Showing papers in "Computers & Fluids in 2008"

TL;DR: EULAG (Eulerian/semi-Lagrangian fluid solver) is an established computational model for simulating thermo-fluid flows across a wide range of scales and physical scenarios and its capabilities are demonstrated with a select subset of recent applications.

TL;DR: The Marker and Cell (MAC) method has been widely used in the field of flow visualization as mentioned in this paper. But it has not yet been applied to the analysis of surface and interfacial flows.

TL;DR: In this paper, a low-cost computational aero-acoustics approach to a slat noise problem is studied, based on the spatial convolution of spatiotemporal white noise and can reproduce target distributions of turbulence kinetic energy and length scales.

TL;DR: In this article, the Navier-Stokes equations were solved with a finite difference numerical method, which proved to be highly stable even at very high Reynolds numbers, and compared with experimental and numerical results found in the literature.

TL;DR: This paper presents several deterministic models, and presents an unified definition for the solid transport discharge, which defines a coupled system of equations that can be rewrite as a non-conservative hyperbolic system.

TL;DR: An exemplary study of the performance of commercial computational fluid dynamic (CFD) software programs when applied as engineering tool for microfluidic applications and the capability of the software programs to deal with free surface flows including surface tension and flow patterns of two fluids is studied.

TL;DR: A Cartesian grid method with adaptive mesh refinement and multigrid acceleration is presented for the compressible Navier–Stokes equations and a new multilevel concept for this application is introduced.

TL;DR: A numerical investigation of the time variation of pressure within a complete centrifugal pump was undertaken and transient flow results compared reasonably with experimental data obtained in a limited experimental survey and clearly indicated the pump locations experiencing the largest pulsation levels.

TL;DR: In this paper, the authors presented a simulation of the whole flow over a solid body covered by a porous layer and the three main models used in the literature to compute efficiently the fluid flow are given: the reduction of the porous layer to a boundary condition, the coupling of the Darcy equation with Navier-Stokes equations and the Brinkman-Navier-stokes equations or the penalisation method.

TL;DR: Only the unstructured Hexahedral mesh was found to provide overall performance similar to the structured hexahedral configuration with the advantage of a significant savings in construction time, emphasizing the importance of aligning control volume gridlines with the predominant flow direction in biofluid applications that involve long and thin internal flow domains.

TL;DR: In this article, the authors focused on numerical investigation of subsonic flow separation over a NACA0012 airfoil with a 6° angle of attack and flow separation control with vortex generators.

TL;DR: In this article, the authors used Detached-Eddy Simulation (DES) and Ffowcs Williams and Hawkings acoustic analogy formulation for the far field computation of an airfoil in the wake of a rod.

TL;DR: In this article, the problem of NO x pollution using a model boiler of an industrial boiler utilizing fuel gas was investigated using conservation equations of mass, momentum and energy, and equations representing the transport of species concentrations, turbulence, combustion and radiation modeling in addition to NO modeling equations were solved together to present temperature and NO distribution inside the radiation and convection sections of the boiler.

TL;DR: In this paper, the authors report on the potential application of LES in the calculation of turbulent isothermal two-phase flows, in the case where the large scales of each phase are resolved and small interface structures can be smaller than the mesh size.

TL;DR: In this paper, a study of steady incompressible viscoelastic and electrically conducting fluid flow and heat transfer in a parallel plate channel with stretching walls in the presence of a magnetic field applied externally is presented.

TL;DR: A solution method for the compressible Navier– Stokes equations as well as the Reynolds-averaged Navier-Stokes equations (RANS) based on a discontinuous Galerkin (DG) space discretisation based on an excellent parallelisation characteristics achieved by hiding communication latency behind computation.

TL;DR: In this paper, a 3D Direct Numerical Simulation (DNS) of a strongly deformable bubble in a spatially decaying turbulence is presented, where the complex interaction between interface and turbulence is fully resolved.

TL;DR: In this paper, a unified approach for the derivation of PML equations is presented that involves three essential steps for the PML of linear and non-linear Euler equations and numerical examples are also given that include nonreflecting boundary conditions for a ducted channel flow and mixing layer roll-up vortices.

TL;DR: The flow in the ETA is shown to be highly three-dimensional, having strong secondary flows, and flow features predicted by numerical models are compared to those from experimental flow-visualisation studies.

TL;DR: Waniewski et al. as mentioned in this paper presented a model that locates this region employing the local liquid velocity and the distance to the interface, and applied this model to simulate the flow around naval combatant DTMB 5415 and the research vessel Athena.

TL;DR: In this article, a nonlinear approximation of the convective term that preserves the symmetry and conservation properties is proposed, in particular, the energy, enstrophy (in 2D) and helicity are conserved.

TL;DR: In this article, the authors performed a direct computation of the noise radiated by a turbulent flow in a duct obstructed by a diaphragm by compressible large-eddy simulation.

TL;DR: In this paper, mixed nonlinear Kosovic, Leray and LANS-alpha subgrid scale models are compared with linear Smagorinsky and Yoshizawa large-eddy simulations for a Re = 4000 plane jet simulation.

TL;DR: In this article, a low-Reynolds-number k-e turbulence model is used in conjunction with a finite volume/finite difference discretization scheme to study the influence of turbulence and inertia on wall shear stresses.

TL;DR: In this article, the acoustic radiation of a turbulent non-premixed flame using a hybrid method is numerically simulated, which consists of an incompressible large-eddy simulation (LES) and acoustic perturbation equations (APE), which are reformulated to account for reacting flow effects (APE-RF).

TL;DR: In this article, a 19-step, 9 species detailed mechanism is used for modeling the chemical reactions and the influence of sub-grid fluctuations is accounted for by a subgrid joint probability density function (PDF) for the reactive scalars.

TL;DR: Optization of the vane shape, in the absence of manufacturing and stress constraints, led to a nearly 8% reduction in the total pressure losses compared to the baseline design by reducing the base separation.

TL;DR: In this article, the authors explored the application of a robust evolutionary algorithm (EA) for aerofoil sections and wing plan form shape design and optimisation for the improvement of aerodynamic performance and the reduction of Radar Cross Section.

TL;DR: In this paper, the acoustic field of a single stream jet at Mach number 0.9 and Reynolds number 3600 is determined via computational aeroacoustics (CAA) methods.

TL;DR: In this article, high order finite difference methods have been constructed to be strictly stable for linear hyperbolic and parabolic problems and the difference operators have been extended from the Euler to the Navier-Stokes equations for computational aeroacoustics.