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Tessicini, F. (author), Li, N. (author), Leschziner, M.A. (author)The focus of the paper is on the performance of an approximate 'zonal' near- wall treatment applied within a LES strategy to the simulation of flow separating from a three-dimensional hill at high Reynolds numbers. In the zonal scheme, the state of the near-wall layer of the flow is described by parabolized Navier-Stokes equations solved on a...conference paper 2006
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Lesage, A.C. (author), Dervieux, A. (author), Allain, O. (author)In the case of incompressible flow, the level set method does not ensure mass conservation and it has to be enforced. The usual global mass conservation presents unacurracy in the case of separated phases of one fluid. In this paper, we propose an alternative local mass conservation based local volume fluxes. We apply our method to test cases...conference paper 2006
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Naber, J. (author), Koren, B. (author)In this work a numerical method for the solution of the two-dimensional Euler equations describing unsteady compressible two-fluid flow is presented. The method is based on the combination of a Runge-Kutta discontinuous Galerkin discretization of the Euler equations and a level-set method for the treatment of the two-fluid interface. The...conference paper 2006
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Perminov, V. (author)The most dangerous form of the forest fire is crown fire which causes the largest damage. Considering that, natural investigations of these problems are merely impossible, methods of mathematical modeling are urgent. Mathematical model of forest fire was based on an analysis of known experimental data and using concept and methods from reactive...conference paper 2006
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Reese, J.M. (author), Zheng, Y. (author), Lockerby, D.A. (author)In order to capture critical near-wall phenomena in gas micro- and nanoflows within conventional CFD codes, we present scaled Navier-Stokes-Fourier (NSF) constitutive relations. Our scaling is mathematically equivalent to applying an 'effective' viscosity to the original constitutive relations. An expression for this 'effective' transport...conference paper 2006
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Braza, M. (author), El Akoury, R. (author), Martinat, G. (author), Hoarau, Y. (author), Harran, G. (author), Chassaing, P. (author)This paper analyses the performances of adapted URANS and DES turbulence^modelling for high-Reynolds 2D and 3D aerodynamic flows with a pronounced periodic character. The flow configurations is the NACA0012 airfoil in pitch (experimental test-case by Mc Croskey & Mc Alistair, 1976) at Reynolds number 0.98x10^6, as well as the inherently unsteady...conference paper 2006
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Arina, R. (author), Ceresola, N. (author)A numerical simulation of the turbulent flow field of a transonic cavity and its associated far-field sound radiation, are presented. The test case is based on the experimental case M219 of QinetiQ. Two different turbulent simulations are performed, the first one is a URANS simulation with a k-w-EARSM turbulence model. while a DES turbulence...conference paper 2006
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De Maerschalck, B. (author), Gerritsma, M.I. (author)Least-squares methods for partial differential equations are based on a norm-equivalence between the error norm and the residual norm. The resulting algebraic system of equations, which is symmetric positive definite, can also be obtained by solving a weighted collocation scheme using least-squares to solve the resulting algebraic equations....conference paper 2006
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Oldenziel, G. (author), Gerritsma, M.I. (author)This paper describes the use of the Least-Squares Spectral Element Method for non-linear hyperbolic equations. The one-dimensional inviscid Burgers equation is specifically subject of investigation. A second order backward difference method is used for time stepping. The behaviour of this formulation is examined by application to a testcase...conference paper 2006
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Raisee, M. (author), Niroobakhsh, Z. (author), Jafari, A. (author)In the present paper, the effects of adding nanoscale metallic particles on the hydrodynamic and thermal characteristics of laminar liquid flow (water and ethylene glycol) through two-dimensional and axi-symmetric passages are numerically investigated. The present numerical results are obtained using a 2D finite-volume code which solves the...conference paper 2006
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Niazmand, H. (author), Sepehr, A. (author), Shahabi, P.B. (author)A numerical analysis based on a finite volume approach is employed for a 2-D axisymmetric, incompressible, laminar and transient flow in order to simulate the pulsatile blood flow in aneurysm. The unsteady nature of the blood is studied for three Womersley numbers and for three rheological models including Newtonian, Power law and Quemada. A...conference paper 2006
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- Rostand, P. (author) conference paper 2006
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Elsenaar, B. (author)Vortices behind aircraft are inherently related to the generation of lift and decay very slowly. When strong, they present a safety problem for the following aircraft and for that reason specific separation distances are recommended by ICAO (the International Civil Airline Organisation). At the same time, they limit the number of aircraft that...conference paper 2006
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Papaharilaou, Y. (author), Ekaterinaris, J.A. (author)Inflow asymmetry has been found to strongly influence the hemodynamics in arterial geometries. Flow asymmetry is commonly found within the aortic conduit just proximal of the aneurysmal expansion and is caused by the remodeling of the abdominal aorta required to accommodate the excess volume of the distended vessel. In an effort to improve the...conference paper 2006
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Van Veldhuizen, S. (author), Vuik, K. (author), Kleijn, C.R. (author)In this study various numerical schemes for simulating 2D laminar reacting gas flows, as typically found in Chemical Vapor Deposition (CVD) reactors, are proposed and compared. These CVD systems are generally modeled by means of many stiffly coupled elementary gas phase reactions between a large number of reactants and intermediate species. The...conference paper 2006
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Degroote, J. (author), Vierendeel, J. (author), Dick, E. (author)Bubbles and droplets can be simulated as a problem involving Fluid-Structure Interaction (FSI). The interface between the liquid and the gas is then conceived as a zero thickness structure. The position of the interface is determined by the equilibrium between surface tension effects and the pressure jump across the interface. Most techniques...conference paper 2006
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Vimmr, J. (author), Novak, J. (author)This paper deals with application of CFD methods contained in professional software package Fluent on a numerical solution of engineering practice problem which consists in numerical simulations of a cool air flow inside the first part of 06T-Cagliari tram passenger space. The air-conditioner exhausts a cool air into the internal passenger space...conference paper 2006
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Javierre, E. (author), Vuik, C. (author), Vermolen, F.J. (author), Segal, A. (author), Van der Zwaag, S. (author)In thermal processing of alloys, homogenization of the as-cast microstructure by annealing at such a high temperature that unwanted precipitates are fully dissolved, is required to obtain a microstructure suited to undergo heavy plastic deformation. This process is governed by Fickian diffusion and can be modelled as a Stefan problem. In binary...conference paper 2006
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Yao, J. (author), Patel, M.K. (author), Yao, Y. (author), Mason, P.J. (author)Numerical simulation has been conducted for the investigation of heat transfer in a rectangular, highaspect ratio microchannel with heat sinks, similar to an experimental study. Water at ambient temperature is used as working fluid and the heating power of 180 W is introduced via electronic cartridges in the solids. Three channel heights of 0.3...conference paper 2006
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Tang, J.H. (author), Jiang, B. (author)A numerical calculation procedure based on the least-squares finite element method (LSFEM) is employed to study the fluid flow and heat transfer in a 3-D heat exchangers with in-lined and staggered multiple-row (4 rows) tubes. In this study, the fin pitch of the heat exchanger is 8 fins per inch and the fluid flow is assumed steady,...conference paper 2006