edu.ucar.opensky::articles:17382 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:16:55.996636 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7gm88m3 A comparison of spectral element and finite difference methods using statically refined nonconforming grids for the MHD island coalescence instability problem 2008-08-01T00:00:00Z publication https://n2t.org/ark:/85065/d7gm88m3 https://doi.org/10.1086/588139 Ng, C. author Rosenberg, Duane L. author Germaschewski, K. author Pouquet, Annick author Bhattacharjee, A. author UCAR/NCAR - Library publisher A recently developed spectral-element adaptive refinement incompressible magnetohydrodynamic (MHD) code is applied to simulate the problem of MHD island coalescence instability (MICI) in two dimensions. MICI is a fundamental MHD process that can produce sharp current layers and subsequent reconnection and heating in a high-Lundquist number plasma such as the solar corona. Because of the formation of thin current layers, it is highly desirable to use adaptively or statically refined grids to resolve them and to maintain accuracy at the same time. The output of the spectral-element static adaptive refinement simulations are compared with simulations using a finite-difference method on the same refinement grids, and both methods are compared to pseudospectral simulations with uniform grids as baselines. It is shown that with the statically refined grids roughly scaling linearly with effective resolution, spectral element runs can maintain accuracy significantly higher than that of the finite-difference runs, in some cases achieving close to full spectral accuracy. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2008. The American Astronomical Society. All rights reserved. Printed in the U.S. None eng geoscientificInformation