Thermohydrodynamic Analysis for a Hydrodynamic Journal Bearing Groove

2005 ◽  
Vol 219 (4) ◽  
pp. 263-274 ◽  
Author(s):  
L Jeddi ◽  
M El Khlifi ◽  
D Bonneau
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Journal Bearing ◽  
Numerical Procedure ◽  
Navier Stokes ◽  
Element Formulation ◽  
Lubricant Flow ◽  
Hydrodynamic Journal Bearing ◽  
Feeding Pressure ◽  
Energy Equations

A numerical procedure is developed for the analysis of thermohydrodynamic behaviour of the hydrodynamic (HD) flow in the groove of a journal bearing. The Navier-Stokes and energy equations are written in terms of the primitive variables u, v, p, and T and solved simultaneously using the incremental load method and the finite element formulation. The numerical model is applied to the analysis of the velocities, the pressure, and the temperature patterns that characterize the lubricant flow in the HD groove. The effects of the runner velocity and the feeding pressure are investigated.

Influence of Thermal and Elastic Deformations on Connecting-Rod Big End Bearing Lubrication Under Dynamic Loading

1999 ◽  
Vol 122 (1) ◽  
pp. 181-191 ◽  
Author(s):  
S. Piffeteau ◽  
D. Souchet ◽  
D. Bonneau
Keyword(s):  
Finite Element ◽  
Dynamic Loading ◽  
Numerical Procedure ◽  
Element Formulation ◽  
Heat Transfer Equation ◽  
Connecting Rod ◽  
Elastic Deformations ◽  
Newton Raphson ◽  
Energy Equations ◽  
Raphson Method

A numerical procedure is developed for the analysis of transient thermoelastohydrodynamic (TEHD) behavior of connecting-rod bearings under dynamic loading. The Reynolds and energy equations in the film and heat transfer equation in the solids are all solved using the Newton-Raphson method and the finite element formulation. The finite element meshes of the three domains are interconnected, and so the heat flux continuity conditions become implicit. As a consequence, the study of complicated structures, such as actual connecting-rod bearings, can be handled and boundary conditions can easily be changed. [S0742-4787(00)02301-8]

scholarly journals Modeling of natural convection of a concentrated solar power receiver absorber tube in interaction with neighbouring absorbers

2021 ◽  
pp. 53-61
Author(s):  
Olanrewaju Miracle Oyewola ◽  
Niyi Ezekiel Olukayode ◽  
Olusegun Olufemi Ajide
Keyword(s):  
Nusselt Number ◽  
Natural Convection ◽  
Average Nusselt Number ◽  
Solar Power ◽  
Renewable Energy Sources ◽  
Navier Stokes ◽  
Element Formulation ◽  
Concentrated Solar Power ◽  
Set Up ◽  
Energy Equations

Concentrated Solar Power (CSP) technology stands out among other renewable energy sources not only because of its ability to address current energy security and environmental challenges but because its energy can be stored for future use. To ensure optimum performance in this system, the heat losses need to be evaluated for better design. This work studies the natural convection in the receiver absorber tube of a CSP plant taking into consideration the influence of neighboring absorbers. A 2-Dimensional model was adopted in this study. Initially, a single absorber tube was considered, it was subjected to heat flux at the top wall, the bottom wall was insulated and a temperature differential was set up at the lateral walls. The dimensionless forms of Navier-Stokes and energy equations were solved using the finite element formulation of COMSOL Multiphysics software. The result obtained for a single absorber tube showed good agreement with existing research works. This validated model was then extended to multiple absorber tubes (two to six absorber tubes). On the basis of the study, there is an observed increase in the intensity and dominance of convective heat transfer with an increase in the number of absorber tubes. This is occasioned by an increase in the average surface temperature as well as average Nusselt number. For the Rayleigh number of 104, 105 and 106, the average Nusselt number increases with the number of absorber tubes by 13.87 %, 6.26 %, and 1.55 %, respectively. This increment suggests effect of thermal interactions among the neighboring absorber tubes

Étude de la réouverture de la lagune du Havre aux Basques. II. Modélisation numérique du processus de mélange des eaux

1995 ◽  
Vol 22 (1) ◽  
pp. 72-79
Author(s):  
A. Khelifa ◽  
Y. Ouellet ◽  
J.-L. Robert
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Transport Model ◽  
Numerical Study ◽  
Time Discretization ◽  
Element Formulation ◽  
Modélisation Numérique ◽  
Advection Diffusion ◽  
Space Discretization ◽  
Triangular Elements

This paper, the second of a series, presents the results of a numerical study of the advection–diffusion water mixing process between the Havre aux Basques lagoon and the Gulf of St. Lawrence, after the proposed reopening of the lagoon. In this study, the reopening scheme of the inlet, which has been closed in 1957, is analyzed by using a horizontal two-dimensional numerical model. The transport model is based on the Douglas–Wang finite element formulation for a space discretization. The approximation is quadratic, using six-node triangular elements. The semi-implicit Crank–Nicholson scheme is used for a time discretization. The results show that after reopening the lagoon, mixing may take between 5 and 22 days for a diffusion coefficient considered constant throughout the region and varying from 5 to 500 m2/s. Key words: lagoon, Havre aux Basques, advection–diffusion, mixing, numerical model, finite element, Douglas–Wang.

A New Finite Volume Element Formulation for the Non-Stationary Navier-Stokes Equations

2014 ◽  
Vol 6 (5) ◽  
pp. 615-636 ◽  
Author(s):  
Zhendong Luo
Keyword(s):  
Finite Element ◽  
Finite Volume ◽  
Stokes Equations ◽  
Volume Element ◽  
Navier Stokes ◽  
Element Formulation ◽  
Navier Stokes Equations ◽  
Fully Discrete ◽  
Finite Volume Element ◽  
Stationary Navier Stokes Equations

AbstractA semi-discrete scheme about time for the non-stationary Navier-Stokes equations is presented firstly, then a new fully discrete finite volume element (FVE) formulation based on macroelement is directly established from the semi-discrete scheme about time. And the error estimates for the fully discrete FVE solutions are derived by means of the technique of the standard finite element method. It is shown by numerical experiments that the numerical results are consistent with theoretical conclusions. Moreover, it is shown that the FVE method is feasible and efficient for finding the numerical solutions of the non-stationary Navier-Stokes equations and it is one of the most effective numerical methods among the FVE formulation, the finite element formulation, and the finite difference scheme.

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