A mass–conserving algorithm for dynamical lubrication problems with cavitation

A numerical algorithm for fully–dynamical lubrication problems based on the Elrod– Adams formulation of Reynolds equation with mass–conserving boundary conditions is described. A simple but effective relaxation scheme is used to update the solution maintaining the complementarity conditions on the variables that represents the pressure and fluid fraction. The equations of motion are discretized in time using Newmark’s scheme, and the dynamical variables are updated within the same relaxation process just mentioned. The good behavior of the proposed algorithm is illustrated in two examples: Oscillatory squeeze flow (for which the exact solution is available) and a dynamically loaded journal bearing. This article is accompanied by the ready–to–compile source code with the implementation of the proposed algorithm, which is publicly available at www.lcad.icmc.usp.br/∼buscaglia/download. Nomenclature Notice that all quantities are non–dimensional. B Bush width.