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  1. Research

    Entropy-limited hydrodynamics: a novel approach to relativistic hydrodynamics

    We present entropy-limited hydrodynamics (ELH): a new approach for the computation of numerical fluxes arising in the discretization of hyperbolic equations in conservation form. ELH is based on the hybridisat...

    Federico Guercilena, David Radice and Luciano Rezzolla

    Computational Astrophysics and Cosmology 2017 4:3

    Published on: 4 July 2017

  2. Research

    The black hole accretion code

    We present the black hole accretion code (BHAC), a new multidimensional general-relativistic magnetohydrodynamics module for the MPI-AMRVAC framework. BHAC has been designed to solve the equations of ideal genera...

    Oliver Porth, Hector Olivares, Yosuke Mizuno, Ziri Younsi, Luciano Rezzolla, Monika Moscibrodzka, Heino Falcke and Michael Kramer

    Computational Astrophysics and Cosmology 2017 4:1

    Published on: 3 May 2017

  3. Methodology

    The evolution of hierarchical triple star-systems

    Field stars are frequently formed in pairs, and many of these binaries are part of triples or even higher-order systems. Even though, the principles of single stellar evolution and binary evolution, have been ...

    Silvia Toonen, Adrian Hamers and Simon Portegies Zwart

    Computational Astrophysics and Cosmology 2016 3:6

    Published on: 23 December 2016

  4. Research

    Riemann solvers and Alfven waves in black hole magnetospheres

    In the magnetosphere of a rotating black hole, an inner Alfven critical surface (IACS) must be crossed by inflowing plasma. Inside the IACS, Alfven waves are inward directed toward the black hole. The majority...

    Brian Punsly, Dinshaw Balsara, Jinho Kim and Sudip Garain

    Computational Astrophysics and Cosmology 2016 3:5

    Published on: 13 September 2016

  5. Research

    In situ and in-transit analysis of cosmological simulations

    Modern cosmological simulations have reached the trillion-element scale, rendering data storage and subsequent analysis formidable tasks. To address this circumstance, we present a new MPI-parallel approach fo...

    Brian Friesen, Ann Almgren, Zarija Lukić, Gunther Weber, Dmitriy Morozov, Vincent Beckner and Marcus Day

    Computational Astrophysics and Cosmology 2016 3:4

    Published on: 24 August 2016

  6. Research

    Simulations of stripped core-collapse supernovae in close binaries

    We perform smoothed-particle hydrodynamical simulations of the explosion of a helium star in a close binary system, and study the effects of the explosion on the companion star as well as the effect of the pre...

    Alex Rimoldi, Simon Portegies Zwart and Elena Maria Rossi

    Computational Astrophysics and Cosmology 2016 3:2

    Published on: 1 March 2016

  7. Research

    Stationary relativistic jets

    In this paper we describe a simple numerical approach which allows to study the structure of steady-state axisymmetric relativistic jets using one-dimensional time-dependent simulations. It is based on the fac...

    Serguei S Komissarov, Oliver Porth and Maxim Lyutikov

    Computational Astrophysics and Cosmology 2015 2:9

    Published on: 5 November 2015

  8. Software

    Sapporo2: a versatile direct N-body library

    Astrophysical direct N-body methods have been one of the first production algorithms to be implemented using NVIDIA’s CUDA architecture. Now, almost seven years later, the GPU is the most used accelerator device ...

    Jeroen Bédorf, Evghenii Gaburov and Simon Portegies Zwart

    Computational Astrophysics and Cosmology 2015 2:8

    Published on: 15 October 2015

  9. Research

    PHEW: a parallel segmentation algorithm for three-dimensional AMR datasets

    We introduce phew (Parallel HiErarchical Watershed), a new segmentation algorithm to detect structures in astrophysical fluid simulations, and its implementation into the adaptive mesh refinement (AMR) code ramse...

    Andreas Bleuler, Romain Teyssier, Sébastien Carassou and Davide Martizzi

    Computational Astrophysics and Cosmology 2015 2:5

    Published on: 9 June 2015

  10. Software

    A calculator for Roche lobe properties

    The Roche lobe geometry is important to understand and study the properties of the mass-losing component in a semi-detached binary system. However it is not easy to calculate accurately, and existing tables us...

    Denis A Leahy and Janet C Leahy

    Computational Astrophysics and Cosmology 2015 2:4

    Published on: 6 May 2015

  11. Research

    Adaptive techniques for clustered N-body cosmological simulations

    ChaNGa is an N-body cosmology simulation application implemented using Charm++. In this paper, we present the parallel design of ChaNGa and address many challenges arising due to the high dynamic...

    Harshitha Menon, Lukasz Wesolowski, Gengbin Zheng, Pritish Jetley, Laxmikant Kale, Thomas Quinn and Fabio Governato

    Computational Astrophysics and Cosmology 2015 2:1

    Published on: 28 March 2015

  12. Research

    On the reliability of N-body simulations

    The general consensus in the N-body community is that statistical results of an ensemble of collisional N-body simulations are accurate, even though individual simulations are not. A way to test this hypothesis i...

    Tjarda Boekholt and Simon Portegies Zwart

    Computational Astrophysics and Cosmology 2015 2:2

    Published on: 28 March 2015

  13. Research

    A fast multipole method for stellar dynamics

    The approximate computation of all gravitational forces between N interacting particles via the fast multipole method (FMM) can be made as accurate as direct summation, but requires less than ...

    Walter Dehnen

    Computational Astrophysics and Cosmology 2014 1:1

    Published on: 11 September 2014

  14. Review

    On the origin of jets from disc-accreting magnetized stars

    A brief review of the origin of jets from disc-accreting rotating magnetized stars is given. In most models, the interior of the disc is characterized by a turbulent viscosity and magnetic diffusivity (‘alpha’...

    Richard VE Lovelace, Marina M Romanova, Patrick Lii and Sergei Dyda

    Computational Astrophysics and Cosmology 2014 1:3

    Published on: 11 September 2014

  15. Research

    Artificial viscosity in comoving curvilinear coordinates: towards a differential geometrically consistent implicit advection scheme

    We propose a modification for the tensor of artificial viscosity employable for generally comoving, curvilinear grids. We present a strong conservation form for the equations of radiation hydrodynamics for stu...

    Harald Höller, Antti Koskela, Ernst Dorfi and Werner Benger

    Computational Astrophysics and Cosmology 2014 1:2

    Published on: 11 September 2014

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