Attempt to Suppress Numerical Viscosity in Incompressible SPH Method

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FUKUNISHI Y.; TAKAHASHI Y.; Nishio y.; IZAWA S.

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Journal Paper

Paper Information

Journal: JOURNAL OF APPLIED FLUID MECHANICS (JAFM) Year:2019 | Volume:12 | Issue:4 Page(s): 1231-1240

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Title

Attempt to Suppress Numerical Viscosity in Incompressible SPH Method

Author(s)

FUKUNISHI Y. | TAKAHASHI Y. | Nishio y. | IZAWA S. | Issue Writer Certificate

Keywords

Incompressible SPH computation

Numerical viscosity

Wall friction

Elliptic kernel function

Special wall treatment

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.

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APA: Copy

FUKUNISHI, Y., TAKAHASHI, Y., Nishio, y., & IZAWA, S.. (2019). Attempt to Suppress Numerical Viscosity in Incompressible SPH Method. JOURNAL OF APPLIED FLUID MECHANICS (JAFM), 12(4), 1231-1240. SID. https://sid.ir/paper/307968/en

Vancouver: Copy

FUKUNISHI Y., TAKAHASHI Y., Nishio y., IZAWA S.. Attempt to Suppress Numerical Viscosity in Incompressible SPH Method. JOURNAL OF APPLIED FLUID MECHANICS (JAFM)[Internet]. 2019;12(4):1231-1240. Available from: https://sid.ir/paper/307968/en

IEEE: Copy

Y. FUKUNISHI, Y. TAKAHASHI, y. Nishio, and S. IZAWA, “Attempt to Suppress Numerical Viscosity in Incompressible SPH Method,” JOURNAL OF APPLIED FLUID MECHANICS (JAFM), vol. 12, no. 4, pp. 1231–1240, 2019, [Online]. Available: https://sid.ir/paper/307968/en

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