Journal
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
Volume 143, Issue 12, Pages -Publisher
ASME
DOI: 10.1115/1.4050272
Keywords
contact; contact mechanics; elastohydrodynamic lubrication; fluid film lubrication; rolling friction
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Funding
- VLAIO (Agency for Innovation by Science and Technology in Flanders) [160228]
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The study compared the performance of different methods under various elastohydrodynamic lubrication conditions, quantifying their differences to understand the advantages and limitations of each.
When simulating elastohydrodynamic lubrication, two main approaches are usually followed to predict the pressure and fluid film thickness distribution throughout the contact. The conventional approach relies on the Reynolds equation to describe the thin lubricant film, which is coupled to a Boussinesq description of the linear elastic deformation of the solids. A more accurate, yet a time-consuming method is the use of computational fluid dynamics in which the Navier-Stokes equations describe the flow of the thin lubricant film, coupled to a finite element solver for the description of the local contact deformation. This investigation aims at assessing both methods for different lubrication conditions in different elastohydrodynamic lubrication (EHL) regimes and quantify their differences to understand advantages and limitations of both methods. This investigation shows how the results from both approaches deviate for three scenarios: (1) inertial contributions (Re > 1), i.e., thick films, high speed, and low viscosity; (2) high shear stresses leading to secondary flows; and (3) large deformations of the solids leading to inaccuracies of the Boussinesq equation.
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