Fluid film lubrication in the presence of cavitation: a mass-conserving two-dimensional formulation for compressible, piezoviscous and non-Newtonian fluids

Bertocchi, Luca; Dini, Daniele; Giacopini, Matteo; Fowell, Mark; Baldini, Andrea

doi:10.1016/j.triboint.2013.05.018

Cited by 77 publications

(105 citation statements)

References 30 publications

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“…The adopted simulation conditions are consistent with the published results from Bertocchi et al [32]. The comparison results involving the hydrodynamic pressure are shown in Fig.…”

Section: Validation and Meshsupporting

confidence: 88%

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Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

Meng

Zhang

2017

Friction

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For the ring/liner conjunction, well-designed surface texturing has been regarded as a potential means to improve its tribological performance, as well as the application of coating. However, so far most researchers focused on the one of these aspects. In this study, the combined effect of coating and texturing on the performance of ring/liner conjunction is numerically investigated. A thermal mixed lubrication model is presented. The effects of the coating's thermal and mechanical properties on the tribological performance are studied under the cold and warm engine operating conditions. Along with the increasing coating thickness, the effects of the coating's thermal properties on friction loss are found to be significant, as well as the effects of the coating's mechanical properties. It is also found that a soft coating with a lower thermal inertia has a greater ability to reduce the friction loss of the textured conjunction.

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“…The adopted simulation conditions are consistent with the published results from Bertocchi et al [32]. The comparison results involving the hydrodynamic pressure are shown in Fig.…”

Section: Validation and Meshsupporting

confidence: 88%

“…4. Only a difference of 0.65% in peak pressure between current model and the one presented by Bertocchi et al [32] is detected. In other words, the result obtained by the present model matches well with the result available in the literature.…”

Section: Validation and Meshcontrasting

confidence: 60%

Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

Meng

Zhang

2017

Friction

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“…This provides a direct solution process that has been found to be very robust and leads to a converged solution within a finite number of computations. The method is also capable of accurately representing pressure distributions with minimal mesh points [26,30,32]. It also avoids the use of additional switching functions used by some other methods to distinguish cavitated and full-film lubricant regions.…”

Section: Complementarity Solution Of Fluid Film Pressures and Cavitationmentioning

confidence: 99%

“…This is particularly true in cases where cavitation and reformation may occur multiple times within the computational domain of interest (e.g. rough contacts [28], textured surfaces [8,10,11,[29][30][31] and dynamically loaded journal bearings [9,16]). …”

Section: Introductionmentioning

confidence: 99%

Transient effects in lubricated textured bearings

Medina

Fowell

Vlădescu

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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The aim of this paper is to study transient phenomena in hydrodynamic textured bearings. Both convergent and convergent-divergent reciprocating textured bearings are considered. A massconserving formulation of the Reynolds equation recently proposed by some of the authors and used to capture cavitation in steady-state lubricated contacts has been implemented to study transient effects in lubricated textured bearings. It is shown that the proposed solver is capable of capturing the frictional response of bearings characterised by various geometries and loading conditions in both steady-state and transient configurations.Depending on the boundary conditions governing the problems under investigation, changes in load support or film thickness variations are correctly predicted, demonstrating that the methodology developed in this paper is suitable to provide an efficient tool for the design and optimisation of textured bearings. A qualitative comparison with preliminary experimental data obtained using an apparatus developed to study reciprocating textured surfaces is performed, showing that the characteristic transient behaviour of such surfaces in different loading regimes can be correctly captured using the proposed numerical implementation. Current limitations of the proposed methodology and possible extensions of the technique to study elasto-hydrodynamic and mixed lubrication regimes are also discussed.

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“…The idea of complementarity was extended by Bertocci et al [21] who formulated a nonlinear complementary problem and by Fan and Behdinan [22] to investigate squeeze film damper problems. Almqvist et al [23] used a different approach in which the pressure-density relationship is not substituted into the Reynolds equation but instead derived by investigating the conservation of mass in both the liquid and vapour phases before considering complementarity.…”

Section: Introductionmentioning

confidence: 99%

An Arbitrary Lagrangian–Eulerian Formulation for Modelling Cavitation in the Elastohydrodynamic Lubrication of Line Contacts

Boer

Dowson

2018

Lubricants

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Abstract:In this article an arbitrary Lagrangian-Eulerian (ALE) formulation for modelling cavitation in elastohydrodynamic lubrication (EHL) is derived and applied to line contact geometry. The method is developed in order to locate the position of cavitation onset along the length of the contacting region which gives the transition from liquid to vapour in the fluid. The ALE is implemented by introducing a spatial frame of reference in which the solution is required and a material frame of reference in which the governing equations are solved. The spatial frame is moved from the material frame according to the error in the Neumann pressure gradient constraint required at the cavitation location when Dirichlet constraints are imposed for pressure in the liquid phase. Results are calculated under both steady-state and transient operating conditions using a multigrid solver. The solutions obtained are compared to established literature and conventional approaches to modelling cavitation which show that the ALE formulation is an alternative, straightforward and accurate means of implementing such conditions in EHL. This is achieved without the penalties associated with the numerical modelling of Heaviside functions or free boundaries.

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Fluid film lubrication in the presence of cavitation: a mass-conserving two-dimensional formulation for compressible, piezoviscous and non-Newtonian fluids

Cited by 77 publications

References 30 publications

Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

Transient effects in lubricated textured bearings

An Arbitrary Lagrangian–Eulerian Formulation for Modelling Cavitation in the Elastohydrodynamic Lubrication of Line Contacts

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