Showing papers in "Computers & Fluids in 2010"

TL;DR: In this paper, the authors present a review of methods for computing inlet conditions for LES, including pre-cursor simulation and synthesis, and implement their own novel versions of these using the code OpenFOAM.

TL;DR: In this paper, a 2D computational investigation on the dynamic stall phenomenon associated with unsteady oscillations around the NACA0012 airfoil at low Reynolds number is presented, where two sets of oscillating patterns with different frequencies, mean oscillating angles and amplitudes are numerically simulated using Computational Fluid Dynamics.

TL;DR: A new unified family of arbitrary high order accurate explicit one-step finite volume and discontinuous Galerkin schemes on unstructured triangular and tetrahedral meshes for the solution of the compressible Navier–Stokes equations is proposed.

TL;DR: The results of validation of an open source Direct Simulation Monte Carlo (DSMC) code for general application to rarefied gas flows is presented, showing very good agreement with data provided by both analytical solutions and other contemporary DSMC codes.

TL;DR: The historical development of these approaches are examined, the theoretical background of each major method and the associated numerical techniques required to make them practical in an engineering setting are described, and what is considered to be the state-of-the-art in these methods are described.

TL;DR: In this paper, the authors apply the immersed-boundary method to simulate 2-and 3-dimensional viscous incompressible flows interacting with moving solid boundaries using direct-momentum forcing on a Cartesian grid by combining "solid-body forcing" at solid nodes and interpolation on neighboring fluid nodes.

TL;DR: In this paper, the authors present isothermal CFD simulations of coupled urban wind flow and indoor natural ventilation to assess the influence of wind direction and urban surroundings on the air change rate per hour (ACH) of a large semi-enclosed stadium.

TL;DR: The excellent freestream and vortex preservation properties of WCNS when used with the numerical technique, compared with those of WENO, are shown for the first time.

TL;DR: In this paper, the authors performed multiscale simulations of primary atomization using a volume-of-fluid (VOF) algorithm coupled with a two-way coupling Lagrangian particle tracking model to simulate the motion and influence of smallest droplets.

TL;DR: In this article, the dynamics of a single rising gas bubble is studied using a Lattice Boltzmann Method (LBM) based on the Cahn-Hilliard diffuse interface approach.

TL;DR: In this article, an investigation on the unsteady flow behavior near the tongue region of a single-suction volute-type centrifugal pump with a specific speed of 0.47 was presented, which was simulated by means of a commercial CFD software that solved the Navier-Stokes equations for 3D-URANS.

TL;DR: In this article, both normal and oblique shocks interactions with turbulence are considered using Large-Eddy Simulation (LES) with a new localized subgrid closure approach, which combines a hybrid numerical scheme that switches automatically and locally between a shock-capturing scheme and a low-dissipation high-order central scheme.

TL;DR: In this article, a hybrid spectral-homotopy analysis technique developed by Motsa et al. was compared through the solution of the nonlinear equation for the MHD Jeffery-Hamel problem.

TL;DR: In this paper, a detailed analysis of the airwake flow topology at headwind and Green 45° conditions highlights the dominant flow features over the flight deck and significant differences exist between the two wind-over-deck (WOD) angles.

TL;DR: The paper focuses in particular on the sloshing phenomenon and on the numerical approaches used to predict theSloshing wave amplitude, frequency, pressure exerted on the walls and the effect of sloshed on the stability in the container environment.

TL;DR: In this paper, an innovative approach which combines high-order schemes and a dual domain decomposition method is presented and is applied to DNS of multiscale-generated turbulent flows by a fractal grid.

TL;DR: In this article, a lattice Boltzmann method based on the free-energy model is developed to simulate the behavior of bubble-bubble interaction while rising in the fluid.

TL;DR: In this paper, the non-Darcy effect on incompressible flows through disordered porous media is investigated numerically and a general correlation is proposed to include the nonDarcy effects.

TL;DR: In this paper, a finite difference/front-tracking method is developed for computational modeling of impact and spreading of a viscous droplet on dry solid walls, where the contact angle is specified dynamically using the empirical correlation given by Kistler (1993).

TL;DR: In this paper, an unstructured flow solver is used in the simulations at various Reynolds numbers (from 26,000 to 1,850,000 based on the chord length), two different angles of attack (0° and 4°) and low Mach number (0.1).

TL;DR: In this article, two versions of a second-order characteristic-based split scheme are developed in the framework of incremental projection method for the solution of incompressible flow problem, and numerical results show that, at sufficiently small and large s, the range of which is different for different α, the flow interference is dominated by proximity and wake effect, respectively.

TL;DR: In this paper, the authors investigated the aerodynamic response of a freight train subjected to a crosswind at 90° yaw angle using large-eddy simulation (LES) and found that the flow moves in the gaps between the containers and under the wagon with high speed resulting in a much more complex flow topology in the wake of the wagon.

TL;DR: In this article, the effects of numerical viscosity, subgrid scale (SGS) and grid resolution are investigated in LES and VMS-LES simulations of the flow around a circular cylinder at Re = 3900 on unstructured grids.

TL;DR: In this paper, the feasibility of using a detached eddy simulation (DES) SST model, which is a hybrid URANS/LES model, to predict cycle to cycle variations is investigated.

TL;DR: In this paper, the authors proposed a new system of compact discrete filters based on a seven-point stencil and pentadiagonal matrix formulation which can be readjusted with ease for many different high-order finite difference schemes.

TL;DR: Improvements introduced in the treatment of the spatial discretization reduce significantly the difficulty of implementation of the code, and facilitate the use of high resolutions.

TL;DR: The code CFDShip-Iowa version 4 and the overset assembly code Suggar were modified to carry out some large scale simulations of free surface ship hydrodynamics, focused on reducing the memory requirement and optimizing the per-processor and parallel performance at the implementation and algorithmic levels.

TL;DR: In this article, a systematic study for the flow around a row of five square cylinders placed in a side-by-side arrangement and normal to the oncoming flow at a Reynolds number of 150 is carried out through the numerical solution of the two-dimensional unsteady incompressible Navier-Stokes equations.

TL;DR: It is shown that it is possible to couple passive and active control techniques to improve the flow control and a drag reduction of 30% is achieved, almost corresponding to the goal of automotive industry.

TL;DR: In this paper, the effects of effective angle of attack (AOA) profile on an oscillating foil thrust performance were studied using a computational method. And the authors found that the degradation of thrust force and efficiency with sinusoidal pitching/plunging oscillation, at higher St, is effectively alleviated or removed when the AOA is imposed as a cosine profile.