A Mass-Conserving Algorithm for Dynamical Lubrication Problems With Cavitation

Ausas, Roberto F.; Jai, Mohammed; Buscaglia, Gustavo C.

doi:10.1115/1.3142903

Cited by 165 publications

(121 citation statements)

References 8 publications

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“…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%

“…However, more recently Ausas et al [8,9] have questioned the suitability of non-mass conserving cavitation algorithms of the type based on the Reynolds boundary condition, and used by Etsion and co-workers, for solving textured bearing problems. In these two papers it was clearly shown that load support is over predicted and friction coefficient under-predicted when a non-mass conserving formulation is applied.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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 conditions p n ða n Þ ¼ p n ðb n Þ ¼ 0 are imposed placing two virtual nodes at the positions a n and b n . The pressure at each finite volume is found by means of an iterative procedure similar to the one described in [20]. In the kth iteration of the iterative procedure, fp n,k i g i A P n is found according to…”

Section: Numerically Solve Reynolds Equation For P N : a Finite Volumementioning

confidence: 99%

“…The numerical procedure to solve the problem is based on a Newmark scheme as done in [20,13], in which we compute the new position and velocity according to…”

Section: Dynamical Testmentioning

confidence: 99%

Hydrodynamic Lubrication

2014

Encyclopedia of Lubricants and Lubrication

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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.

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“…The pressure of the region, where the rupture happens and the mixture of oil and gas exists, is the cavitation pressure and the pressure gradient is zero 12) . The mathematical is shown as Eq.…”

Section: Equivalent Radius Modelmentioning

confidence: 99%

The Research on Characteristics of Flow Field and Shear Torque of Oil Film for Hydro-viscous Drive

Cui

Zi-sheng

Deng

et al. 2016

JFPS International Journal of Fluid Power System

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The hydro-viscous drive (HVD) is an effective device to save energy and reduce consumption. In order to reveal the flow field characteristics and calculate the shear torque, the mathematical model of fluid flow characteristics was built. The characteristics of velocity distribution, pressure distribution and theoretical required flow rate were obtained through the step analytic method. Then cavitation was analyzed based on the Reynolds boundary conditions, and the equivalent radius and shear torque model were achieved. Meanwhile, the equivalent temperature model was introduced by considering temperature field. Finally, the test rig of torque characteristics was set up to testify the trend of fluid field and shear torque. The characteristics of flow field and shear torque during the full film shear stage in HVD can be forecasted much more accurately through both experimental research and theoretical modeling which mainly consisted of equivalent temperature model, equivalent radius model and shear torque model.

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A Mass-Conserving Algorithm for Dynamical Lubrication Problems With Cavitation

Cited by 165 publications

References 8 publications

Transient effects in lubricated textured bearings

Transient effects in lubricated textured bearings

Hydrodynamic Lubrication

The Research on Characteristics of Flow Field and Shear Torque of Oil Film for Hydro-viscous Drive

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