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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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Ahadi, A. (author)A binary mixture model for soils has been formulated and analyzed. In the model one of the constituents is soil and the other constituent an incompressible liquid. The effects of water are included by formulating a mixture model is formulated as an extension of an existing non-associated elasto-plastic material model for granular materials. This...conference paper 2006
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Daumas, L. (author), Dinh, Q.V. (author), Kleinveld, S. (author), Rogé, G. (author)Preliminary results on shape optimization of a wing-body configuration aiming at reducing sonic boom overpressure will be discussed. The optimization process uses a CAD modeler and an Euler CFD code with adjoint. Thickness, scale, twist and camber at section level were used to obtain gains in ground pressure signature.conference paper 2006
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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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Cnossen, J.M. (author), Bijl, H. (author), Gerritsma, M.I. (author), Koren, B. (author)For goal-oriented model adaptation a model-error estimator is required to drive the adaptation process. In recent years publications have appeared on the dual-weighted residual (DWR) method in the application of model-error estimation in output functionals. In this paper we study the application of the DWR method for convection-diffusion...conference paper 2006
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Jeong, S. (author), Minemura, Y. (author), Obayashi, S. (author)Diesel engine combustion chamber which reduces exhaust emission has been designed using CFD analysis and optimization techniques. In order to save computational time for design, the Kriging model, one of the response surface models, is adopted here. For the robust exploration, both the estimated function value of the model and its uncertainty...conference paper 2006
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Christakis, N. (author), Chapelle, P. (author), Patel, M.K. (author), Cross, M. (author)Many industrial processes involve particulates with materials ranging from pharmaceuticals, ceramics, cosmetics and foods. Common to all these particulate processes is the discharge of granular material from bins/hoppers in either mass flow mode (i.e. all material regions in the domain are in motion) or core flow mode (i.e. there is a flowing...conference paper 2006
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Wackers, J. (author), Koren, B. (author)A surface capturing method is developed for steady water-air flow with gravity. Second-order accuracy is obtained with flux limiting and turbulence is modeled with Menter's model. The model is solved efficiently with a combination of multigrid and defect correction. Results for two test cases confirm the efficiency and accuracy of the method.conference paper 2006
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Meeks, E. (author), Chou, C.P. (author)In the past decade, the computational fluid dynamics (CFD) community has put increasing attention on incorporating complex chemistry and physics into CFD simulations. However, for many practicing engineers today there is still much lacking in the effectiveness of reacting-flow simulation. Particularly in the area of combustion, the results can...conference paper 2006
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Koutlas, G.N. (author)The purpose of the present study is to explore and validate the efficiency and accuracy of the predictive capability of CFD models for fully developed natural fires in large compartments. The FDS CFD software was used to simulate three large-scale fire tests. The fire tests (nine in total) had been carried out in 1993 at Cardington UK, in...conference paper 2006
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Winckelmans, G. (author), Cocle, R. (author), Dufresne, L. (author), Capart, R. (author), Bricteux, L. (author), Daeninck, G. (author), Lonfils, T. (author), Duponcheel, M. (author), Desenfans, O. (author), Georges, L. (author)This paper aims at presenting DNS and LES as applied to the simulation of vortex wakes: in laboratory conditions (moderate to medium Reynolds numbers) and up to real aircraft conditions (high to very high Reynolds numbers). Only incompressible flows are considered. DNS and LES are able to capture complex 3-D physics provided one uses high...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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Gejadze, I.Y. (author), Monnier, J. (author)In the context of river hydraulics, we develop the idea of a richer local zoom model superposed to a given global model. The local zoom model (2D shallow water equations in flooded parts) describes additional physical phenomena which are not represented by the basic global model (1D shallow-water equations with storage area). The weak coupling...conference paper 2006
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Tomé, M.F. (author), Castelo, A. (author), Ferreira, V.G. (author)This work presents a numerical method for solving three-dimensional viscoelastic free surface flows governed by the Oldroyd-B constitutive equation. It is an extension to three dimensions of the technique introduced by Tomé et al. [1] (see also [5]). The governing equations are solved by a finite difference method on a 3D-staggered grid. Marker...conference paper 2006
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Kiselev, A.B. (author), Kokoreva, A.V. (author), Nikitin, V.F. (author), Smirnov, N.N. (author)A model of transient single-lane traffic flows is proposed, taking into account the basic components used to control road traffic (traffic lights and sleeping policemen), which is radically different from those traditionally considered in continuum mechanics. The model takes into account the main property of traffic flows, namely, the property...conference paper 2006
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Van Doren, J. (author), Markovinovic, R. (author), Jansen, J.D. (author)During the design of development concepts for the exploitation of oil and gas reservoirs, frequent use is made of numerical simulation of the flow of multi-phase fluids through porous rock. Recently, increased attention has been paid to systematic optimization of well positions and operating parameters (rates, pressures) over the life of the...conference paper 2006
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Obayashi, S. (author)Multi-Objective Design Exploration (MODE) and its application are presented. MODE reveals the structure of the design space from the trade-off information and visualizes it as a panorama for Decision Maker. As an optimizer for MODE, Efficient Global Optimization (EGO) based on the Kriging model has been extended to Multi-EGO to solve multi...conference paper 2006
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De Wilde, J. (author)To account for meso-scale phenomena in coarse grid simulations, correlation terms appearing in the filtered gas-solid flow equations have to be modeled. Filtered models for the gas-solid momentum transfer are focused on. The latter consists of the drag force on the one hand and the distribution of the gas phase pressure gradient over the phases...conference paper 2006
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Van Doren, J. (author), Markovinovic, R. (author), Jansen, J.D. (author)During the design of development concepts for the exploitation of oil and gas reservoirs, frequent use is made of numerical simulation of the flow of multi-phase fluids through porous rock. Recently, increased attention has been paid to systematic optimization of well positions and operating parameters (rates, pressures) over the life of the...conference paper 2006
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Weiland, S. (author), Van Belzen, F. (author)This paper considers the problem of optimal rank approximation of multilinear functions. A new notion of singular values is introduced for an arbitrary tensor and it is shown how optimal lower rank approximations of a tensor can be inferred from these singular values, without resorting to orthogonal tensor decompositions. The results in this...conference paper 2006