Simflowny 2: An upgraded platform for scientific modelling and simulation

Arbona, A.; Miñano, Borja; A., Rigo,; Bona, Carles; Palenzuela, Carlos; Artigues, Antoni; Bona-Casas, Carles; Massó, Joan

doi:10.1016/j.cpc.2018.03.015

Cited by 32 publications

(37 citation statements)

References 13 publications

(11 reference statements)

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“…The code presented here has been generated by using Simflowny 66,67 to run under the SAMRAI infrastructure, 68,69 which provides efficient parallelization and adaptive mesh refinement (not used in this work).…”

Section: A Platform and Numerical Schemesmentioning

confidence: 99%

Extension of the subgrid-scale gradient model for compressible magnetohydrodynamics turbulent instabilities

2019

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Performing accurate large eddy simulations in compressible, turbulent magnetohydrodynamics is more challenging than in non-magnetized fluids due to the complex interplay between kinetic, magnetic and internal energy at different scales. Here we extend the sub-grid-scale gradient model, so far used in the momentum and induction equations, to account also for the unresolved scales in the energy evolution equation of a compressible ideal MHD fluid with a generic equation of state. We assess the model by considering box simulations of the turbulence triggered across a shear layer by the Kelvin-Helmholtz instability, testing cases where the small-scale dynamics cannot be fully captured by the resolution considered, such that the efficiency of the simulated dynamo effect depends on the resolution employed. This lack of numerical convergence is actually a currently common issue in several astrophysical problems, where the integral and fastest-growing-instability scales are too far apart to be fully covered numerically. We perform a-priori and a-posteriori tests of the extended gradient model. In the former, we find that, for many different initial conditions and resolutions, the gradient model outperforms other commonly used models in terms of correlation with the residuals coming from the filtering of a high-resolution run. In the second test, we show how a low-resolution run with the gradient model is able to quantitatively reproduce the evolution of the magnetic energy (the integrated value and the spectral distribution) coming from higher-resolution runs. This extension is the first step towards the implementation in relativistic magnetohydrodynamics.

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Section: A Platform and Numerical Schemesmentioning

confidence: 99%

Extension of the subgrid-scale gradient model for compressible magnetohydrodynamics turbulent instabilities

2019

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“…These equations have been introduced in the platform Simflowny [35][36][37][38] to automatically generate parallel code for the SAMRAI infrastructure [39][40][41]. SAM-RAI provides parallelization and Adaptive Mesh Refinement (AMR), which are crucial to obtain accurate solutions in an efficient manner by adding more resolution only where it is required (i.e., in the regions encompassing each BSs).…”

Section: B Numerical Implementationmentioning

confidence: 99%

Gravitational waves from dark boson star binary mergers

Bezares

Palenzuela

2018

Class. Quantum Grav.

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Gravitational wave astronomy might allow us to detect the coalescence of low-brightness astrophysical compact objects which are extremely difficult to be observed with current electromagnetic telescopes. Besides classical sources like black holes and neutron stars, other candidates include Exotic Compact Objects (ECOs), which could exist in theory but have never yet been observed in Nature. Among different possibilities, here we consider Dark Stars, astrophysical compact objects made of dark matter such that only interact with other stars through gravity. We study numerically the dynamics and the gravitational waves produced during the binary coalescence of Dark Stars composed by bosonic fields. These results are compared both with Post-Newtonian approximations and with previous simulations of binary boson stars, which interact both through gravity and matter. Our analysis indicates that Dark Boson Stars belong to a new kind of compact objects, representing stars made with different species, whose merger produces a gravitational signature clearly distinguishable from other astrophysical objects like black holes, neutron stars and even boson stars.

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“…In our context, such a strategy has only been explored preliminarily in the 3D Cartesian parallelized code used in Viganò et al (2019). This code was built by using Simflowny (Arbona et al 2013(Arbona et al , 2018, a versatile platform able to automatically generate parallelized codes for partial differential equations. It employs the adaptive mesh refinement libraries of SAMRAI (Hornung and Kohn 2002), and a graphical user interface that easily allows us to implement equations and to choose among different time and space discretization schemes.…”

Section: Extended Domainsmentioning

confidence: 99%

Magnetic, thermal and rotational evolution of isolated neutron stars

Pons

Viganò

2019

Living Rev Comput Astrophys

106

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The strong magnetic field of neutron stars is intimately coupled to the observed temperature and spectral properties, as well as to the observed timing properties (distribution of spin periods and period derivatives). Thus, a proper theoretical and numerical study of the magnetic field evolution equations, supplemented with detailed calculations of microphysical properties (heat and electrical conductivity, neutrino emission rates) is crucial to understand how the strength and topology of the magnetic field vary as a function of age, which in turn is the key to decipher the physical processes behind the varied neutron star phenomenology. In this review, we go through the basic theory describing the magneto-thermal evolution models of neutron stars, focusing on numerical techniques, and providing a battery of benchmark tests to be used as a reference for present and future code developments. We summarize well-known results from axisymmetric cases, give a new look at the latest 3D advances, and present an overview of the expectations for the field in the coming years.

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Simflowny 2: An upgraded platform for scientific modelling and simulation

Cited by 32 publications

References 13 publications

Extension of the subgrid-scale gradient model for compressible magnetohydrodynamics turbulent instabilities

Extension of the subgrid-scale gradient model for compressible magnetohydrodynamics turbulent instabilities

Gravitational waves from dark boson star binary mergers

Magnetic, thermal and rotational evolution of isolated neutron stars

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