PhD Candidate - Computational Tribology
|Workplace||Flemish Region, Ghent, Belgium|
Elasto-Hydrodynamic Lubrication (EHL) is a specific lubrication regime which typically occurs in non-conformal contacts, such as ball bearings, roller bearing, gear teeth,.. and is therefore very relevant in many machine applications. EHL is characterized by thin lubricant films (50 nm-1 micron) in which the hydrodynamic pressure can reach values up to GPa range (1-5 GPa), inducing elastic deformation of the opposing contact surfaces. At such high pressures, the lubricant becomes compressible, and behaves in a highly non-Newtonian way by local solidification and shear-thinning.
Accurate computational simulation of EHL (Reynolds, CFD) requires therefore an accurate description of the lubricant’s compressibility and the rheology (i.e. piezo-viscosity and shear thinning) as well as the thermal properties (specific heat, conductivity), wall slip and cavitation. Today, however, mainly empirical constitutive models are applied, which typically involve curve fitting of experimental data, obtained for a particular common lubricant and under specific conditions. Hence, their range of applicability is rarely questioned when applying them to other lubricants, surface materials or operating conditions. Obviously such generalized empiricism does not contribute to the versatility, accuracy and reliability of continuum computational methodologies.
In the past decades Molecular Dynamics (MD) has emerged as a more sophisticated computational approach to study interfacial phenomena and thin film rheology. Such computational approach offers the advantage to obtain an accurate estimate of the lubricant’s thermo-mechanical properties, by direct simulation of the lubricants molecular structure subject to different conditions of pressure, temperature, shear etc..
Your job will consist of developing a Multiscale Modelling framework, in which non-equilibrium Molecular Dynamics is exploited to
1) derive appropriate constitutive relations that can be used in continuum simulation techniques for EHL, and
2) smart automated coupling of EHL solvers, to the MD solver for the atomistic description of local lubricant properties, near-wall effects, molecular layering, mechanochemistry etc.
Profile of the candidate
How to apply
To apply, please complete the application form you find at ?url=https%3A%2F%2Fwww.ugent.be%2Fea%2Feemmecs%2Fen%2Fresearch%2Fsoete%2Fvacancies%2Fapplicationform%2Fat_download%2Ffile&module=jobs&id=984" target="_blank" rel="nofollow">https://www.ugent.be/ea/eemmecs/en/research/soete/vacancies/applicationform/at_download/file and send it in pdf format to dieter.fauconnier [at] ugent[.]be before November 1st 2018. Your application will be taken into consideration on condition that all fields in the application form are completed properly.
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