Stabilized finite elements for the solution of the Reynolds equation considering cavitation

Abstract

The Reynolds equation, combined with the Elrod algorithm for including the effect of cavitation, resembles a nonlinear convection–diffusion–reaction (CDR) equation. Its solution by finite elements is prone to oscillations in convection-dominated regions, which are present whenever cavitation occurs. We propose a stabilized finite-element method that is based on the variational multiscale method and exploits the concept of orthogonal subgrid scales. We demonstrate that this approach only requires one additional term in the weak form to obtain a stable method that converges optimally when performing mesh refinement.