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Research Papers: Hydrodynamic Lubrication

The Effects of Anisotropic Surface Topography and Relative Motion on Hydrodynamic Lubrication

[+] Author and Article Information
Yang Yang

Institute of Applied Mechanics,
Clausthal University of Technology,
Clausthal-Zellerfeld 38678, Germany
e-mail: yang.yang@tu-clausthal.de

Gunther Brenner

Professor
Institute of Applied Mechanics,
Clausthal University of Technology,
Clausthal-Zellerfeld 38678, Germany
e-mail: gunther.brenner@tu-clausthal.de

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 2, 2013; final manuscript received March 23, 2014; published online April 25, 2014. Assoc. Editor: Robert L. Jackson.

J. Tribol 136(3), 031705 (Apr 25, 2014) (7 pages) Paper No: TRIB-13-1074; doi: 10.1115/1.4027293 History: Received April 02, 2013; Accepted March 23, 2014; Revised March 23, 2014

According to the extended Reynolds theory, surface roughness contributes to the pressure buildup as well as shear stress and transport in the film flow. The effect is usually quantified using pressure and shear flow factors. The influence of the pattern directionality relative to the sliding motion may be considered using an anisotropic model of flow factors. The goal of the present study is to quantify these effects based on a precise numerical solution of the Navier–Stokes equations. For the computation the open source finite volume code OpenFOAM is used. The computational setup allows consideration of the lubrication film between two rough surfaces in relative motion. The roughness of the surfaces is simplified and parameterized using trigonometric functions.

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Figures

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Fig. 1

Sketch of rough surfaces in relative motion

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Fig. 2

Sketch of the 2D computational domains

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Fig. 3

Sketch of the 2D surface structure

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Fig. 4

Surface configurations investigated in the present study

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Fig. 5

2D computational domain and mesh changing in time, with period T

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Fig. 12

Pressure flow factor for flow in wavy channel with roughness anisotropy

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Fig. 11

Shear flow factor for flow in wavy channel with roughness anisotropy in sliding motion

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Fig. 10

Flow factors for flow in an isotropic wavy channel with sliding motion

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Fig. 9

Pressure flow factor for flow in a wavy channel

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Fig. 8

Shear flow factor for flow in a wavy channel with sliding motion

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Fig. 7

Comparison of velocity profiles, obtained using the steady-state and the transient approach in OpenFOAM

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Fig. 6

Flow factors depending on the dimensionless gap size

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