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<p>A numerical investigation is conducted to study the influence of viscous shear on a finite porous journal bearing with heterogeneous slip/no-slip surfaces. The Brinkman-extended Darcy model (BEDM) is employed to derive the generalized Reynolds equation, which is solved using the finite difference method (FDM) in conjunction with the Preconditioned Conjugate Gradient Method (PCGM). Christensen’s stochastic model is used to incorporate the effect of surface roughness. The study reveals that the inclusion of viscous shear significantly enhances pressure distribution within the lubricating film, resulting in an improved load-carrying capacity. The structural parameter governing viscous shear plays a major role, with higher values leading to greater pressure build-up. Increased eccentricity enhances peak pressure due to a reduction in film thickness. The effect of surface roughness is also pronounced—greater roughness intensifies pressure retention and improves bearing performance. The findings indicate that viscous shear and surface roughness are critical in improving the static performance of journal bearings, while permeability variation has only a marginal impact. This approach is particularly pertinent to contemporary applications, such as aerospace bearings, hybrid engine supports, and precision rotors, where micro-features of surfaces and boundary interactions significantly impact bearing performance&#xa0;and&#xa0;longevity.</p>

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Numerical computation of viscous shear on a finite journal bearing with heterogeneous surfaces using roughness phenomenon

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • M. Somashekhar,
  • G. K. Kalavathi,
  • M. G. Vasundhara,
  • P. A. Dinesh,
  • N. Manjunatha

摘要

A numerical investigation is conducted to study the influence of viscous shear on a finite porous journal bearing with heterogeneous slip/no-slip surfaces. The Brinkman-extended Darcy model (BEDM) is employed to derive the generalized Reynolds equation, which is solved using the finite difference method (FDM) in conjunction with the Preconditioned Conjugate Gradient Method (PCGM). Christensen’s stochastic model is used to incorporate the effect of surface roughness. The study reveals that the inclusion of viscous shear significantly enhances pressure distribution within the lubricating film, resulting in an improved load-carrying capacity. The structural parameter governing viscous shear plays a major role, with higher values leading to greater pressure build-up. Increased eccentricity enhances peak pressure due to a reduction in film thickness. The effect of surface roughness is also pronounced—greater roughness intensifies pressure retention and improves bearing performance. The findings indicate that viscous shear and surface roughness are critical in improving the static performance of journal bearings, while permeability variation has only a marginal impact. This approach is particularly pertinent to contemporary applications, such as aerospace bearings, hybrid engine supports, and precision rotors, where micro-features of surfaces and boundary interactions significantly impact bearing performance and longevity.