Poroelastoplastic modeling of borehole shear bands on high order curvilinear meshes using CUDA technology

<p>The presentation describes an approach to solving problems of modeling the development of zones of localization of plastic deformations within the framework of a poroelastoplastic model generalizing Biot's model. A distinctive feature of this model is a two-way coupling between mechanical processes occurring in a porous elastoplastic matrix and a saturating viscous fluid.</p><p>  For the numerical solution of the problem, a variational formulation based on the Galerkin method and the isoparametric  spectral element method (SEM) is used to discretize the geometric model and PDEs on curvilinear unstructured SEM meshes. SEM orders up to the 15th were used for calculations.</p><p>  The software implementation of the developed algorithm based on SEM is performed using CUDA. A spectral element mesh is naturally mapped to a CUDA grid of SMs, and accordingly, each spectral element is mapped to a streaming block, within which individual nodes are processed by the corresponding threads within the block.</p><p><span>The research for this article is performed partially in Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences and supported by the Russian Science Foundation under grant № 19-77-10062.</span></p>

Seismogravity processes observed in the course of development of the 2011 Tohoku earthquake

The analysis of the seismogravity processes accompanying the process of development of the tsunamigenic Great East Japan (Tohoku) Earthquake is carried out. Original data and most of the scientific results were obtained at the Geophysical Observatory in Northern Caucasus operated by the Schmidt Institute of Physics of the Earth, Russian Academy of Sciences in collaboration with the Federal Research for Geophysical Service of the Russian Academy of Sciences. Specific attention is focused on the analysis of the structure of the registered seismic processes and the accompanying gravitomagnetic disturbances observed immediately prior to the main seismic event.

Archaeomagnetic studies at Schmidt institute of physics of the earth, Russian Academy of Sciences: history and main results

The archaeomagnetic studies carried out at the Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences (IPE RAS) provided an important contribution to the international studies of the main magnetic field of the Earth for the past few thousand years. Extensive data on the intensity of geomagnetic field in the past 8000 years were obtained. Four most representative and long time series of the data have been constructed for Eurasia for the Iberian Peninsula, the Caucasus, Central Asia, and Siberia. Unique studies having no analogues in international research have been carried out into rapid variations in the geomagnetic field intensity with characteristic times starting from several tens of years. Based on the analysis of the international data on the ancient geomagnetic field, the spectrum of the variations in the geomagnetic field intensity with the periods ranging from decades to millennia was established and the characteristics ofthe variations whose superposition can describe the pattern of the changes of the geomagnetic field intensity were determined. It was found out that variations with different characteristic times have a differently directed drift, and the “main oscillation” with a characteristic time of 8000 years has an eastern drift.

Thermal regime of the earth’s lithosphere and the mantle: geothermal studies at IPE RAS

The paper is devoted to a historical retrospective of the development of geothermal research in the former Soviet Union. The detailed history of the Laboratory of geothermics at the Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences (IPE RAS) from the mid-1950s to the mid-1980s when a full range of geothermal studies were conducted by the laboratory is presented. The main results with the special focus on the world-level achievements made by IPE RAS in this field are outlined. The second part of the paper addresses the key recent results including the theoretical studies of heat and mass transfer and numerical modeling of mantle convection.

Topical problems in the theory of planet formation: formation of planetesimals

The development of the Earth’s and planets formation theory over 70 years is considered with a special focus on the history of development of this theory at the Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences (IPE RAS) where this direction of research was founded by Otto Schmidt. The state of the art of the theory is outlined. In particular, the planetesimals formation problem currently belonging to the key unsolved issues in the theory of planet formation is discussed. Recent results of the studies aimed at solving this problem at IPE RAS are presented.

Comparative planetology in IPE RAS

The review of the studies on comparative planetology carried out in the Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences is presented. The obtained results are described in accordance with the study objects: the Moon, terrestrial planets, Venus and Mars, Phobos and Deimos-moons of Mars, giant planets and their moons.