Symplectic algorithm for constant-pressure molecular dynamics using a Nose-Poincare thermostat

Details Symplectic algorithm for constant-pressure molecular dynamics using a Nose-Poincare thermostat Symplectic algorithm for constant-pressure molecular dynamics using a Nose-Poincare thermostat

1999-03-04

arxiv.org/abs/physics/9903009v1

Physics

Chemical Physics

7 pages

Scientific paper

10.1063/1.480502

We present a new algorithm for isothermal-isobaric molecular-dynamics simulation. The method uses an extended Hamiltonian with an Andersen piston combined with the Nos'e-Poincar'e thermostat, recently developed by Bond, Leimkuhler and Laird [J. Comp. Phys., 151, (1999)]. This Nos'e-Poincar'e-Andersen (NPA) formulation has advantages over the Nos'e-Hoover-Andersen approach in that the NPA is Hamiltonian and can take advantage of symplectic integration schemes, which lead to enhanced stability for long-time simulations. The equations of motion are integrated using a Generalized Leapfrog Algorithm and the method is easy to implement, symplectic, explicit and time reversible. To demonstrate the stability of the method we show results for test simulations using a model for aluminum.

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