Excerpt from the Proc Analysis of H R 1 Sardar Vallabhbhai Nat * Corresponding Author: At/P Abstract: This paper presents the hydrodynamic plain journal bearing us Multiphysics 4.3a software. Using pressure distribution in plain journ obtained by steady state analysis of bearing. Generalized Reynolds equatio analyzing hydrodynamic journal COMSOL as well as by analytica applying Sommerfeld boundary con Reynolds equation is solved for tw hydrodynamic journal bearing called i journal bearing and infinitely long jo Results obtained for pressure di simulation are compared with analytic shows that the solutions are approxima the analytical solutions. The compa decent for both version of the plain jo because the analytical and simu correspond to each other. Only the ma pressure build-up/drop differs, but this by the analytical assumptions and approximation. Keywords - hydrodynamic plain jo COMSOL Multiphysics TM , Reynol infinitely short journal bearing, infinite bearing, Sommerfeld boundary conditio 1. Introduction Hydrodynamic type journal considered to be a vital component machinery. A journal bearing consists cylindrical body (sleeve) separated fr shaft by a layer of lubricant. Load car of journal bearing is dependent on pres in layer of lubricant during rotation journal. Hence, it is necessary to ana film of lubricant using latest simulation COMSOL Multiphysics. This paper simulation of fluid film of lubricant in plain journal bearing using COMS Generalized Reynolds equation is used pressure distribution using Sommerf conditions. This Reynold equation infinitely short journal bearing and i journal bearing theoretically and im COMSOL to get the simulation results ceedings of the 2013 COMSOL Conference in Bang Hydrodynamic Plain Journal Beari Ravindra M. Mane* 1 , Sandeep Soni 1 tional Institute of Technology, Surat, Gujarat, India- Po: Varkute-Mhaswad, Tal: Man, Dist: Satara, MH, India [email protected]3D model of sing COMSOL g 3D Model, nal bearing is f plain journal on is used for bearing by al method by nditions. This wo theories of infinitely short ournal bearing. istribution by cal results and ately similar to arison is quite ournal bearing, ulation results agnitude of the can be caused the software ournal bearing, lds equation, ely long journal ons. bearings are of all rotating of a stationary rom a rotating rrying capacity ssure generated n of shaft or alyze the fluid n software like represents the hydrodynamic SOL software. d to obtain the feld boundary is solved for infinitely long mplemented in and comparison is made between sim analytical results. Figure 1. Hydrodynamic long 2. Reynolds Governing Equ The hydrodynamic the hydrodynamic lubricated bearing explained by Reynolds’s Equa theory of Reynolds is based on that were adopted to simplify derivations. The following are th of classical hydrodynamic lubric flow is laminar, ii) the fluid lubr Newtonian, and incompressible, slip at the boundary, iv) the velo direction is negligible in compari velocity components in the x a velocity gradients along the thin and z directions, are small and n the velocity gradients across the f the curvature can be ignored, variations in the y direction are v effect is negligible in the equati the force of gravity on the fluid fluid viscosity, m, is constant. Hydrodynamic lubricatio mathematically in the form of an originally derived by Reynolds known as the ‘Reynolds equation ways of deriving this equatio galore ing 395007 a-415509, mulation results and journal bearing. uation eory applied to the g is mathematically ation. The classical several assumptions y the mathematical he basic assumptions cation theory: i) the ricant is continuous, iii) there is no fluid ocity component in y ison to the other two and z directions, v) n fluid film, in the x negligible relative to film, vi) the effect of , vii) the pressure very small and their ions of motion, viii) is negligible, ix) the on can be expressed equation which was s and is commonly n’. There are several on. Since it is a
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Excerpt from the Proceedings of the 2013 COMSOL Conference in Bangalore
Analysis of Hydrodynamic Plain
Ravindra M. Mane*1 Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India
*Corresponding Author: At/Po: Varkute
Abstract: This paper presents the 3D model of
hydrodynamic plain journal bearing using COMSOL
Multiphysics 4.3a software. Using 3D Model,
pressure distribution in plain journal bearing is
obtained by steady state analysis of plain journal
bearing. Generalized Reynolds equation is used for
analyzing hydrodynamic journal bearing by
COMSOL as well as by analytical method by
applying Sommerfeld boundary conditions. This
Reynolds equation is solved for two theories of
hydrodynamic journal bearing called infinitely short
journal bearing and infinitely long journal bearing.
Results obtained for pressure distribution
simulation are compared with analytical results
shows that the solutions are approximately similar to
the analytical solutions. The comparison is quite
decent for both version of the plain journal bearing,
because the analytical and simulation results
correspond to each other. Only the magnitude of the
pressure build-up/drop differs, but this can be caused
by the analytical assumptions and the software
approximation.
Keywords - hydrodynamic plain journal bearing,
COMSOL MultiphysicsTM, Reynolds equation,
infinitely short journal bearing, infinitely long journal
bearing, Sommerfeld boundary conditions.
1. Introduction
Hydrodynamic type journal bearings are
considered to be a vital component of all rotating
machinery. A journal bearing consists of a stationary
cylindrical body (sleeve) separated from a rotating
shaft by a layer of lubricant. Load carrying capacity
of journal bearing is dependent on pressure g
in layer of lubricant during rotation of shaft or
journal. Hence, it is necessary to analyze the fluid
film of lubricant using latest simulation software like
COMSOL Multiphysics. This paper represents the
simulation of fluid film of lubricant in
plain journal bearing using COMSOL software.
Generalized Reynolds equation is used to obtain the
pressure distribution using Sommerfeld boundary
conditions. This Reynold equation is solved for
infinitely short journal bearing and infinitely lo
journal bearing theoretically and implemented in
COMSOL to get the simulation results and
Excerpt from the Proceedings of the 2013 COMSOL Conference in Bangalore
Hydrodynamic Plain Journal Bearing
Ravindra M. Mane*1, Sandeep Soni
1
Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India-Corresponding Author: At/Po: Varkute-Mhaswad, Tal: Man, Dist: Satara, MH, India