Development of an improved spatial reconstruction technique for the HLL method and its applications

Matthew R. Smith, K. M. Lin, C. T. Hung, Y. S. Chen, Jong-Shinn Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The integral form of the conventional HLL fluxes are presented by taking integrals around the control volume centred on each cell interface. These integrals are demonstrated to reduce to the conventional HLL flux through simplification by assuming spatially constant conserved properties. The integral flux expressions are then modified by permitting the analytical inclusion of spatially linearly varying conserved quantities. The newly obtained fluxes (which are named HLLG fluxes for clarification, where G stands for gradient inclusion) demonstrate that conventional reconstructions at cell interfaces are invalid and can produce unstable results when applied to conventional HLL schemes. The HLLG method is then applied to the solution of the Euler Equations and Shallow Water Equations for various common benchmark problems and finally applied to a 1D fluid modeling for an argon RF discharge at low pressure. Results show that the correct inclusion of flow gradients is shown to demonstrate superior transient behavior when compared to the existing HLL solver and conventional spatial reconstruction without significantly increasing computational expense.

Original languageEnglish
Pages (from-to)477-493
Number of pages17
JournalJournal of Computational Physics
Issue number3
StatePublished - 1 Feb 2011


  • Computational fluid dynamics (CFD)
  • Finite volume methods (FVM)
  • Plasma simulation
  • Total variable diminishing (TVD) schemes


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