English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a carefully designed, systematic study of the angular resolutiondependence of simulations with the Prometheus-Vertex neutrino-hydrodynamicscode. Employing a simplified neutrino heating-cooling scheme in the Prometheushydrodynamics module allows us to sample the angular resolution between 4degrees and 0.5 degrees. With a newly-implemented static mesh refinement (SMR)technique on the Yin-Yang grid, the angular coordinates can be refined inconcentric shells, compensating for the diverging structure of the sphericalgrid. In contrast to previous studies with Prometheus and other codes, we findthat higher angular resolution and therefore lower numerical viscosity providesmore favorable explosion conditions and faster shock expansion. We discuss thepossible reasons for the discrepant results. The overall dynamics seem toconverge at a resolution of about 1 degree. Applying the SMR setup tomarginally exploding progenitors is disadvantageous for the shock expansion,however, because kinetic energy of downflows is dissipated to internal energyat resolution interfaces, leading to a loss of turbulent pressure support and asteeper temperature gradient. We also present a way to estimate the numericalviscosity on grounds of the measured turbulent kinetic-energy spectrum, leadingto smaller values that are better compatible with the flow behavior witnessedin our simulations than results following calculations in previous literature.Interestingly, the numerical Reynolds numbers in the turbulent, neutrino-heatedpostshock layer (some 10 to several 100) are in the ballpark of expectedneutrino-drag effects on the relevant length scales in the turbulent postshocklayer. We provide a formal derivation and quantitative assessment of theneutrino drag terms in an appendix.

Resolution Study for Three-dimensional Supernova Simulations with the Prometheus-Vertex Code