Pressure Profile Calculation with Mesh Ewald Methods

Marcello Sega, Balázs Fábián, P. Jedlovszky

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The importance of calculating pressure profiles across liquid interfaces is increasingly gaining recognition, and efficient methods for the calculation of long-range contributions are fundamental in addressing systems with a large number of charges. Here, we show how to compute the local pressure contribution for mesh-based Ewald methods, retaining the typical N log N scaling as a function of the lattice nodes N. This is a considerable improvement on existing methods, which include approximating the electrostatic contribution using a large cutoff and the, much slower, Ewald calculation. As an application, we calculate the contribution to the pressure profile across the water/vapor interface, coming from different molecular layers, both including and removing the effect of thermal capillary waves. We compare the total pressure profile with the one obtained using the cutoff approximation for the calculation of the stresses, showing that the stress distributions obtained using the Harasima and Irving-Kirkwood path are quite similar and shifted with respect to each other at most 0.05 nm.

Original languageEnglish
Pages (from-to)4509-4515
Number of pages7
JournalJournal of Chemical Theory and Computation
Volume12
Issue number9
DOIs
Publication statusPublished - Sep 13 2016

ASJC Scopus subject areas

  • Computer Science Applications
  • Physical and Theoretical Chemistry

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