Abstract
In this paper, an investigation of hydrodynamic performance for journal bearing lubricated by thin film is performed by three-dimensional CFD (computational fluid dynamic). Two regimes, i.e. laminar and turbulent regimes are of main interest. The sliding velocity was varied from 3000, 5000 and 10000. The numerical simulation shows that the velocity magnitude of the journal has a strong effect on the hydrodynamic pressure. In addition, it is found that an appropriate modelling of flow regime affects the predicted lubrication performance. From the overall analysis, both using laminar and turbulent regimes, the distribution of static hydrodynamic pressure shows a similar trend. It is also found that at the beginning of the contact, the static pressure is low, and then, it gradually increases to the highest point, and finally drops significantly.
Highlights
A thin film lubricated journal bearing has attracted much attention
The main advantage of computational fluid dynamics (CFD) code is that it uses the full Navier – Stokes equations and provides a solution to the flow problem based on finite volume method (Panday et al, 2012)
This paper is aimed at analyzing the journal bearing using laminar and turbulent approaches by employing CFD
Summary
A thin film lubricated journal bearing has attracted much attention. Following the progress in numerical analysis and technology, many researchers began to use commercial computational fluid dynamics (CFD) program in their investigations. They solved Navier-Stokes equations by using the FLUENT package and compared the results of the developed 3-D CFD model with theoretical and experimental results of previous investigations, for both Newtonian and Bingham lubricants, and found to be in a very good agreement. Reynolds Equation solution for unsteady laminar newtonian flow of lubricated oil was presented to enable initial opinion to hydrodynamic pressure and velocity distribution as a basic slide bearing operating parameter.
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