Improving divergence cleaning in cosmological SPMHD simulations

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ID: 317434
2026
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Abstract
Abstract We implement the constrained hyperbolic/parabolic divergence cleaning algorithm into the cosmological smoothed particle magnetohydrodynamics (SPMHD) code OpenGadget3, modifying the governing equations so that the scheme can be applied consistently in an expanding cosmological framework. This ensures that divergence errors in the magnetic field are actively propagated away and damped, rather than advected with the flow and partially controlled by source terms as in the previously employed Powell eight-wave approach. We validate the implementation on a series of standard test problems — the advection of an artificial divergence pulse, the Orszag–Tang vortex, the Brio–Wu shock tube, and a magnetised Zeldovich pancake — which confirm that the scheme reduces divergence errors while preserving the correct physical evolution. We then apply the method to a fully cosmological simulation of a massive galaxy cluster with M200c ≈ 1015 M⊙, and compare directly to the Powell-only approach. The overall density structure of the cluster is largely unchanged by the choice of divergence cleaning, and the magnetic field geometry and strength in the cluster core remain similar. In the cluster outskirts (r ≈ 1–3 h−1 Mpc), however, the magnetic field is amplified by a factor of 5–10 compared to the Powell-only run, while the divergence error is reduced by 2–3 orders of magnitude throughout the cluster volume. Our results suggest that accurate divergence control is essential for capturing magnetic field amplification in the low-density, poorly resolved outskirts of galaxy clusters.
Reference Key
openalex_W4416766036 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ulrich P. Steinwandel, Daniel J. Price
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1121
URL
https://doi.org/10.1093/mnras/stag1121
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