From continuum mechanics to SPH particle systems and back: Systematic derivation and convergence

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

Abstract

In this paper, we derive from the principle of least action the equation of motion for a continuous medium with regularized density field in the context of measures. The eventual equation of motion depends on the order in which regularization and the principle of least action are applied. We obtain two different equations, whose discrete counterparts coincide with the scheme used traditionally in the Smoothed Particle Hydrodynamics (SPH) numerical method [27], and with the equation treated by Di Lisio et al. in [9], respectively. Additionally, we prove the convergence in the Wasserstein distance of the corresponding measure‐valued evolutions, moreover providing the order of convergence of the SPH method. The convergence holds for a general class of force fields, including external and internal conservative forces, friction and non‐local interactions. The proof of convergence is illustrated numerically by means of one and two‐dimensional examples.

Details

Original languageEnglish
Pages (from-to)106-133
Number of pages28
JournalZAMM Zeitschrift fur Angewandte Mathematik und Mechanik
Volume98
Issue number1
Early online date14 Aug 2017
Publication statusPublished - Jan 2018

Keywords

  • Smoothed Particle Hydrodynamics, Principle of least action, Wasserstein distance, Measure‐valued equations, Convergence rate, 70H25, 28A33, 65M12, 35Q70, 46E27, 70Fxx, 76M25