Attempt to Suppress Numerical Viscosity in Incompressible SPH Method

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 redu...

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Bibliographic Details
Published in:Journal of Applied Fluid Mechanics 2019-07, Vol.12 (4), p.1231-1240
Main Authors: Fukunishi, Y., Takahashi, Y., Nishio, Y., Izawa, S.
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Elliptic kernel function
Fluid flow
Hydrodynamics
Incompressible SPH computation
Kernel functions
Numerical viscosity
Smooth particle hydrodynamics
Special wall treatment
Viscosity
Wall friction
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Summary: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.
ISSN:1735-3572
1735-3645
DOI:10.29252/jafm.12.04.29633