Results 11 to 20 of about 4,129,928 (338)

Fundamentals of Physics-Informed Neural Networks Applied to Solve the Reynolds Boundary Value Problem

open access: yesLubricants, 2021
This paper presents a complete derivation and design of a physics-informed neural network (PINN) applicable to solve initial and boundary value problems described by linear ordinary differential equations. The objective with this technical note is not to
Andreas Almqvist
doaj   +1 more source

Effects of surface roughness on molecular gas lubrication (Direct simulation Monte-Carlo analysis for shear flow)

open access: yesNihon Kikai Gakkai ronbunshu, 2020
Molecular gas film lubrication (MGL) equation, which is derived based on linearized Boltzmann equation, is the reliable means to analyze the molecular gas flow in the narrow channel, whose thickness is as thin as the molecular mean free pass. Though, the
Jun-ichi ICHIHARA
doaj   +1 more source

On flow of power-law fluids between adjacent surfaces: Why is it possible to derive a Reynolds-type equation for pressure-driven flow, but not for shear-driven flow?

open access: yesApplications in Engineering Science, 2023
Flows of incompressible Navier–Stokes (Newtonian) fluids between adjacent surfaces are encountered in numerous practical applications, such as seal leakage and bearing lubrication.
Andreas Almqvist   +3 more
doaj   +1 more source

Local correlation-based transition models for high-Reynolds-number wind-turbine airfoils [PDF]

open access: yesWind Energy Science, 2022
Modern wind-turbine airfoil design requires robust performance predictions for varying thicknesses, shapes, and appropriate Reynolds numbers. The airfoils of current large offshore wind turbines operate with chord-based Reynolds numbers in the range of 3–
Y. S. Jung   +3 more
doaj   +1 more source

Tribotronic Analysis of Internal Combustion Engine Compression Ring

open access: yesTribology Online, 2021
The influence of operating conditions of the compression rings on the engine power losses affects confoundedly the design of the Internal Combustion Engines (ICEs).
Konstantinos Tsatsoulis   +2 more
doaj   +1 more source

The Compressible Reynolds Lubrication Equation [PDF]

open access: yes, 1987
We give a general derivation of the Reynolds lubrication equation. We then state and sketch the proofs of some of the authors’ recent results concerning the existence, uniqueness, and qualitative behavior of solutions to the compressible Reynolds lubrication equation. Finally, we give an application of our results to a problem in elastohydrodynamics.
Chipot, M, Luskin, M
openaire   +2 more sources

On lower-dimensional models in lubrication, Part A: Common misinterpretations and incorrect usage of the Reynolds equation

open access: yes, 2020
Most of the problems in lubrication are studied within the context of Reynolds’ equation, which can be derived by writing the incompressible Navier-Stokes equation in a dimensionless form and neglecting terms which are small under the assumption that the
A. Almqvist   +3 more
semanticscholar   +1 more source

An adaptive finite element method for the inequality-constrained Reynolds equation [PDF]

open access: yesComputer Methods in Applied Mechanics and Engineering, 2017
We present a stabilized finite element method for the numerical solution of cavitation in lubrication, modeled as an inequality-constrained Reynolds equation. The cavitation model is written as a variable coefficient saddle-point problem and approximated
T. Gustafsson   +3 more
semanticscholar   +1 more source

Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods

open access: yesEngineering Applications of Computational Fluid Mechanics, 2021
On account of varying tiny cross-sectional clearance and fairly high bearing speed, the feature of lubricant gas of gas-lubricated journal bearings (GLJBs) is a complex multiscale problem.
Yulong Jiang   +5 more
doaj   +1 more source

Estimation of the Just Suspension Speed in Solid-Liquid Agitated Vessels With Various Impellers

open access: yesJournal of Chemical Engineering of Japan, 2023
The current study proposes a new model equation that takes into account the effects of impeller Reynolds number, particle Reynolds number, and particle concentration on the just suspension state.
Masao Aida, Yuya Murakami, Atsushi Shono
doaj   +1 more source

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