{
  "abstract": "Ideal-GRMHD calculations provide the bulk accretion flows used in black hole emission models. A localized dissipation prescription can add a resolved map of current-sheet activity while retaining that dynamical reference. We implement such a prescription in Athena++ , using a smooth threshold on the dimensionless current proxy α J to select the magnetic-diffusion coefficient. The constrained-transport update is coupled to a conservative energy-flux correction. Gas heating follows from primitive recovery; q Ohm = ηJ ² is recorded as a diagnostic, without a second energy source. Static Fourier and traveling Alfvén tests measure the evolved thermal gain, and an open-boundary Schwarzschild test closes the Killing-energy ledger. The relative total-energy residual is below 2 × 10 ⁻¹⁵ in these tests. A two-resolution Harris matrix gives localized rate exponents 0.510 ± 0.027 and 0.488 ± 0.028, consistent with 1/2 over the specified early interval. The η = 10 ⁻³ rate exceeds the same-resolution ideal control by a factor of 5.96. In matched axisymmetric M87-like runs, localized diffusion changes the early mean magnetic flux, accretion rate, and normalized flux by less than 0.02%, with a radial-density distance of 0.005%. During the late active phase, a common-restart on/off comparison keeps these mean shifts below 1.6%, within the intrinsic temporal variability, and gives a density distance of 0.29%. Uniform diffusion at the tested coefficient reduces the raw flux and accretion rate by 85% and 99.8%. These comparisons establish a spatially selective diffusion prescription with explicit energy accounting and a quantified, small bulk-flow response.",
  "abstract_shown": true,
  "affiliations": [
    "Zhejiang University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Songyan Dai",
      "orcid": "0009-0000-1059-7785"
    },
    {
      "affs": [
        0
      ],
      "name": "Renyue Cen",
      "orcid": "0000-0001-8531-9536"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8tmgpezfrswtw.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea6c7",
  "fulltext_url": null,
  "id": "8tmgpezfrswtw",
  "issns": [
    "1538-4357",
    "0004-637X"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6c7",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "astronomy/general"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6c7/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/8tmgpezfrswtw.ris",
  "sources": [
    {
      "first_seen": "2026-11-02T12:20:42Z",
      "native_id": "10.3847/1538-4357/aea6c7",
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      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6c7"
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    {
      "first_seen": "2026-11-02T12:21:56Z",
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      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6c7"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "A Localized Current-sheet Magnetic-diffusion and Heating Prescription for Ideal-GRMHD Simulations of M87*-like Accretion Flows",
  "title_text": "A Localized Current-sheet Magnetic-diffusion and Heating Prescription for Ideal-GRMHD Simulations of M87*-like Accretion Flows",
  "type": "peer-reviewed",
  "updated_at": "2026-11-04T00:22:41Z",
  "url": "https://research.draconitic.com/paper/8tmgpezfrswtw",
  "venue": "The Astrophysical Journal",
  "versions": []
}