title: Comment on "Computation of the viscosity of a liquid from time averages of stress fluctuations".
abstract: In a recent paper, Hess and Evans [Phys. Rev. E 64, 011207 (2001)] propose a method different from the conventional Green-Kubo and Einstein methods to calculate viscosity in equilibrium molecular dynamics simulations. For a comparison, we calculate the shear viscosity of SPC/E water at 303 K using these three different methods. We find that the Hess-Evans method is not as good as the other two in practical application, especially for the fluids with high viscosity and complicated relaxation.
authors.affiliation: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, People's Republic of China. guogj@mail.igcas.ac.cn
authors.forename: Guang-Jun
authors.initials: GJ
authors.lastname: Guo
authors.forename: Yi-Gang
authors.initials: YG
authors.lastname: Zhang
authors.forename: Ya-Juan
authors.initials: YJ
authors.lastname: Zhao