A crucial aspect of 3D Monte Carlo radiative transfer is the choice of the spatial grid used to partition the dusty medium. We critically investigate the use of octree grids in Monte Carlo dust radiative transfer, with two different octree construction algorithms (regular and barycentric subdivision) and three different octree traversal algorithms (top-down, neighbour list, and the bookkeeping method). ... The total number of grid cells, however, depends on the geometry of the model. ...

... IC 443 supernova remnant 10 / 37 IC 443 ­ 2MASS 11 / 37 SNR E0102-72 12 / 37 Protostellar jets 13 / 37 Jump Conditions unshocked gas at rest shock frame · Conser vation of mass, momentum and energy fluxes across shock front v B2 8 P B2 v2 + + - 1 4 Bv v2 + P + 1 2 v 14 / 37 Strong shocks · For v s vA , cs and 1 the jump conditions reduce to 2 B2 v1 + 1 = = =4 1 B1 v2 - 1 T2 2 3 mvs 1.4 в 10 16 k 5 (for = 5/3 ... The shock then collapses with the loss of internal pressure support (4). ...

CURRENT SHEET ENERGETICS, FLARE EMISSIONS, AND ENERGY PARTITION IN | SIMULATED AND OBSERVED SOLAR ERUPTIONS | ... We investigate coronal energy flow during a simulated coronal mass | ejection (CME), and compare observable characteristics of the simulation| |to observed eruptions. ... in the energy equation. ... flowing out the sides of the current sheet, the energy flowing out the | lower tip of the current sheet, and the energy flowing out the upper tip| |of the current sheet. ...

... COMPUTER SIMULATION OF RADIOWAVE MULTIPLE SCATTERING EFFECTS IN IONOSPHERE USING MONTE-CARLO METHOD . ... Distribution of reflected radiation on the ground is computed. ... Such influence can be remarkable if the scattering is multiple, i.e. the optical thickness for the scattering process is considerably greater than a unit. ... Radiation energy transfer in the slab is modeled by distribution of some particles carring small portions of radiation energy. ... The isotropic plasma approximation is...

... Abstract: We present Monte Carlo radiative transfer simulations for spiral galaxies modelled as a stellar disk and a two-phase clumpy dust distribution. ... As a general result, clumpy models are less opaque than the corresponding homogeneous models. ... 0.00 0.15 0.50 0.1 0.5 1.0 2.0 5.0 10.0 0.25 X . ... We have also produced several homogeneous models, to compare to the clumpy models. ... Homogeneous and clumpy models with the same tauV have the same dust mass. ...

... 8 February , 2014 SAI seminar (Ryde et al 2010) 5 Thermal emission from GRB jet progenitor observer photon jet Photosphere (=1) · · · · Photons are not produced at the photosphere We have to calculate radiative transfer We need to know where the photons are produced We construct the expression for effective optical depth in relativistic flow considering random walk process in relativistic flow SAI seminar 6 8 ... 8 February, 2014 SAI seminar 28 ...

... Models of central engines (1) Potential of disk accretion onto stellar mass black holes: disk binding energy: thin disk life time: - accreted mass - disk outer radius - gravitational radius - Shakura­Sunyaev parameter Ultra-dense Hyper-Eddington neutrino cooled disks !! ... 1989); Neutron star + Neutron star Neutron star + Black hole White dwarf + Black hole Black hole + compact disk Burst duration: 0.1s ­ 1.0s Released binding energy: (1.2) Collapsars­ origin of long duration GRBs? ...

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... Гидродинамическое моделирование ветра из газо-пылевого тора в активных ядрах галактик // Kallman T., Proga D. We report on time-dependent axisymmetric simulations of an X-ray excited flow from a parsec-scale, rotating, cold torus around an active galactic nucleus. Our simulations account for radiative heating and cooling and radiation pressure force. ... We computed synthetic spectra predicted by our simulations. ...

... Coherent structures (large-scale instabilities, nonlinear stabilization, the influence of helicity and rotation, structure forming precursors, numerical simulations of coherent structure evolutions, applications in hydrodynamics, plasmas and natural disasters forecasting), . ...

Numerical simulation of electromagnetic scattering by morphologically complex objects Janna M. Dlugach*, Michael I. Mishchenko** *Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine **NASA Goddard Institute for Space Studies, New York, USA Radiation mechanisms of astrophysical objects: classics today 21 ­ 25 September, 2015, St.Petersburg. ... Phase angle dependence of the degree of linear polarization for the center of the Jovian disk. ...

The head of laboratory is Prof. Vladimir A. Cherepenin, e-mail: cher@cplire.ru . The main research field of the laboratory is computer simulation of physics processes in radio science and electronics. ... development of numerical models for coherent radiation of relativistic electron beams in open and superdimentional electromagnetic structures; . ... Computational physics laboratory is concerned with organization and development of computer network in the institute. ...

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Geoff Bicknell, Alexander Wagner We are engaged in the following computationally intensive projects related to Black Hole and other energetic phenomena. Accretion disks. ... We envisage that we will determine the way in which gravitational energy is channeled into the high temperature coronae of black hole accretion disks and into relativistic jets and winds. ... Feedback from black holes and starbursts. ... COALA : Universe Galaxy AGN Star Planet ...

... Science . ... Science Users Information > Science Activities > PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: Mass transfer in interacting binaries - numerical simulations . ... Science Users Information . ... Observing with ESO Telescopes . ... ESO Science Newsletter . ... Using numerical simulations with the Smoothed Particle Hydrodynamics method, I propose to study such mass transfer in detail and compare the results with observations. ... Return to list of thesis topics . ...

Structure Formation : Bright side of the Universe Anatoly Klypin New Mexico State University Also: Stefan Gottloeber (Astrophysikalisches Institut Potsdam) Gustavo Yepes (UAM, Madrid) Cosmological ... -body+hydro simulations Codes: SPH + TREE AMR + shock capturing hydro Physical processes: Compton cooling/heating on CMB Radiative gas cooling Star formation with simple approximations Metal enrichment Energy/momentum feedback from young stars and SN Galaxies too concentrated. ...

Astronomy Picture of the Day . ... Consider this "star in a box". Of course, the box is actually a computational box consisting of a three dimensional grid of points, and the star is a virtual one whose physical properties and internal dynamics are numerically simulated at the points on the grid. ... This picture is a movie frame from a recent numerical simulation of a supergiant star with properties intended to approximate the real star Betelgeuse . ... U. Based on Astronomy Picture Of the Day . ...

... Investigation into dynamics of in-orbit radiological situation both in Service Module and the ISS RS docking module, as well as accumulated radiation doses in anthropomorphic and spherical phantoms. ... Measurement of spatial and solid distributions of radiation characteristics of space ionizing radiation in pressurized compartments of Service Module and Docking Module of the ISS RS by means of scientific equipment PDA (Assembly of Passive Detectors) and Phantom (Spherical Tissue-Equivalent Phantom)...

We present preliminary results of modelling 2D magnetic reconnection in the solar transition region environment. ... The formation of asymmetric reconnection jets is demonstrated in this study. Nonlinear anisotropic thermal conduction, radiative losses, and volumetric heating are included in the energy equation in order to investigate the formation of reconnection jets more precisely, as these processes are of fundamental importance at that region. ...