Effects of differential scheme and viscosity model on rough-surface point-contact isothermal EHL

Yuchuan Liu*, Q Jane Wang, Dong Zhu, Wenzhong Wang, Yuanzhong Hu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


This paper discussed the computational accuracy of roughsurface point-contact isothermal elastohydrodynamic lubrication (EHL) analysis by investigating the effects of differential scheme, viscosity-pressure, and shear-thinning models. An EHL experiment with multitransverse ridges was employed as simulated target. Four differential schemes, including the combined and the separate first-order and second-order backward schemes, were investigated. It is found that the separate second-order backward scheme offers the best results based on the comparison with the experimental data, with which two roughness derivatives may be fully or partially canceled each other; thus, the discretization error induced by roughness can be reduced. The consistency of differential schemes is an important issue for the separate schemes. The Yasutomi free-volume viscosity-pressure model and the Eyring rheological model are found to yield the numerical simulations the closest to experimental results.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalJournal of Tribology
Issue number4
StatePublished - Oct 1 2009


  • Differential schemes
  • EHL
  • Rheological models
  • Viscosity-pressure models

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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