Higher-level large-eddy filtering strategy for general relativistic fluid simulations
Abstract
Nonlinear simulations of neutron star mergers are complicated by the need to represent turbulent dynamics. As we cannot (yet) perform simulations that resolve accurately both the gravitational-wave scale and the smallest scales at which magneto/hydrodynamic turbulence plays a role, we need to rely on approximations. Addressing this problem in the context of large-eddy models, we outline a coherent Lagrangian filtering framework that allows us to explore the many issues that arise, linking conceptual problems to practical implementations and the interpretation of the results. We develop understanding crucial for quantifying unavoidable uncertainties in current and future numerical relativity simulations and consider the implications for neutron-star parameter estimation and constraints on the equation of state of matter under extreme conditions.
Cite
@article{arxiv.2407.18012,
title = {Higher-level large-eddy filtering strategy for general relativistic fluid simulations},
author = {Thomas Celora and Nils Andersson and Ian Hawke and Greg L. Comer and Marcus J. Hatton},
journal= {arXiv preprint arXiv:2407.18012},
year = {2025}
}
Comments
15 pages, as published in Phys. Rev. D