A fluid structure interaction—EHD model of the lubricating gaps in external gear machines: Formulation and validation

This paper presents a fluid structure interaction (FSI) model for the simulation of the flow in the lubricating gaps between gears and lateral bushes in external gear machines (EGMs). The proposed model is capable of accounting for elasto-hydrodynamic effects in the lubricant film, and can predict the lubricant film thickness. Three different constraint methods are considered as concerns the structural problem: “ideally supported”, “inertia relief” and a “low pressure” constraint specifically formulated for EGMs. The proposed model is validated against measurements performed on an experimental prototype. Detailed formulation of the FSI model as well as significant simulation results are presented for a wide range of operating conditions along with comparison to experimental results.

► Novel elastohydrodynamic model of lubricating gaps in external gear machines is presented. ► The gap simulation algorithm was integrated with the entire machine operation. ► The model allows for the prediction of lubricating interface film thickness. ► Constraint methodologies of elastohydrodynamic simulations are explored. ► Experimental validation of elastohydrodynamic model is presented.