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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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Hassani, K. (author), Navidbakhsh, M. (author), Rostami, M. (author)By using CFD method, Fluent code , Aneurysm of specific locations of aorta artery have been simulated .For ascending, descending and abdominal aorta, aneurysm of different sizes and diameters are modeled. Geometrical data of aorta's sections have been extracted from physiological texts. Locations of hypothetical aneurysms are placed in the...conference paper 2006
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Wemmenhove, R. (author), Loots, G.E. (author), Veldman, A.E.P. (author)The numerical simulation of hydrodynamic wave loading on different types of offshore structures is important to predict forces on and water motion around these structures. This paper presents a numerical study of the effects of two-phase flow on an offshore structure subject to breaking waves. The numerical model, an improved Volume Of Fluid ...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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Utzmann, J. (author), Munz, C.D. (author)This paper advances the idea of a heterogeneous domain decomposition for Computational Aeroacoustics (CAA). Direct simulations of aeroacoustic problems are accelerated by sub-dividing the computational domain into smaller domains. In each of these sub-domains the equations, the discretization, the mesh and the time step may be different and are...conference paper 2006
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Paul, S.C. (author), Paul, M.C. (author), Jones, W.P. (author)In this work we investigate turbulent non-premixed combustion, including species concentrations and temperature, in a model of 3D cylindrical combustor. Gaseous propane (C3H8) and preheated air with temperature of 773K are injected through the combustor inlet. A Large Eddy Simulation (LES) technique is applied to solve the governing equations of...conference paper 2006
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Rider, W.J. (author)Implicit large eddy simulation (ILES) has provided many computer simulations with an efficient and effective model for turbulence. The capacity for ILES has been shown to arise from a broad class of numerical methods with specific properties producing non-oscillatory solutions using limiters that provide these methods with nonlinear stability....conference paper 2006
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Luppes, R. (author), Helder, J.A. (author), Veldman, A.E.P. (author)With the increasing amount of liquid on board spacecraft, liquid management and its influence on the overall spacecraft dynamics is becoming increasingly important. The influence of sloshing liquid may hamper critical manoeuvres in space, such as the docking of liquid-cargo vehicles (e.g. to ISS) or the pointing of observational satellites....conference paper 2006
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Kok, J.C. (author)A new high-order, finite-volume scheme is presented that preserves the symmetry property and the dispersion relation of the convective operator. The scheme is applied to large-eddy simulation of compressible, turbulent flow and to the solution of the linearized Euler equations for aeroacoustic applications. For large-eddy simulation, the...conference paper 2006
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Röllin, S. (author), Fichtner, W. (author)In most numerical simulations in computational science and engineering, a preconditioner is mandatory to iteratively solve large sparse linear systems. In theory, a good preconditioner clusters all eigenvalues of the iteration matrix around one. However, in practice, there may still be a few outliers. In particular, small eigenvalues deteriorate...conference paper 2006
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Jaszczur, M. (author), Portela, L.M. (author)In present work heat transfer in particle-laden wall-bounded turbulent flows has been study with the fluid-particle one way interaction approach. Direct Numerical Simulation of the flow, combined with Lagrangian particle tracking technique has been performed to study the problem. In presented configuration small solid and dense particles...conference paper 2006
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Travin, A.K. (author), Shur, M.L. (author), Spalart, P.R. (author), Strelets, M.K. (author)Adjustments are proposed of the Delayed Detached Eddy Simulation (DDES) approach to turbulence. They preserve the DDES capabilities particularly for natural DES uses, and resolve the mismatch of the logarithmic layers discovered earlier for the basic DES technique when used for Wall-Modelled Large-Eddy Simulation (WMLES) of attached flows. The...conference paper 2006
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Karimi, H. (author), Taheri, E.E. (author)There are several methods for starting a complex mechanical system, for example a liquid propellant engine. One of common methods is the use of solid propellant gas generator that is named solid propellant starter. In this method, a solid propellant motor is used for gas generating and leading it towards power generation turbine. The turbine as...conference paper 2006
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Uhlmann, M. (author)We perform a grid convergence study for a recently proposed immersed boundary method for DNS of particulate flows with interface resolution [Uhlmann, J. Comput. Phys., 209(2):448-476, 2005]. Two cases of vertical plane Poiseuille flow with suspended heavy particles (with terminal particle Reynolds number >100) are considered, in the laminar and...conference paper 2006
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Geurts, B.J. (author)We analyze the evolution of a diffusion flame in a turbulent mixing layer using large-eddy simulation. The large-eddy simulation includes Leray regularization of the convective transport and approximate inverse filtering to represent the chemical source terms. The Leray model is compared to the more conventional dynamic mixed model. The location...conference paper 2006
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Cuenot, B. (author), Boileau, M. (author), Pascaud, S. (author), Mossa, J.B. (author), Riber, E. (author), Poinsot, T. (author), Bérat, C. (author)Large Eddy Simulation (LES) is now recognized as an efficient numerical tool to predict gaseous combustion in industrial burners, and a number of examples of applications can be found in the literature. In these examples, the accuracy and the predictive capacity of LES are clearly demonstrated, even for unsteady phenomena. However most...conference paper 2006
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Gushchin, V.A. (author), Matyushin, P.V. (author)The homogeneous (1 < Re < 5000000) and stratified (0.004 < Fr < 1, 10 < Re < 1000) viscous incompressible fluid flows around a sphere have been investigated by means of the direct numerical simulation (DNS) and the visualization of the vortex structures in the wake. In case of the homogeneous fluid at 200 < Re < 1000 the detailed formation...conference paper 2006
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Moon, Y.J. (author), Bae, Y.M. (author), Cho, M.H. (author)In the present study, aerodynamic noise from a forward-facing step is numerically investigated for Reynolds number based on the step height, Reh=8,000 and flow Mach number, M=0.03. A three-dimensional flow over the forward-facing step is calculated by the incompressible large eddy simulation (LES), while its acoustic field is solved by the...conference paper 2006
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Bui, T.P. (author), Schröder, W. (author), Meinke, M. (author), Shalaby, H. (author), Thévenin, D. (author)Acoustic perturbation equations for reacting flows (APE-RF) in conjunction with direct numerical simulations (DNS) are used to investigate in detail the thermo-acoustic effects resulting from turbulent premixed flames. The basic procedure is a two-step DNS/APE-RF method, where the flow is simulated by direct numerical simulations and the...conference paper 2006