Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position
For decades, journal bearings have been designed based on the half-Sommerfeld equations. The semi-analytical solution of the conservation equations for mass and momentum leads to the pressure distribution along the journal. However, this approach admits negative values for the pressure, phenomenon w...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/23/8573 |
| _version_ | 1797546190172061696 |
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| author | Franco Concli |
| author_facet | Franco Concli |
| author_sort | Franco Concli |
| collection | DOAJ |
| description | For decades, journal bearings have been designed based on the half-Sommerfeld equations. The semi-analytical solution of the conservation equations for mass and momentum leads to the pressure distribution along the journal. However, this approach admits negative values for the pressure, phenomenon without experimental evidence. To overcome this, negative values of the pressure are artificially substituted with the vaporization pressure. This hypothesis leads to reasonable results, even if for a deeper understanding of the physics behind the lubrication and the supporting effects, cavitation should be considered and included in the mathematical model. In a previous paper, the author has already shown the capability of computational fluid dynamics to accurately reproduce the experimental evidences including the Kunz cavitation model in the calculations. The computational fluid dynamics (CFD) results were compared in terms of pressure distribution with experimental data coming from different configurations. The CFD model was coupled with an analytical approach in order to calculate the equilibrium position and the trajectory of the journal. Specifically, the approach was used to study a bearing that was designed to operate within tight tolerances and speeds up to almost 30,000 rpm for operation in a gearbox. |
| first_indexed | 2024-03-10T14:26:33Z |
| format | Article |
| id | doaj.art-c59d1056355a4a069310a08dd45a37ed |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T14:26:33Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c59d1056355a4a069310a08dd45a37ed2023-11-20T22:57:48ZengMDPI AGApplied Sciences2076-34172020-11-011023857310.3390/app10238573Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium PositionFranco Concli0Faculty of Science and Technology, Free University of Bolzano/Bozen, 39100 Bolzano, ItalyFor decades, journal bearings have been designed based on the half-Sommerfeld equations. The semi-analytical solution of the conservation equations for mass and momentum leads to the pressure distribution along the journal. However, this approach admits negative values for the pressure, phenomenon without experimental evidence. To overcome this, negative values of the pressure are artificially substituted with the vaporization pressure. This hypothesis leads to reasonable results, even if for a deeper understanding of the physics behind the lubrication and the supporting effects, cavitation should be considered and included in the mathematical model. In a previous paper, the author has already shown the capability of computational fluid dynamics to accurately reproduce the experimental evidences including the Kunz cavitation model in the calculations. The computational fluid dynamics (CFD) results were compared in terms of pressure distribution with experimental data coming from different configurations. The CFD model was coupled with an analytical approach in order to calculate the equilibrium position and the trajectory of the journal. Specifically, the approach was used to study a bearing that was designed to operate within tight tolerances and speeds up to almost 30,000 rpm for operation in a gearbox.https://www.mdpi.com/2076-3417/10/23/8573journal bearinghybrid CFD-analytical approachsimulationtrajectoryOpenFOAM<sup>®</sup> cavitation |
| spellingShingle | Franco Concli Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position Applied Sciences journal bearing hybrid CFD-analytical approach simulation trajectory OpenFOAM<sup>®</sup> cavitation |
| title | Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position |
| title_full | Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position |
| title_fullStr | Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position |
| title_full_unstemmed | Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position |
| title_short | Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position |
| title_sort | journal bearing an integrated cfd analytical approach for the estimation of the trajectory and equilibrium position |
| topic | journal bearing hybrid CFD-analytical approach simulation trajectory OpenFOAM<sup>®</sup> cavitation |
| url | https://www.mdpi.com/2076-3417/10/23/8573 |
| work_keys_str_mv | AT francoconcli journalbearinganintegratedcfdanalyticalapproachfortheestimationofthetrajectoryandequilibriumposition |