PERIOD: APRIL In this course this numerical modelling of full film lubricated systems is explained both in theory and in numerical lab-sessions. Progressive more difficult multiphysics models are developed and studied.

Many standard machine components are lubricated using a fluidic medium, either gas or liquid. Fluid film bearings are an obvious example, but many seals are film lubricated as well, and also the contact interface between gear teeth in a gearbox is full film lubricated. Prediction of the performance of these machine components hinges on the thorough understanding of the lubricating film. The modelling of the lubrication film in full film lubricated systems usually starts with the Reynolds’ equation, which is a simplification of the Navier-Stokes equations that is valid provided a long list of assumptions are valid. In conjunction with the flow analysis of the lubricating film, a model of a lubricating system can also include a thermal model of the film and the solid surfaces adjacent to the film. In addition, the deformation of these surfaces may be part of the model. In this excellence course the numerical multiphysics modelling of full film lubricated systems will be covered, using a commercially available, powerful simulation software, COMSOL Multiphysics (CM). For the duration of this course, the students will be able to use CM using a trial license provided. Within the Politecnico of Torino a number of licenses are available that can be used after this trial period. This course will consist of a mix of lectures and lab-sessions, covering three half days (3x4 hours). During the lectures the steps in modelling full film systems will be explained, followed by the lab sessions in which the students will work on example problems. The provisional list of topics to be discussed: - Derivation of Reynolds’ equation, - Basic full film modelling using fluid and gas, and calculation of load and friction, - Modelling of cavitation effects in full film modelling, - Calculation of dynamic properties of a lubricating film, - Methods to model conjugate heat generation and transfer, - Methods to introduce elastic deformation of the mating surfaces: hard EHL and soft EHL, - Full 3D modelling of the lubricating film.

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Gli studenti e le studentesse con disabilità o con Disturbi Specifici di Apprendimento (DSA), oltre alla segnalazione tramite procedura informatizzata, sono invitati a comunicare anche direttamente al/la docente titolare dell'insegnamento, con un preavviso non inferiore ad una settimana dall'avvio della sessione d'esame, gli strumenti compensativi concordati con l'Unità Special Needs, al fine di permettere al/la docente la declinazione più idonea in riferimento alla specifica tipologia di esame.