High-order central ENO finite-volume scheme for ideal MHD

A. Susanto, L. Ivan, H. De Sterck, C. P T Groth

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29 Citations (Scopus)

Abstract

A high-order accurate finite-volume scheme for the compressible ideal magnetohydrodynamics (MHD) equations is proposed. The high-order MHD scheme is based on a central essentially non-oscillatory (CENO) method combined with the generalized Lagrange multiplier divergence cleaning method for MHD. The CENO method uses k-exact multidimensional reconstruction together with a monotonicity procedure that switches from a high-order reconstruction to a limited low-order reconstruction in regions of discontinuous or under-resolved solution content. Both reconstructions are performed on central stencils, and the switching procedure is based on a smoothness indicator. The proposed high-order accurate MHD scheme can be used on general polygonal grids. A highly sophisticated parallel implementation of the scheme is described that is fourth-order accurate on two-dimensional dynamically-adaptive body-fitted structured grids. The hierarchical multi-block body-fitted grid permits grid lines to conform to curved boundaries. High-order accuracy is maintained at curved domain boundaries by employing high-order spline representations and constraints at the Gauss quadrature points for flux integration. Detailed numerical results demonstrate high-order convergence for smooth flows and robustness against oscillations for problems with shocks. A new MHD extension of the well-known Shu-Osher test problem is proposed to test the ability of the high-order MHD scheme to resolve small-scale flow features in the presence of shocks. The dynamic mesh adaptation capabilities of the approach are demonstrated using adaptive time-dependent simulations of the Orszag-Tang vortex problem with high-order accuracy and unprecedented effective resolution.

Original languageEnglish
Pages (from-to)141-164
Number of pages24
JournalJournal of Computational Physics
Volume250
DOIs
Publication statusPublished - 1 Oct 2013
Externally publishedYes

Keywords

  • Adaptive mesh refinement (AMR)
  • Body-fitted grids
  • Central ENO (CENO)
  • Divergence cleaning for MHD
  • Essentially non-oscillatory (ENO)
  • Generalized Lagrange multiplier (GLM)
  • High-order schemes
  • Magnetohydrodynamics (MHD)

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