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Spurious interface fragmentation in multiphase SPH
Author(s) -
Szewc K.,
Pozorski J.,
Minier J.P.
Publication year - 2015
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.4904
Subject(s) - spurious relationship , surface tension , interface (matter) , mechanics , smoothed particle hydrodynamics , multiphase flow , smoothing , computer science , current (fluid) , statistical physics , physics , thermodynamics , gibbs isotherm , machine learning , computer vision
Summary We investigate the issue of sub‐kernel spurious interface fragmentation occurring in SPH applied for multiphase flows. It has appeared recently that current SPH formulations for multiphase flows involving an interface between immiscible phases can suffer from non‐physical particle mixing through the interface, especially for flows with high density ratios. This is an important issue, in particular for applications where physical phenomena take place at the interface itself, such as phase change or the evolution of two‐phase flow patterns. In this paper, various remedies proposed in the literature are discussed. The current assumption that spurious interface fragmentation occurs only when there is no surface tension at the interface is revisited. We show that this is a general problem of current SPH formulations that appears even when surface tension is present. A new proposition for an interface sharpness correction term is put forward. A series of simulations of two‐dimensional and three‐dimensional bubbles rising in a liquid allow a comprehensive study and demonstrate the dependence of the new correction term on the kernel smoothing length. On the other hand, the overall flow behavior, including the interface shape, is not affected. Copyright © 2015 John Wiley & Sons, Ltd.