Showing papers in "Computers & Fluids in 2004"

TL;DR: In this paper, a method to perform large-eddy simulations around complex boundaries on fixed Cartesian grids is presented, which is applicable to boundaries of arbitrary shape, does not involve special treatments, and allows the accurate imposition of the desired boundary conditions.

TL;DR: In this article, the authors compared partitioned and monolithic solution procedures for numerical simulation of fluid-structure interactions, and the role of structural prediction for a partitioned method is discussed.

TL;DR: In this paper, a computational fluid dynamics (CFD)-based erosion prediction model and its application to oilfield geometries specifically elbows and plugged tees is presented, which consists of three major components: flow simulation, particle tracking, and erosion calculation.

TL;DR: In this paper, a zonal grid algorithm for direct numerical simulation (DNS) of incompressible turbulent flows within a Finite-Volume framework is presented, which uses fully coupled embedded grids and a conservative treatment of the grid-interface variables.

TL;DR: In this article, three-dimensional flow calculations of the intake and compression stroke of a four-valve direct-injection Diesel engine have been carried out with different combustion chambers.

TL;DR: An implicit algorithm for solving the discrete adjoint system based on an unstructured-grid discretization of the Navier–Stokes equations is presented, constructed such that an adjoint solution exactly dual to a direct differentiation approach is recovered at each time step, yielding a convergence rate which is asymptotically equivalent to that of the primal system.

TL;DR: This paper proposes to modify the fluxes computed by Godunov type schemes by solving a preconditioned Riemann problem instead of the original one and shows that this strategy allows to recover a correct scaling of the pressure fluctuations.

TL;DR: A block lower–upper symmetric Gauss–Seidel (BLU-SGS) implicit dual time-stepping method is developed for moving body problems with hybrid dynamic grids to simulate flows over complex configurations.

TL;DR: An aerodynamic shape optimization tool for complex industrial flows is developed, based on an hybrid process that couples a stochastic genetic algorithm and a deterministic BFGS hillclimbing method to optimize the rear of a simplified car shape.

TL;DR: In this article, the principle of lattice-Boltzmann techniques is recalled and some of the difficulties to simulate convective flows are discussed, and a hybrid scheme with lattice Boltzmann for fluid velocity variables and finite-difference for the temperature is proposed.

TL;DR: In this article, an effective method for one-way coupled Eulerian-Lagrangian simulations of spherical micro-size particles, including particle-wall interactions and quantification of near-wall stasis at possibly elevated concentrations, is described.

TL;DR: In this paper, an adaptative augmented Lagrangian method is proposed to solve the predictor solution, satisfying at the same time the conservation equations as well as the incompressibility constraint.

TL;DR: In this article, a mesh-free finite-difference scheme for solving incompressible viscous flows is presented based on the use of a weighted least-square approximation procedure together with a Taylor series expansion of the unknown function.

TL;DR: In this paper, a zonal k-l-based large eddy simulation (LES) approach is presented, where the interface location for the differing models is either explicitly specified, or, based on length scale compatibility, allowed to naturally locate.

TL;DR: In this article, a numerical scheme applying to unstructured tetrahedrizations, that is conservative, upwind of MUSCL type and vertex centered, is presented. And the new scheme is combined with two LES models, derived from the Smagorinsky model and the dynamic Germano model.

TL;DR: In this article, a numerical method based on the Fokker-Planck equation is applied to the simulation of a dilute solution of polymer modelled by two-dimensional FENE dumbbells.

TL;DR: In this article, a large eddy simulation (LES) was used to verify the experimental results of Nakagawa et al. [Exp. Fluids 27(3) (1999) 284] by LES and identify the features of flows past a square cylinder confined in a channel in comparison with the conventional one in an infinite domain.

TL;DR: In this article, the GMRES iterative method is used to solve the Schur complement system for the augmented variables that are only defined on the interface, and the augmented approach also rescales the Stokes equations in such a way that a fast Poisson solver can be used in each iteration.

TL;DR: In this paper, a computational model for the prediction of isothermal annular two-phase flow in vertical and horizontal intersecting pipes is described, and the results of its application to predict phase separation in a horizontal T-junction are presented.

TL;DR: In this article, the authors considered the Taylor-Couette flow between two concentric cylinders with the inner one rotating and with an imposed pressure-driven axial flow using numerical simulation and showed that the shift-and-reflect symmetry holds for the remaining velocity field after subtracting the annular Poiseuille flow.

TL;DR: The results demonstrated that the approach combines high accuracy of optimization and efficient handling of various non-linear constraints with high computational efficiency and robustness and allowed the method to be used in a demanding engineering environment.

TL;DR: This work presents a novel approach to compute aerodynamically generated sound using the acoustic analogy, which is valid for sources in sub- and supersonic motion, free of mathematical singularities, and is especially suitable for using CFD data, since no interpolation of the source data is required.

TL;DR: In this article, a numerical study of fluid mechanics and heat transfer in a scraped surface heat exchanger with non-Newtonian power law fluids is undertaken, and numerical results are generated for 2D steady-state conditions using finite element methods.

TL;DR: The suitability of various open boundary conditions is evaluated for direct numerical simulations of three-dimensional, incompressible, spatially and temporally evolving, swirling laminar jets in domains that extend to infinity in the downstream and radial direction as discussed by the authors.

TL;DR: These schemes are extended to the one-dimensional bed-load sediment transport equations and the specific numerical approximations for the nonconservative product give excellent results, as it can be seen from the numerical tests.

TL;DR: In this article, a numerical study of unsteady natural convection flow during freezing of water in a circular enclosure is presented, where a model for phase change is based on apparent capacity method formulation and the governing equations are discretized on a fixed grid by means of finite element method.

TL;DR: In this paper, an approximately factored compactdifference-based method, up to sixth-order accurate in space, was developed to obtain the electric field in magnetogasdynamic (MGD) interactions.

TL;DR: In this article, the authors derived the discrete Navier-Stokes equations in terms of B-coefficients of bivariate splines over a triangulation, with curved boundary edges, of any given domain.

TL;DR: In this paper, the authors considered the flow of a viscoelastic fluid through an undulating tube and modelled the fluid using the UCM constitutive equation, and solved the governing set of equations using a time-splitting technique.

TL;DR: One of the main findings is that careful selection of numerical methods and implementation techniques can lead to accurate and very efficient codes, where the geometric complexity does not lead to algorithmic or numerical complexity.