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Lubricants 2018, 6(1), 27; https://doi.org/10.3390/lubricants6010027

A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication

1
Chair of Mechanical Engineering, Montanuniverität Leoben, 8700 Leoben, Austria
2
Chair of Applied Mathematics, Montanuniversität Leoben, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Received: 18 December 2017 / Revised: 5 March 2018 / Accepted: 8 March 2018 / Published: 12 March 2018
(This article belongs to the Special Issue Friction and Lubrication of Sliding Bearings)
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Abstract

The common approach for the flow factor calculation is based on using the Reynolds equation to simulate the micro-level flow. However, for structured surfaces the fluid flow cannot be represented correctly, due to the assumptions made when deriving the Reynolds equation. In this work, a novel method using the Navier-Stokes equations for the calculation of the micro-level flow is presented and validated against results from Patir and Cheng. The three-dimensional lubrication gap was generated by a rough Gaussian random surface and a perfectly smooth moving counter surface, in order to be available for different numerical methods. The presented results illustrate similar trends for both the approaches. Additionally, the use of the Navier-Stokes equations allows for the observance of surface induced effects which cannot be resolved by the approach of Patir and Cheng. Furthermore, a numerical approach for a shear flow factor calculation with a rough moving surface is presented and validated against other simulation methods. While the validation is maintained with pressure- and temperature-independent density and viscosity, these effects will be taken into account for later research activities of textured surfaces. View Full-Text
Keywords: hydrodynamic lubrication; Reynolds equation; Navier-Stokes equations; flow factors hydrodynamic lubrication; Reynolds equation; Navier-Stokes equations; flow factors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pusterhofer, M.; Bergmann, P.; Summer, F.; Grün, F.; Brand, C. A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication. Lubricants 2018, 6, 27.

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