A two-way FSI analysis of multiphase flow in hydrodynamic journal bearing with cavitation

Dhande, D. Y.; Pande, D. W.

doi:10.1007/s40430-017-0750-8

Cited by 38 publications

(28 citation statements)

References 24 publications

(26 reference statements)

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“…In the above equation, P cav is the pressure in the cavitation region, = cav is the mass fraction (dimensionless density) of the lubricant film, and g is the switch function, and makes it possible to solve one single equation (modified Reynolds equation) for both the full film and the oil whip regions. The value of the function g in the region of the full film is equal to 1, and in the oil whip region, it is equal to zero [20]. It could be shown that the modified form of the Reynolds equation 7is achievable in the following form, taking into account the compressibility effects due to the cavitation [Eq.…”

Section: Fig 1 Simple Schematic Of the Journal Bearing Geometrymentioning

confidence: 99%

“…Dhande and Pande [20] utilized the structured hexahedral and unstructured tetrahedral meshes to discretize fluid domain and solid domain (journal bearing), respectively, and achieved the very accurate pressure distribution in the hydrodynamic journal bearing by solving the Navier-Stokes equations. However, in the present research, the model is based on the two-dimensional Reynolds equation (9) described in Sect.…”

Section: Numerical Considerationsmentioning

confidence: 99%

“…It was shown that the proposed cavitation algorithm results were in good agreement with the reference measurement data. Dhande and Pande [20] presented the three-dimensional investigation of a hydrodynamic journal bearing with integrated cavitation. The modeling was implemented considering the realistic bearing deformations by two-way fluid-structure interaction (FSI) along with cavitation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

Hekmat

Biukpour

2019

J Braz. Soc. Mech. Sci. Eng.

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The journal bearings are one of the main components of the rotating machines and always bear considerable weight and dynamic stresses. Bearing defect may cause bending and eventually axis fracture and, in some cases, lead to an increase in the temperature of other components. One of the most important challenges of this type of bearings is the instability of the oil film layer, which appears as oil whirl and oil whip. The main objective of this research is the numerical analysis of the journal bearing of a centrifugal pump and the investigation of variations in the eccentricity and the rotation of the bearing to detect the instability resulting from the oil whirl and whip. For this purpose, assuming the steady and laminar flow, the Reynolds theory modified by the Elrod-Adams cavitation model is utilized. In addition, the finite element method is used for the numerical solution. The results indicate that the pressure on the bearing shell increases considering the effect of the oil whip phenomenon. Moreover, by increasing the eccentricity ratio, the pressure applied to the bearing increases and the mass fraction of the oil film decreases. After that, in order to improve the performance, by creating a horizontal groove in a simple bearing (without groove), the oil whirl and whip are numerically analyzed and the effect of the eccentricity as well as the rotational speed of the modified bearing is investigated. Numerical results indicate that the presence of the groove in the bearings causes the pressure on the grooved bearings to decrease dramatically. As a result, the probability of occurrence of the oil instability phenomenon in this case will be less than simple state (no groove). In addition, in this case, it could be observed that as the rotational speed of the grooved bearing increased, the pressure applied around the groove bearing from the oil film increases. However, the pressure applied to the grooved bearings is much less than the pressure applied to the simple bearings.

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Section: Fig 1 Simple Schematic Of the Journal Bearing Geometrymentioning

confidence: 99%

Section: Numerical Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

Hekmat

Biukpour

2019

J Braz. Soc. Mech. Sci. Eng.

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“…Based on the CFD-FSI methodology, Wang et al 6 found that elastic deformation increased with increasing rotating speed and decreasing Poisson's ratio for the water-lubricated journal bearing. Dhande and Pande 7 proposed that the peak pressure was decreased due to cavitation effect when elastic deformation was considered. Lin et al 8 used also the CFD-FSI approach to study effects of recess configuration on lubricating properties, and their work revealed that ladder-type recess could help journal bearings inhibit oil temperature rise and cavitation effect.…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal and elastic deformations on lubricating properties of the textured journal bearing

Zhang

Chen

Wang

2019

Advances in Mechanical Engineering

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Hydrodynamic journal bearing is an important part of rotary machine and faces many challenges such as high rotating speed, heavy specific pressure, and large temperature rise with the development of industry. These challenges lead to notable thermal and elastic deformations of the journal bearing. Surface texture has been proved to be a valid method to promote bearing lubricating properties. However, effects of thermal and elastic deformations on lubricating properties of the textured journal bearing have not been clearly analyzed. Based on this, the article presents a method to transform thermal–structural–fluid interaction into thermal–structural interaction and thermal–fluid interaction based on textured journal bearing model. Cavitation and temperature-viscosity effects are also considered. Based on this method, action mechanisms of surface texture on lubricating properties are discussed considering elastic and thermal deformations, and effects of elastic and thermal deformations on the textured journal bearing are also investigated. The results show that the load carrying capacity and the maximum oil film pressure of the textured journal bearing both increase when elastic and thermal deformations are considered. Optimal texture parameters can enhance the backflow effect in dimples and restraint cavitation phenomenon in the oil film rupture region. Meanwhile, inertial and cavitation effects caused by surface texture have significant effects on elastic and thermal deformations of the journal bearing.

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“…Hence, there is a need to develop an easy and user-friendly method for three lobe bearing analysis. The method described in detail by Dhande and Pande [3,4] is used here for analysing three lobe bearing. The method is based on computation of hydrodynamic fluid forces using computational fluid dynamics (CFD) and the bearing shell deformations using finite element structural module.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

Dhande

Pande

Lanjewar

2018

J Braz. Soc. Mech. Sci. Eng.

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This work is continuation of the earlier work published on an analysis of plain cylindrical journal bearing using CFD-FSI technique. Here, the technique is applied to analyse three lobe journal bearing. The numerical simulations were carried out using ANSYS WorkbenchÒ software. The hydrodynamic pressures were computed using computational fluid dynamics (CFD), and structural deformations were estimated using structural module. The fluid pressure forces and displacements were transferred via inbuilt transfer interface available in the software. The optimization of the journal bearing position was carried out based on response surface optimization. The numerical results were compared with experimental results which were available in the literature, and a good agreement was found. The proposed numerical method was implemented to study the pressure distribution in three lobe journal bearing considered for study at three eccentricity ratios 0.25, 0.6 and 0.75 for various speeds ranging from 1000 to 4000 RPM in order to study effect of eccentricity ratio and speed on static pressure distribution in the bearing. Preload factor of 0.5 was considered for the study. The results were compared with a set of experimental data obtained on a test rig developed by the authors. The uncertainty analysis of the experimental results was also carried out, and all the results were found in expected range of pressure.

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A two-way FSI analysis of multiphase flow in hydrodynamic journal bearing with cavitation

Cited by 38 publications

References 24 publications

Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

Numerical study of the oil whirl phenomenon in a hydrodynamic journal bearing

Effects of thermal and elastic deformations on lubricating properties of the textured journal bearing

Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

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