Rheology via Nonequilibrium Molecular Dynamics [1]

  • William G. Hoover
Conference paper
Part of the Lecture Notes in Engineering book series (LNENG, volume 3)

Abstract

The equilibrium molecular dynamics formulated by Newton, Lagrange, and Hamilton has been modified in order to simulate rheological molecular flows with fast computers. This modified “Nonequilibrium Molecular Dynamics” (NEMD) has been applied to fluid and solid deformations, under both homogeneous and shock conditions, as well as to the transport of heat. The irreversible heating associated with dissipation could be controlled by carrying out isothermal NEMD calculations. The new isothermal NEMD equations of motion are consistent with Gauss’ 1829 “Least- Constraint” principle as well as certain microscopic equilibrium and nonequilibrium statistical formulations due to Gibbs and Boltzmann. Application of isothermal NEMD revealed high-frequency and high-strain- rate behavior for simple fluids which resembled the behavior of polymer solutions and melts at lower frequencies and strain rates. For solids NEMD produces plastic flows consistent with experimental observations at much lower strain rates. The new nonequilibrium methods also suggest novel formulations of thermodynamics in nonequilibrium systems and shed light on the failure of the “Principle of Material Frame Indifference.”

Keywords

Argon Peri Librium Boulder Butane 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1983

Authors and Affiliations

  • William G. Hoover
    • 1
  1. 1.Department of Applied ScienceUniversity of California at Davis/Livermore and Lawrence Livermore National LaboratoryLivermoreUSA

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