This study focuses on the thermohydrodynamic lubrication (THD) analysis of fluid film bearings with steps on the bearing surface, such as Rayleigh step. In general, the Reynolds equation does not satisfy the continuity of fluid velocity components at steps. This discontinuity results in the difficulty to solve the energy equation for the lubricants by finite differential method (FDM), because the energy equation needs the velocity components explicitly. The authors have solved this issue by introducing the equivalent clearance height and the equivalent gradient of the clearance height at steps. These parameters remove the discontinuity of velocity components, and the Reynolds equations can be solved for any bearing surfaces with step regions by FDM. Moreover, this method results in pseudocontinuous velocity components, which enables the energy equation to be solved as well. This paper describes this method with one-dimensional and equal grids model. The numerical results of pressure and temperature distributions by the proposed method for an infinite width Rayleigh step bearing agree well with the results obtained by solving full Navier–Stokes equations with semi-implicit method for pressure-linked equations revised (SIMPLER) method.

References

1.
Dowson
,
D.
,
1962
, “
A Generalized Reynolds Equation for Fluid Film Lubrication
,”
Int. J. Mech. Sci.
,
4
(
2
), pp.
159
170
.
2.
Tanaka
,
M.
,
2000
, “
Recent Thermohydrodynamic Analyses and Designs of Thick-Film Bearings
,”
J. Eng. Tribol.
,
214
(
1
), pp.
107
122
.
3.
Dobrica
,
M.
, and
Fillon
,
M.
,
2005
, “
Reynolds' Model Suitability in Simulation Rayleigh Step Bearing Thermo-Hydrodynamic Problems
,”
Tribol. Trans.
,
48
(
4
), pp.
522
530
.
4.
Dobrica
,
M. B.
, and
Fillon
,
M.
,
2006
, “
Thermo-Hydrodynamic Behavior of a Slider Pocket Bearing
,”
ASME J. Tribol.
,
128
(
2
), pp.
312
318
.
5.
Patankar
,
S. V.
,
1981
, “
A Calculation Procedure for Two-Dimensional Elliptic Situations
,”
Numer. Heat Transfer
,
4
(
4
), pp.
409
425
.
You do not currently have access to this content.