Surface roughness effects in elastohydrodynamic lubrication line contacts using couple stress fluid

Saini, P. K.; Kumar, Parveen; Tandon, Puneet

doi:10.1243/13506501jet303

Cited by 7 publications

(9 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accurate empirical formula for the film thickness of EHL elliptical contacts using couple stress lubricant [34] is a good substitute to earlier ones. The influence of couple stress on steady state thermal EHL line contact problem and, later investigation of compressible EHL line contact problem to demonstrate the combined influence of couple stress lubricant with wavy surface roughness on lubrication characteristics are presented in [35,36] respectively. For point contact problem [37] the effects of surface roughness and couple stress lubricant on EHL characteristics using average flow model equation are obtained.…”

Section: Couple Stress Fluidmentioning

confidence: 99%

“…The physical problem is described by the coupling of Reynolds equation, for the flow of lubricant, and elastic deformation equation of cylinders. For a steady isothermal couple stress lubricant flow, the dimensionless form of pressure P is described by Reynolds equation, [36],…”

Section: Approximation Of Jacobian (Matrix)-vector Productmentioning

confidence: 99%

“…The above described EHL line contact problem is investigated using Newton-Raphson technique [36] and convergence of the solution scheme for different combinations of high load-low speed and low load-high speed conditions are presented. The focus of the present paper is to analyze these findings in a more general computational set-up using Jacobian-free Newton multigrid method for obtaining fast converging and accurate solutions for various combinations of parameters of interest and for much larger values of couple stress parameter.…”

Section: Approximation Of Jacobian (Matrix)-vector Productmentioning

confidence: 99%

See 2 more Smart Citations

A novel numerical scheme for the analysis of effects of surface roughness on EHL line contact with couple stress fluid as lubricant

2018

View full text Add to dashboard Cite

In this article, a Jacobian-free Newton Multigrid (JFNMG) method is used for obtaining the solution of isothermal, steady and compressible elastohydrodynamic lubrication (EHL) line contact problem with surface roughness. The lubricant is a couple stress fluid. A finite difference scheme is used for the solution of EHL equations. The proposed JFNMG method, for the solution of resulting nonlinear system of algebraic equations, comprises nonlinear Newton iterations on the outer loop and linear multigrid iterations on the inner loop. It overcomes the limitations of conventional schemes for the investigation of the problems covering wide range of physical parameters of interest. For increasing values of couple stress parameter, there is an increase in minimum film thickness and considerable decrease (in height as well as spread) of pressure spike. Also, the sensitivity of height and spread of pressure spike as a function of load, couple stress parameter and other parameters are investigated.

show abstract

Section: Couple Stress Fluidmentioning

confidence: 99%

Section: Approximation Of Jacobian (Matrix)-vector Productmentioning

confidence: 99%

Section: Approximation Of Jacobian (Matrix)-vector Productmentioning

confidence: 99%

See 1 more Smart Citation

A novel numerical scheme for the analysis of effects of surface roughness on EHL line contact with couple stress fluid as lubricant

2018

View full text Add to dashboard Cite

show abstract

“…The Equations (28), (29), and (31) are discretized using second-order finite differences with uniform grid points x i , 1 ď i ď n, and the domain of interest is rX in , X o u t s " r´2, 1.5s, X c is the cavitation point to be determined in the solution process. The discretized form of modified Reynolds equation [27]:…”

Section: Numerical Experimentsmentioning

confidence: 99%

Investigation of Couple Stress Fluid and Surface Roughness Effects in the Elastohydrodynamic Lubrication Problems using Wavelet-Based Decoupled Method

Shiralashetti

Kantli

2016

Lubricants

View full text Add to dashboard Cite

Abstract:The standard decoupled method with Newton-generalized minimum residual procedure performs poorly or may break down when used to solve certain elastohydrodynamic lubrication problems. The authors Zargari et al., 2007 presented decoupled and coupled methods in which the limitations of the decoupled method for some set of physical parameters and slight variation in these values (physical parameters) give a non-convergence solution. To overcome this aspect the wavelet-based preconditioners technique is used in this paper to solve the elastohydrodynamic lubrication problem. The effect of coupled stress fluids on elastohydrodynamic lubrication behavior in smooth, as well as rough, contact is investigated using the proposed method, numerically, in a low-speed-high load condition. The elastohydrodynamic lubrication characteristics computed for couple stress fluids are found to have strong dependence on the couple stress parameter, which shows the versatility and applicability of the proposed method.

show abstract

“…However, this hypothesis is not realistic because all surfaces are rough. When the roughness and the film thickness are in the same order of magnitude, the surface roughness has a noticeable effect and must be considered when dealing with the elasto‐hydrodynamic lubrication performances . One of the methods used to assume theoretically the effect of roughness is homogenisation.…”

Section: Introductionmentioning

confidence: 99%

Coupled couple stress and surface roughness effects on elasto-hydrodynamic contact

et al. 2013

View full text Add to dashboard Cite

This paper deals with the combined effects of couple stress and surface roughness to inspect the elasto‐hydrodynamic performance of slider bearing systems. On the basis of the couple stress Stokes theory and homogenisation method, the homogenised generalised Reynolds equation including the slider bearing stationary surface deformation is derived. The total deformation include the deformation of smooth surface, taken into account by the elastic thin layer model, and the deformation of roughness corresponding to a sinusoidal normal displacement on an elastic half space of identical wavelength. The governing equations are discretised by the finite difference method, and the obtained algebraic equations are solved using the iterative overrelaxation Gauss–Seidel technique. The load‐carrying capacity and friction coefficient are presented for transverse, longitudinal and anisotropic roughness patterns for different values of the couple stress parameter in both rigid and deformable cases. The simulation results indicate that the interaction between couple stress, surface roughness and elastic deformation effects is significant. Copyright © 2013 John Wiley & Sons, Ltd.

show abstract

Surface roughness effects in elastohydrodynamic lubrication line contacts using couple stress fluid

Cited by 7 publications

References 12 publications

A novel numerical scheme for the analysis of effects of surface roughness on EHL line contact with couple stress fluid as lubricant

A novel numerical scheme for the analysis of effects of surface roughness on EHL line contact with couple stress fluid as lubricant

Investigation of Couple Stress Fluid and Surface Roughness Effects in the Elastohydrodynamic Lubrication Problems using Wavelet-Based Decoupled Method

Coupled couple stress and surface roughness effects on elasto-hydrodynamic contact

Contact Info

Product

Resources

About