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Constant-temperature molecular-dynamics algorithms for mixed hard-core/continuous potentials | Yao A. Houndonougbo
; Brian B. Laird
; | Date: |
9 Apr 2002 | Subject: | Chemical Physics; Fluid Dynamics | physics.chem-ph physics.flu-dyn | Affiliation: | Department of Chemistry, University of Kansas, Lawrence, KS, USA | Abstract: | We present a set of second-order, time-reversible algorithms for the isothermal (NVT) molecular-dynamics (MD) simulation of systems with mixed hard-core/continuous potentials. The methods are generated by combining real-time Nose’ thermostats with our previously developed Collision Verlet algorithm [Mol. Phys. 98, 309 (1999)] for constant energy MD simulation of such systems. In all we present 5 methods, one based on the Nose’-Hoover [Phys. Rev. A 31, 1695 (1985)] equations of motion and four based on the Nose’-Poincare’ [J.Comp.Phys., 151 114 (1999)] real-time formulation of Nose’ dynamics. The methods are tested using a system of hard spheres with attractive tails and all correctly reproduce a canonical distribution of instantaneous temperature. The Nose’-Hoover based method and two of the Nose’-Poincare’ methods are shown to have good energy conservation in long simulations. | Source: | arXiv, physics/0204028 | Services: | Forum | Review | PDF | Favorites |
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