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FIZIKA A 14 (2005) 2, 179 - 186
 
SHEAR STRESS CORRELATION LENGTH AT CONSTANT PRESSURE
JANKA PETRAVIĆ
Research School of Chemistry, The Australian National University,
Canberra ACT 0200, Australia
Present address: School of Chemistry, The University of Sydney, NSW
2006, Australia
E-mail address: janka@chem.usyd.edu.au
Received 15 March 2005; revised manuscript received 12 May 2005
Accepted 13 June 2005 Online 7 December 2005
Even in simple liquids, shear stress relaxation is a cooperative effect associated with
a correlation length. For subsystems of a size smaller than the correlation length, shear
stress is determined by the strain at the boundaries. We show that the shear stress
correlation length increases with the isobaric decrease in temperature, and quantify this
decrease using molecular dynamics simulations of a simple atomic liquid with short-range
repulsive interactions in the isothermal-isobaric ensemble with strained periodic boundary
conditions.
PACS numbers: 61.20.-p, 66.20.+d, 02.70.Ns
UDC 531.383
Keywords: shear stress relaxation, number effects, boundary conditions
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