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The use of multigrid techniques in the solution of the Elrod algorithm for a dynamically loaded journal bearingA numerical solution to a theoretical model of vapor cavitation in a dynamically loaded journal bearing is developed, utilizing a multigrid iterative technique. The code is compared with a presently existing direct solution in terms of computational time and accuracy. The model is based on the Elrod algorithm, a control volume approach to the Reynolds equation which mimics the Jakobssen-Floberg and Olsson cavitation theory. Besides accounting for a moving cavitation boundary and conservation of mass at the boundary, it also conserves mass within the cavitated region via liquid striations. The mixed nature of the equations (elliptic in the full film zone and nonelliptic in the cavitated zone) coupled with the dynamic aspects of the problem create interesting difficulties for the present solution approach. Emphasis is placed on the methods found to eliminate solution instabilities. Excellent results are obtained for both accuracy and reduction of computational time.
Document ID
19880008570
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Woods, Claudia M.
(Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
February 1, 1988
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-180873
E-3897
NAS 1.26:180873
Accession Number
88N17954
Funding Number(s)
CONTRACT_GRANT: NCC3-30
PROJECT: RTOP 505-63-1A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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