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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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Fureby, C. (author)
The present study concerns the application of Large Eddy Simulation (LES) and Implicit LES (ILES) to engineering flow problems. Such applications are often very complicated, involving both complex geometries and complex physics, such as turbulence, chemical reactions, phase changes and compressibility. The aim of the study is to illustrate what...
conference paper 2006
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De Wilde, J. (author), Baudrez, E. (author), Heynderickx, G. (author), Marin, G.B. (author)
Local preconditioning for Eulerian-Eulerian gas-solid flow calculations with variable gas density is investigated. The performance of simultaneous solution algorithms for low-Mach calculations is strongly related to preconditioning. The gas-solid drag source terms are at the origin of a solid volume fraction and frequency dependency of the...
conference paper 2006
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Nishikawa, N. (author), Kaita, K. (author), Ishide, T. (author)
Flow field around a projectile after thrust has been stopped and in inertia flight is studied numerically by a finite difference scheme. This study aims at clarifying the mechanism of free flight, which is generated and developed by rotation of body and gravity. Among two types of projectiles concerned a three-dimensional flow around the slender...
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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Youngs, D.L. (author)
Abstract only.
conference paper 2006
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Sarkar, S. (author), Bijl, H. (author)
In this paper the aeroelastic stability of a wind turbine rotor in the dynamic stall regime is investigated. Increased flexibility of modern turbine blades makes them more susceptible to aeroelastic instabilities. Complex oscillation modes like flap/lead-lag are of particular concern, which give way to potential structural damage, see...
conference paper 2006
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Bourgault, Y. (author)
Gas-particle flows in airways are modelled using an Eulerian approach for the particle volume fraction and velocity field. We present theoretical arguments in favor of Eulerian models for airways gas-particle flows. Simulations are done using a Finite Element Method. Result are presented on a 2-D prototype of the airways going from the mouth...
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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Sandberg, R.D. (author), Jones, L.E. (author), Sandham, N.D. (author)
This paper presents a non-reflecting boundary condition that significantly reduces the spurious pressure oscillations that are produced when vortical structures in a compressible flow cross the computational farfield boundaries. The method is based on commonly used characteristic boundary conditions. Here, incoming characteristics are ramped to...
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
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Janiga, G. (author), Gordner, A. (author), Shalaby, H. (author), Thevenin, D. (author)
The simulation of a two-dimensional laminar methane/air burner using detailed chemistry is presented in this paper. Using detailed chemistry on a growing number of grid elements rapidly leads to a large discretized equation system and to an enourmous computation time. In this case parallel computations are absolutely necessary. Thanks to...
conference paper 2006
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Bailly, C. (author), Bogey, C. (author)
This paper presents a short overview of recent developments of low-dispersive and low-dissipation finite-difference schemes as an alternative to more classical methods of applied mathematics. Needs of accurate and efficient numerical solvers in computational aeroacoustics have motivated these developements over the last two decades. Properties...
conference paper 2006
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Anca, D. (author), Turek, S. (author), Wan, D. (author)
This paper discusses numerical simulation techniques using a moving mesh approach together with the multigrid fictitious boundary method (FBM) for liquid-solid flow configurations. The flow is computed by an ALE formulation with a multigrid finite element solver (FEATFLOW), and the solid particles are allowed to move freely through the...
conference paper 2006
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Toivanen, J.I. (author), Kärkkäinen, K.T. (author)
Newton-type solution method. Detailed implementation for a model free boundary problem is presented along with the numerical results.
conference paper 2006
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Förster, C. (author), Wall, W.A. (author), Ramm, E. (author)
The artificial added mass effect inherent in sequentially staggered coupling schemes is investigated by means of a fluid-structure interaction problem. A discrete representation of a simplified added mass operator in terms of the participating coefficient matrices is given and instability conditions are evaluated for different temporal...
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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Mendes, P.J. (author), Pinto, J.F. (author), Sousa, J.M.M. (author)
The development of new medicines for inhalation requires a series of procedures including in-vitro tests using special testing devices, which simulate the human airways to assess the local deposition of drugs. Such tests require samples of the new drugs and the series of tests are costly and time-consuming. A numerical model for the two-phase...
conference paper 2006
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Elsholz, E. (author)
Abstract only.
conference paper 2006
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Tang, J.M. (author), Vuik, C. (author)
Simulating bubbly flows is a very popular topic in CFD. These bubbly flows are governed by the Navier-Stokes equations. In many popular operator splitting formulations for these equations, solving the linear system coming from the discontinuous diffusion equation takes the most computational time, despite of its elliptic origins. Sometimes these...
conference paper 2006
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