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Technical Briefs

A Modification of the Switch Function in the Elrod Cavitation Algorithm

[+] Author and Article Information
M. Fesanghary

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803khonsari@me.lsu.edu

1

Corresponding author.

J. Tribol 133(2), 024501 (Mar 17, 2011) (4 pages) doi:10.1115/1.4003484 History: Received July 25, 2010; Revised December 27, 2010; Published March 17, 2011; Online March 17, 2011

The implementation of the mass-conservative cavitation algorithm, as derived by Elrod, requires an automatic setting of a binary switch function that delineates the full-film and cavitation zones. Abrupt changes associated with this function often causes convergence and instability issues. A method is that which improves numerical instability and overcomes the convergence issues caused by the conventional binary switch function. Two test cases are presented, which show that by using the new switching algorithm together with a successive over-relaxation solver, the Elrod cavitation algorithm converges up to 61% faster while it is less prone to numerical instabilities.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Pressure and film content along the center of journal bearing (y=L/2) for case study 1

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Figure 2

Effect of gFactor and relaxation factor on convergence speed (case study 1)

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Figure 3

Schematic of thrust bearing with dimples (9)

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Figure 4

Pressure profile for case study 2

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Figure 5

Effect of gFactor and relaxation factor on convergence speed (case study 2)

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