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Entropy-limited hydrodynamics: a novel approach to relativistic hydrodynamics

GUERCILENA, Federico - Personal Name
RADICE, David - Personal Name
REZZOLLA, Luciano - Personal Name

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 hybridisation of an unfiltered high-order scheme with the first-order Lax-Friedrichs method. The activation of the low-order part of the scheme is driven by a measure of the locally generated entropy inspired by the artificial-viscosity method proposed by Guermond et al. (J. Comput. Phys. 230(11):4248-4267, 2011, doi:10.1016/j.jcp.2010.11.043). Here, we present ELH in the context of high-order finite-differencing methods and of the equations of general-relativistic hydrodynamics. We study the performance of ELH in a series of classical astrophysical tests in general relativity involving isolated, rotating and nonrotating neutron stars, and including a case of gravitational collapse to black hole. We present a detailed comparison of ELH with the fifth-order monotonicity preserving method MP5 (Suresh and Huynh in J. Comput. Phys. 136(1):83-99, 1997, doi:10.1006/jcph.1997.5745), one of the most common high-order schemes currently employed in numerical-relativity simulations. We find that ELH achieves comparable and, in many of the cases studied here,
better accuracy than more traditional methods at a fraction of the computational cost (up to ∼50% speedup). Given its accuracy and its simplicity of implementation, ELH is a promising framework for the development of new special-and general-relativistic hydrodynamics codes well adapted for massively parallel supercomputers.

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flux limiters
entropy limited hydrodynamics
numerical methods
central schemes

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Federico Guercilena, David Radice, Luciano Rezzolla

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NPP. 3509212D1000001

Entropy-limited hydrodynamics: a novel approach to relativistic hydrodynamics

GUERCILENA, Federico - Personal NameRADICE, David - Personal NameREZZOLLA, Luciano - Personal Name

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GUERCILENA, Federico - Personal Name
RADICE, David - Personal Name
REZZOLLA, Luciano - Personal Name