On the freestream preservation of high-order conservative flux-reconstruction schemes

Yoshiaki Abe, Takanori Haga, Taku Nonomura, Kozo Fujii

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The appropriate procedure for constructing the symmetric conservative metric is presented with which both the freestream preservation and global conservation properties are satisfied in the high-order conservative flux-reconstruction scheme on a three-dimensional stationary-curvilinear grid. A freestream preservation test is conducted, and the symmetric conservative metric constructed by the appropriate procedure preserves the freestream regardless of the order of shape functions, while other metrics cannot always preserve the freestream. Also a convecting vortex is computed on three-dimensional wavy grids, and the formal order of accuracy is achieved when the symmetric conservative metric is appropriately constructed, while it is not when they are inappropriately constructed. In addition, although the sufficient condition for the freestream preservation with the nonconservative (cross product form) metric was reported in the previous study to be that the order of solution polynomial has to be greater than or equal to the twice of the order of a shape function, a special case is newly found in the present study: when the Radau polynomial is used for the correction function, the freestream is preserved even if the solution order is lower than the known condition. Using the properties of Legendre polynomials, the mechanism for this special case is analytically explained, considering the cancellation of aliasing errors.

Original languageEnglish
Pages (from-to)28-54
Number of pages27
JournalJournal of Computational Physics
Volume281
DOIs
Publication statusPublished - 2015 Jan 5

Keywords

  • Aliasing error
  • Conservative metric
  • Flux-reconstruction scheme
  • Freestream preservation
  • Geometric conservation law
  • High-order unstructured scheme

ASJC Scopus subject areas

  • Numerical Analysis
  • Modelling and Simulation
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

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