Journal ArticleDOI
Semi‐implicit and explicit finite element schemes for coupled fluid/thermal problems
TLDR
In this paper, a comparative analysis of two purely explicit and one semi-implicit finite element methods used for incompressible flow computation is presented, where the fundamental concepts and characteristics of the formulations and the solution methodology used are described in technical detail.Abstract:
A comparative investigation, based on a series of numerical tests, of two purely explicit and one semi-implicit finite element methods used for incompressible flow computation is presented. The ‘segregated’ approach is followed and the equations of motion are considered sequentially. The fundamental concepts and characteristics of the formulations and the solution methodology used are described in technical detail. Various modifications to Chorin's projection algorithm are investigated, particularly with respect to their effects on stability and accuracy. The stability of the semi-implicit method is shown to be less restrictive when compared to the explicit methods as the Reynolds number increases. At large time steps the artificial viscosity is also reduced and higher accuracy is obtained. The performance of the methods discussed in this paper is illustrated by the numerical solutions obtained for the cavity flow and flow past a rearward-facing step problems at high Reynolds numbers, and free convection flow problem at high Rayleigh numbers. It is shown that the semi-implicit method needs fewer iterations than the explicit methods, and the accuracy of the present methods is guaranteed by comparison with the existing methods.read more
Citations
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Journal ArticleDOI
Natural convective heat transfer in a fluid saturated variable porosity medium
TL;DR: In this article, a generalised non-Darcian porous medium model for natural convective flow has been developed taking into account linear and non-linear matrix drag components as well as the inertial and viscous forces within the fluid.
Journal ArticleDOI
A new benchmark quality solution for the buoyancy-driven cavity by discrete singular convolution
TL;DR: In this article, a high-accuracy discrete singular convolution (DSC) approach is proposed for the numerical simulation of coupled convective heat transfer problems, where the problem of a buoyancy-driven cavity is solved by two completely independent numerical procedures.
Journal ArticleDOI
An efficient artificial compressibility (AC) scheme based on the characteristic based split (CBS) method for incompressible flows
TL;DR: In this article, an artificial compressibility scheme using the finite element method is introduced, which takes advantage of good features from both velocity correction and standard artificial compressible schemes and works on a variety of grids and gives results for a wide range of Reynold's numbers.
Journal ArticleDOI
Large-scale computation of incompressible viscous flow by least-squares finite element method
TL;DR: In this article, the least square finite element method (LSFEM) based on the velocity-pressure-vorticity formulation is applied to large-scale/three-dimensional steady incompressible Navier-Stokes problems.
Journal ArticleDOI
A full-scale numerical study of interfacial instabilities in thin-film flows
TL;DR: In this article, a finite element method is used with an arbitrary Lagrangian-Eulerian formulation to handle the moving boundary problem of a two-dimensional thin draining film and the phase boundaries for this quasi-periodic regime have been determined through extensive numerical parametric search.
References
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Journal ArticleDOI
Numerical solution of the Navier-Stokes equations
TL;DR: In this paper, a finite-difference method for solving the time-dependent Navier-Stokes equations for an incompressible fluid is introduced, which is equally applicable to problems in two and three space dimensions.
Journal ArticleDOI
High-Re solutions for incompressible flow using the Navier-Stokes equations and a multigrid method
U Ghia,K.N Ghia,C. T. Shin +2 more
TL;DR: The vorticity-stream function formulation of the two-dimensional incompressible NavierStokes equations is used to study the effectiveness of the coupled strongly implicit multigrid (CSI-MG) method in the determination of high-Re fine-mesh flow solutions.
Journal ArticleDOI
Application of a Fractional-Step Method to Incompressible Navier-Stokes Equations
John Kim,Parviz Moin +1 more
TL;DR: In this paper, a numerical method for computing three-dimensional, time-dependent incompressible flows is presented based on a fractional-step, or time-splitting, scheme in conjunction with the approximate-factorization technique.
Journal ArticleDOI
Natural convection of air in a square cavity: A bench mark numerical solution
TL;DR: In this paper, the authors used mesh refnement and extrapolation to obtain an accurate solution of the equations describing two-dimensional natural convection in a square cavity with differentially heated side walls.
Journal ArticleDOI
Numerical Methods for Nonlinear Variational Problems
Roland Glowinski,J. T. Oden +1 more
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