A geometrically-conservative, synchronized, flux-corrected remap for arbitrary Lagrangian-Eulerian computations with nodal finite elements

  • Authors:

  • A. LóPez Ortega;G. Scovazzi

  • Affiliations:

  • Graduate Aerospace Laboratories, California Institute of Technology, MC 105-50, Pasadena, CA 91125, USA;1431 Computational Shock- and Multi-Physics Department, Sandia National Laboratories, P.O. Box 5800, MS 1319, Albuquerque, NM 87185-1319, USA

  • Venue:
  • Journal of Computational Physics
  • Year:
  • 2011

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Abstract

This article describes a conservative synchronized remap algorithm applicable to arbitrary Lagrangian-Eulerian computations with nodal finite elements. In the proposed approach, ideas derived from flux-corrected transport (FCT) methods are extended to conservative remap. Unique to the proposed method is the direct incorporation of the geometric conservation law (GCL) in the resulting numerical scheme. It is shown here that the geometric conservation law allows the method to inherit the positivity preserving and local extrema diminishing (LED) properties typical of FCT schemes. The proposed framework is extended to the systems of equations that typically arise in meteorological and compressible flow computations. The proposed algorithm remaps the vector fields associated with these problems by means of a synchronized strategy. The present paper also complements and extends the work of the second author on nodal-based methods for shock hydrodynamics, delivering a fully integrated suite of Lagrangian/remap algorithms for computations of compressible materials under extreme load conditions. Extensive testing in one, two, and three dimensions shows that the method is robust and accurate under typical computational scenarios.