convection of a Boussinesq fluid with infinite Prandtl number in a three-dimensional spherical shell
A new numerical finite difference code has been developed to solve a thermal convection of a Boussinesq fluid with infinite Prandtl number in a three-dimensional spherical shell. A kind of the overset (Chimera) grid named “YinYang grid” is used for the spatial discretization. The grid naturally avoids the pole problems which are inevitable in the latitude-longitude grids. The code is applied to...
متن کاملVisualization in the Earth Sciences: A Discussion on Various Visualization Methods using amira
It is widely acknowledged that an important aspect in Earth Science research is the ability to visualize huge amounts of data resulting from numerical simulations or data acquisition. Whether the data is a simple two-dimensional plot or a three-dimensional multivariate grid, the ability to visualize the data is imperative for researchers to properly demonstrate results. This poster will examine...
متن کاملThe influence of potassium on core and geodynamo evolution
S U M M A R Y We model the thermal evolution of the core and mantle using a parametrized convection scheme, and calculate the entropy available to drive the geodynamo as a function of time. The cooling of the core is controlled by the rate at which the mantle can remove heat. Rapid core cooling favours the operation of a geodynamo but creates an inner core that is too large; slower cooling redu...
متن کاملHigh Resolution Geodynamo Simulation by Yin-Yang Grid and its Visualizations
The highest resolution simulation of geodynamo is performed. The base grid system is the Yin-Yang grid, a spherical overset grid with two congruent components each of which is a part of the usual spherical polar coordinates. High parallelization rate of the Yin-Yang geodynamo code has enabled us to perform the geodynamo simulation with the viscosity one order of magnitude smaller than the previ...
متن کامل