Catálogo de publicaciones - libros

We describe the methods for realistic three-dimensional, time-dependent simulations of the interaction between convective flows, magnetic field and radiation near the visible solar surface and show some results recent of our computations: 1) the formation of magnetic patterns and small-scale intense magnetic fields for different amount of magnetic flux in the computational domain and, 2) the structure and dynamics of a larger flux concentration, a so-called pore. Experiences with running our code on the Hitachi SR80000 of HLRB are briefly described.

In deformations of polynomial functions one may encounter “singularity exchange at infinity” when singular points disappear from the space and produce “virtual” singularities which have an influence on the topology of the limit polynomial. We find several rules of this exchange phenomenon, in which the total quantity of singularity turns out to be not conserved in general.

We report advances in simulating wave propagation in the Earth's interior in 2D and 3D using several numerical methods. For the Earth's deep interior simulations are carried out on a global scale using axi-symmetric models and 3D spherical sections. In addition, we calculate earthquake scenarios on a regional scale for prediction of ground motion (e.g. peak motion amplitude, shaking duration), taking into account amplification effects of low velocity zones in active faults and basin structures, topography effects, shear wave splitting effects due to anisotropy and attenuation due to visco-elasticity. These predictions may be useful for risk evaluation and civil engineering purposes. We further simulate earthquake sources as dynamic fault ruptures in the context of typical fault-zone velocity structures and material interfaces. As observations of earthquake-induced ground rotations are becoming available we investigate systematically the effects of 3D heterogeneity on rotational motions.