Journal
ENTROPY
Volume 15, Issue 8, Pages 3249-3264Publisher
MDPI
DOI: 10.3390/e15083339
Keywords
molecular-dynamicssimulations; long-rangeinteractions; liquidwater; electrostaticinteractions; reactionfield
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Funding
- Japan Society for the Promotion of Science (JSPS) [25820065]
- Grants-in-Aid for Scientific Research [25820065] Funding Source: KAKEN
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A reduction of the cost for long-range interaction calculation is essential for large-scale molecular systems that contain a lot of point charges.Cutoff methods are often used to reduce the cost of long-range interaction calculations. Molecular dynamics (MD) simulations can be accelerated by using cut off methods; however, simple truncation or approximation of long-range interactions often offers serious defects for various systems. For example, thermodynamical properties of polar molecular systems are strongly affected by the treatment of the Coulombic interactions and may lead to unphysical results. To assess the truncation effect of some cutoff methods that are categorized as the shift function method, MD simulations for bulk water systems were performed. The results reflect two main factors, i.e., the treatment of cutoff boundary conditions and the presence/absence of the theoretical background for the long-range approximation.
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