Efficient lookup table using a linear function of inverse distance squared
Article first published online: 12 AUG 2013
Copyright © 2013 Wiley Periodicals, Inc.
Journal of Computational Chemistry
Volume 34, Issue 28, pages 2412–2420, 30 October 2013
How to Cite
How to cite this article: J. Comput. Chem. 2013, 34, 2412–2420. DOI: 10.1002/jcc.23404, , .
- Issue published online: 23 SEP 2013
- Article first published online: 12 AUG 2013
- Manuscript Accepted: 18 JUL 2013
- Manuscript Revised: 12 JUL 2013
- Manuscript Received: 2 JUN 2013
- High Performance Computing Infrastructure Strategic Program (MEXT). Grant Number: hp120309
- lookup table;
The major bottleneck in molecular dynamics (MD) simulations of biomolecules exist in the calculation of pairwise nonbonded interactions like Lennard-Jones and long-range electrostatic interactions. Particle-mesh Ewald (PME) method is able to evaluate long-range electrostatic interactions accurately and quickly during MD simulation. However, the evaluation of energy and gradient includes time-consuming inverse square roots and complementary error functions. To avoid such time-consuming operations while keeping accuracy, we propose a new lookup table for short-range interaction in PME by defining energy and gradient as a linear function of inverse distance squared. In our lookup table approach, densities of table points are inversely proportional to squared pair distances, enabling accurate evaluation of energy and gradient at small pair distances. Regardless of the inverse operation here, the new lookup table scheme allows fast pairwise nonbonded calculations owing to efficient usage of cache memory. © 2013 Wiley Periodicals, Inc.