1. Adaptive mesh fluid simulations on GPU

    New Astronomy 15(7):581 (2010)

    We describe an implementation of compressible inviscid fluid solvers with block-structured adaptive mesh refinement on Graphics Processing Units using NVIDIA’s CUDA. We show that a class of high resolution shock capturing schemes can be mapped naturally on this architecture. Using the metho...
  2. Adaptive mesh fluid simulations on GPU

    New Astronomy 15(7):581 (2010)

    We describe an implementation of compressible inviscid fluid solvers with block-structured adaptive mesh refinement on Graphics Processing Units using NVIDIA’s CUDA. We show that a class of high resolution shock capturing schemes can be mapped naturally on this architecture. Using the metho...
  3. The formation of Population III binaries from cosmological initial conditions.

    Science 325(5940):601 (2009) PMID 19589964

    Previous high-resolution cosmological simulations predicted that the first stars to appear in the early universe were very massive and formed in isolation. Here, we discuss a cosmological simulation in which the central 50 M(o) (where M(o) is the mass of the Sun) clump breaks up into two cores h...
  4. The formation of Population III binaries from cosmological initial conditions.

    Science 325(5940):601 (2009) PMID 19589964

    Previous high-resolution cosmological simulations predicted that the first stars to appear in the early universe were very massive and formed in isolation. Here, we discuss a cosmological simulation in which the central 50 M(o) (where M(o) is the mass of the Sun) clump breaks up into two cores h...
  5. The formation of the first star in the Universe.

    Science 295(5552):93 (2002) PMID 11711636

    We describe results from a fully self-consistent three-dimensional hydrodynamical simulation of the formation of one of the first stars in the Universe. In current models of structure formation, dark matter initially dominates, and pregalactic objects form because of gravitational instability fr...
  6. The formation of the first star in the Universe.

    Science 295(5552):93 (2002) PMID 11711636

    We describe results from a fully self-consistent three-dimensional hydrodynamical simulation of the formation of one of the first stars in the Universe. In current models of structure formation, dark matter initially dominates, and pregalactic objects form because of gravitational instability fr...
  7. Multi-dimensional cosmological radiative transfer with a Variable Eddington Tensor formalism

    New Astronomy 6(7):437 (2001)

    We present a new approach to numerically model continuum radiative transfer based on the Optically Thin Variable Eddington Tensor (OTVET) approximation. Our method insures the exact conservation of the photon number and flux (in the explicit formulation) and automatically switches from the ...
  8. Modeling primordial gas in numerical cosmology

    New Astronomy 2(3):181 (1997)

    We have reviewed the chemistry and cooling behavior of low-density (n ≲ 10 4 cm −3) primordial gas and devised a model which involves 19 collisional and 9 radiative processes and is applicable for temperatures in the range 1 K < T < 10 8K. In a companion paper (Anni...
  9. Cosmological hydrodynamics with multi-species chemistry and nonequilibrium ionization and cooling

    New Astronomy 2(3):209 (1997)

    We have developed a method of solving for multi-species chemical reaction flows in nonequilibrium and self-consistently with the hydrodynamic equations in an expanding FLRW universe. The method is based on a backward differencing scheme for the required stability when solving stiff sets of ...
  10. Modeling primordial gas in numerical cosmology

    New Astronomy 2(3):181 (1997)

    We have reviewed the chemistry and cooling behavior of low-density (n ≲ 10 4 cm −3) primordial gas and devised a model which involves 19 collisional and 9 radiative processes and is applicable for temperatures in the range 1 K < T < 10 8K. In a companion paper (Anni...