ABSTRACT
For geophysical simulations in the spherical geometry, a family of overset grids named Yin-Yang is proposed. The Yin-Yang grid is based on the dissection of a spherical surface into two identical (exactly the same shape and size) subregions. Each subregion of a sphere is patched by the low-latitude part of the usual latitude-longitude grid. The two identical component grids are combined in a complemental way to cover a spherical surface with partial overlap on their borders. High performance of the Yin-Yang grid on a massively parallel computer is demonstrated by an application to geodynamo simulation.