Attempt to Suppress Numerical Viscosity in Incompressible SPH Method

Y. Fukunishi, Y. Takahashi, Y. Nishio, S. Izawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, attempts to suppress numerical viscosity in incompressible smoothed particle hydrodynamics (SPH) computations are reported. Two-dimensional computations are performed for inviscid and viscous flows to evaluate the effects of numerical viscosity suppression. The first approach is to reduce numerical viscosity at the wall by considering only the wall-normal components of the forces between fluid particles and wall particles. The second approach is to reduce numerical viscosity within the flow field by employing elliptic kernel functions whose major axes are aligned with the local mean flow direction. It is found that special treatment of the wall radically reduces the numerical wall friction. Using an elliptic kernel function is found to work reasonably well in reducing numerical viscosity.

Original languageEnglish
Pages (from-to)1231-1240
Number of pages10
JournalJournal of Applied Fluid Mechanics
Volume12
Issue number4
DOIs
Publication statusPublished - 2019

Keywords

  • Incompressible SPH computation, Numerical viscosity, Wall friction, Elliptic kernel function, Special wall treatment

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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