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Numerical Simulation of Effective Viscosity Distribution of Power-Law Engine Oil in Piston–Cylinder Lubrication Under High Shear Conditions

Authors

  • Andre Ronaldo Situmorang Universitas Sumatera Utara
  • Tulus Universitas Sumatera Utara

DOI:

https://doi.org/10.32734/jormtt.v8i1.24922

Keywords:

Computational Fluid Dynamics, Effective Viscosity, Engine Oil, Power-Law Model, Piston–Cylinder Lubrication, Shear Rate, Shear-Thinning Behavior

Abstract

This study investigates the behavior of engine oil modeled as a non-Newtonian pseudoplastic fluid using the Power-Law equation under high operational conditions. The computational domain represents the lubricating oil film between the piston and cylinder wall. The governing equations include incompressible continuity and Navier–Stokes equa- tions coupled with a shear-rate-dependent viscosity model. Results show that shear rate con- centrates near the piston surface, reaching the order of 107 s−1 due to strong velocity gradients. As a consequence, effective viscosity decreases significantly in high shear regions, confirming shear-thinning behavior. The viscosity reduction directly affects the hydrodynamic pressure distribution while maintaining stable lubrication performance. These findings highlight the importance of incorporating shear-dependent viscosity to accurately predict lubrication characteristics in piston–cylinder systems operating at elevated shear conditions.

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Published

2026-05-20

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How to Cite

[1]
A. R. Situmorang and Tulus, “Numerical Simulation of Effective Viscosity Distribution of Power-Law Engine Oil in Piston–Cylinder Lubrication Under High Shear Conditions”, J. of Research in Math. Trends and Tech., vol. 8, no. 1, May 2026.

Issue

Vol. 8 No. 1 (2026): Journal of Research in Mathematics Trends and Technology (JoRMTT)

Section

Articles

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