Showing papers in "Computers & Fluids in 1995"

TL;DR: In this article, a new k -ϵ eddy viscosity model, which consists of a new model dissipation rate equation and a new realizable eddy viscous formulation, is proposed.

TL;DR: In this article, the accuracy and efficiency of two types of subiterations in both explicit and implicit Navier-Stokes codes are explored for unsteady laminar circular-cylinder flow and unsteby turbulent flow over an 18-percent-thick circular-arc (biconvex) airfoil.

TL;DR: This work numerically demonstrates convergence of the BGK schemes to the incompressible Navier-Stokes equations and quantifies the errors associated with compressibility and discretization effects.

TL;DR: In this article, numerical simulations of spatially developing, three-dimensional jets issued from circular and non-circular nozzles of identical equivalent diameters are presented, showing that large scale coherent structures are formed in both cornered and noncornered jets.

TL;DR: In this article, the Navier Stokes numerical scheme was used to calculate unsteady flow fields of a two-dimensional oscillating airfoil using an implicit, finite-difference, Navier-Stokes numerical approach.

TL;DR: In this paper, a two-phase treatment for the Navier-Stokes equations is proposed to account for cavitated regions, which is accomplished through the addition of a pseudo-density which varies in magnitude between the vapor and liquid densities.

TL;DR: Agglomeration multigrid, which has been demonstrated as an efficient and automatic technique for the solution of the Euler equations on unstructured meshes, is extended to viscous turbulent flows and employed to solve the Reynolds-averaged Navier-Stokes equations for aerodynamic flows.

TL;DR: In this paper, a simple shear flow past a one-dimensional array of two-dimensional viscous drops with constant surface tension at small and moderate Reynolds numbers up to Re = 100 is considered in a Couette flow device.

TL;DR: In this paper, a 3D flow field induced by two trains passing by each other inside a tunnel is studied based on the numerical simulation of the three-dimensional compressible Euler/Navier-Stokes equations formulated in the finite difference approximation.

TL;DR: In this paper, a finite volume solution method for the two-dimensional Navier-Stokes equations and temperature equation with 4th order discretization on cartesian grids is presented, which uses colocated variable arrangement and the SIMPLE-kind of velocity-pressure coupling.

TL;DR: In this article, a nonlinear streamline quadrature upwinding noniterative finite element method has been employed for flow analysis and velocity, pressure and stress fields for various peristaltic flows are obtained.

TL;DR: In this paper, the use of characteristic boundary conditions for the Navier-Stokes equations with constant coefficients matrices is analyzed and new boundary conditions of characteristic type that yield fast convergence to steady state, a strongly well posed continuous problem and a strongly stable semi-discrete problem are derived.

TL;DR: In this article, a multigrid solution strategy is presented for the efficient and economic solution of highly recirculating incompressible laminar flows, in particular the inertia terms, and the enhancement of the overall stability and efficiency of the method through the use of defect correction.

TL;DR: In this article, the incompressible Newtonian flows through two-and three-dimensional expansions are considered, and steady-state solutions are sought for both small and large expansion ratios.

TL;DR: In this paper, the performance of three different turbulence closure models in the prediction of turbulent swirling flows is presented: a nonlinear k -ϵ Model (NKEM), the Reynolds Stress Transport Model (RSTM), and the Algebraic Stress Model (ASTM).

TL;DR: In this paper, the authors combined the combined use of hyperbolic and algebraic methods in easing the task of surface domain decomposition and surface grid generation for the Chimera overset grid approach.

TL;DR: In this paper, a Lamb-type vortex unsteady movement in a free stream is compared to the numerical solutions obtained from different numerical schemes to assess their temporal accuracies and demonstrate the needs and provide a means for quantification of both distribution and absolute values of numerical error.

TL;DR: Main aim is to investigate whether pattern selection occurs through the occurrence of saddle node bifurcations creating intervals of unique steady states, which turns out that these intervals do not exist; multiple stable states continue to exist at large aspect ratio over a large range of Rayleigh numbers.

TL;DR: In this paper, a numerical method for solving the Navier-Stokes equations is presented based on a time-splitting scheme and introduces an hybrid Fourier pseudo-spectral and Hermitian finite difference scheme in space along with an efficient projection method for the pressure-velocity coupling.

TL;DR: An invariant formulation and finite volume discretization of the standard k-ϵ turbulence model in general curvilinear co-ordinates and a proof that k and ϵ are non-negative is given.

TL;DR: In this article, an asymptotic solution for the static laminar flow due to a Type IV shock-on-shock interaction at Mach 8 is examined with a flux-split scheme based on a modified Steger-Warming method.

TL;DR: In this paper, a numerical study for dilute to semi-concentrated fiber suspension flows in a Newtonian solvent through various contraction and expansion geometries is presented, and a time-stepping Taylor-Galerkin/pressure correction numerical scheme is employed to obtain steady solutions.

TL;DR: In this article, the authors compared the performance of the full Newton nonlinear iteration using a Jacobian based on a high order discretization with a widely used technique which uses a first order Jacobian.

TL;DR: In this article, the authors argue the merits of adopting general and fundamentally sound practices for modelling turbulence transport in complex aerodynamic flows and highlight the use of second-moment closure in separated conditions.

TL;DR: An adaptive local grid refinement (ALGR) algorithm based on exact peak capture and oscillation free scheme (EPCOF) is developed to solve transport equations as mentioned in this paper, which consists of the Lagrangian-Eulerian decoupling of advection-diffusion transport, backward-node tracking, forward node tracking, and adaptive local grids refinement based on the EPCOF.

TL;DR: In this article, an extension of the Keller box scheme designed to facilitate the solution of differential systems involving integral operators which naturally arise in multiphase flows is introduced to handle the multilayer and integral operator features of such problems.

TL;DR: In this article, a second-moment Reynolds Stress Transport Model (RSTM) was used for computing transonic flow in a plane channel with a bump, and an explicit time-marching Runge-Kutta code is used for the mean flow equations, the convecting terms are discretized using a third-order scheme (QUICK), and no explicit dissipation is added.

TL;DR: The technique has been applied to compute simple and complex hypersonic flows, showing that faster convergence is achieved by means of upwind prolongation operators, however, for supersonic flows the technique shows no advantage over the standard approach.

TL;DR: In this article, the mass-average Navier-Stokes equations were solved in conjunction with the k-ϵ turbulence model of Jones and Launder for axisymmetric afterbodies.

TL;DR: In this article, a finite difference method was proposed for solving incompressible flow problems in two dimensions, where the boundary values of vorticity, including those at singular points, are not required for computing the flow field inside the domain.