This is a BMBF project in cooperation with
Rockwell Collins Deutschland GmbH.
Modern ball bearings used in space applications
have to fulfill high requirements in extreme situations (high rotational
and pressure), especially
with respect to durability and lubricant consumption.
A basic understanding of
the dynamic processes involved such as
lubricant transport, film thickness, pressure distribution and thermal
is of high importance for future developments.
This application poses a variety of numerical challenges, such as
and extreme values of pressure. The lubricant is governed by the
Navier-Stokes equations and
a generalized Newtonian model. To simulate oil transport and oil
consumption, we have to
include the evolution of the free surface of the lubricant. Due to
speeds of up to 6000 rounds per minute, we observe locally very high
pressure values leading to deformations in ball and race. It is essential
consider these coupling effect between lubricant and structure into the
The goal of this project is a robust and reliable simulation of these
up to high rotational speeds.
Sketch of the geometry
Simulation of the evolution of the lubricant's free surface