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The role of magnetic fields in star formation

Title
The role of magnetic fields in star formation
Funding
ARC | Discovery Projects
Contract (GA) number
DP1094585
Start Date
2010/01/01
End Date
2012/12/31
Open Access mandate
no
Organizations
-
More information
http://purl.org/au-research/grants/arc/DP1094585

 

  • Simulating astrophysical magnetic fields with smoothed particle magnetohydrodynamics

    Tricco, Terrence Stanislaus (2017)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    Numerical methods to improve the treatment of magnetic fields in smoothed field magnetohydrodynamics (SPMHD) are developed and tested. A mixed hyperbolic/parabolic scheme is developed which "cleans" divergence error from the magnetic field. The method introduces a scalar field which is coupled to the magnetic field. A conservative form for the hyperbolic equations is obtained by first defining the energy content of the new field, then using it in the discretised Lagrangian to obtain equations...

    Collapse of a molecular cloud core to stellar densities: stellar core and outflow formation in radiation magnetohydrodynamics simulations

    Bate, Matthew R.; Tricco, Terrence S.; Price, Daniel J. (2013)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    We have performed smoothed particle radiation magnetohydrodynamics (SPRMHD) simulations of the collapse of rotating, magnetised molecular cloud cores to form protostars. The calculations follow the formation and evolution of the first hydrostatic core, the collapse to form a stellar core, the launching of outflows from both the first hydrostatic core and stellar cores, and the breakout of the stellar outflow from the remnant of the first core. We investigate the roles of magnetic fields and t...

    DUSTYBOX and DUSTYWAVE: Two test problems for numerical simulations of two fluid astrophysical dust-gas mixtures

    Laibe, Guillaume; Price, Daniel J. (2011)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    In this paper we present the analytic solutions for two test problems involving two-fluid mixtures of dust and gas in an astrophysical context. The solutions provide a means of benchmarking numerical codes designed to simulate the non-linear dynamics of dusty gas. The first problem, dustybox, consists of two interpenetrating homogeneous fluids moving with relative velocity difference. We provide exact solutions to the full non-linear problem for a range of drag formulations appropriate to ast...

    Dusty gas with SPH - I. Algorithm and test suite

    Laibe, Guillaume; Price, Daniel J. (2011)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    We present a new algorithm for simulating two-fluid gas and dust mixtures in Smoothed Particle Hydrodynamics (SPH), systematically addressing a number of key issues including the generalised SPH density estimate in multi-fluid systems, the consistent treatment of variable smoothing length terms, finite particle size, time step stability, thermal coupling terms and the choice of kernel and smoothing length used in the drag operator. We find that using double-hump shaped kernels improves the ac...

    On the accumulation of planetesimals near disc gaps created by protoplanets

    Ayliffe, Ben A.; Laibe, Guillaume; Price, Daniel J.; Bate, Matthew R. (2012)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    We have performed three-dimensional two-fluid (gas-dust) hydrodynamical models of circumstellar discs with embedded protoplanets (3 - 333 M\oplu) and small solid bodies (radii 10cm to 10m). We find that high mass planets (\gtrsim Saturn mass) open sufficiently deep gaps in the gas disc such that the density maximum at the outer edge of the gap can very efficiently trap metre-sized solid bodies. This allows the accumulation of solids at the outer edge of the gap as solids from large radii spir...

    A Switch for Artificial Resistivity and Other Dissipation Terms

    Tricco, Terrence; Price, Daniel (2013)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    We describe a new switch to reduce dissipation from artificial resistivity in Smoothed Particle Magnetohydrodynamics simulations. The switch utilises the gradient of the magnetic field to detect shocks, setting alpha_B = h |gradB| / |B|. This measures the relative degree of discontinuity, and the switch is not dependent on the absolute field strength. We present results comparing the new resistivity switch to the switch of Price & Monaghan (2005), showing that it is more robust in capturing s...

    A switch to reduce resistivity in smoothed particle magnetohydrodynamics

    Tricco, Terrence S.; Price, Daniel J. (2013)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    Artificial resistivity is included in Smoothed Particle Magnetohydrodynamics simulations to capture shocks and discontinuities in the magnetic field. Here we present a new method for adapting the strength of the applied resistivity so that shocks are captured but the dissipation of the magnetic field away from shocks is minimised. Our scheme utilises the gradient of the magnetic field as a shock indicator, setting {\alpha}_B = h|gradB|/|B|, such that resistivity is switched on only where stro...

    Collimated jets from the first core

    Price, Daniel J.; Tricco, Terrence S.; Bate, Matthew R. (2012)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    We have performed Smoothed Particle Magnetohydrodynamics (SPMHD) simulations demonstrating the production of collimated jets during collapse of 1 solar mass molecular cloud cores to form the `first hydrostatic core' in low mass star formation. Recently a number of candidate first core objects have been observed, including L1448 IRS2E, L1451-mm and Per Bolo 58, although it is not yet clear that these are first hydrostatic cores. Recent observations of Per Bolo 58 in particular appear to show c...

    Dusty gas with SPH - II. Implicit timestepping and astrophysical drag regimes

    Laibe, Guillaume; Price, Daniel J. (2011)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    In a companion paper (Laibe & Price 2011b), we have presented an algorithm for simulating two-fluid gas and dust mixtures in Smoothed Particle Hydrodynamics (SPH). In this paper, we develop an implicit timestepping method that preserves the exact conservation of the both linear and angular momentum in the underlying SPH algorithm, but unlike previous schemes, allows the iterations to converge to arbitrary accuracy and is suited to the treatment of non- linear drag regimes. The algorithm prese...

    Constrained Hyperbolic Divergence Cleaning for Smoothed Particle Magnetohydrodynamics

    Tricco, Terrence S.; Price, Daniel J. (2012)
    Projects: ARC | The role of magnetic fields in star formation (DP1094585)
    We present a constrained formulation of Dedner et al's hyperbolic/parabolic divergence cleaning scheme for enforcing the \nabla\dot B = 0 constraint in Smoothed Particle Magnetohydrodynamics (SPMHD) simulations. The constraint we impose is that energy removed must either be conserved or dissipated, such that the scheme is guaranteed to decrease the overall magnetic energy. This is shown to require use of conjugate numerical operators for evaluating \nabla\dot B and \nabla{\psi} in the SPMHD c...
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