Hydrodynamic Lubrication

Abstract

a b s t r a c tThis paper presents a conservative numerical implementation of a new cavitation model that is well suited for lubrication problems with cavitated regions in which the fluid film is attached to just one of the participating surfaces, as happens for instance in piston-ring assemblies. This new model was recently proposed by Buscaglia et al. (2011) and is the first successful attempt at modifying the ElrodAdams model considering a physically realistic value for the lubricant transport velocity in the incomplete-film region in those cases. In this work we show first the reasons for previous attempts to have failed, which come from a loss of uniqueness of the associated exact mathematical problem. Then, the new model is briefly recalled and a one dimensional numerical implementation by means of a finite volume scheme is presented together with several test-case results.

Benchmarking of two flexible multibody dynamic simulation software in engine simulations

“…Based on the theory of the hydrodynamic and Reynolds equations, this hydrodynamic pressure results in low friction and theoretically zero wear. [25] In both software, the Reynolds equation determines the hydrodynamic behavior of the oil film on the bearing surfaces. Usually, the most important results over time are oil film thickness and pressure distribution in the oil between sliding surfaces.…”