Collection: research
(1 - 20 of 472)

Pages

document
Wendland, H. (author)
This paper gives a survey on kernel-based scattered data interpolation methods in the context of static aeroelastic computations. We describe the general procedure, address problems and solutions for large-scale data sets, for flat data sets, and for rotational information. Finally, we demonstrate the versatility of the method by showing two...
conference paper 2006
document
Jing, H. (author), Li, C. (author), Zhou, B. (author)
In this paper, some five-point finite difference schemes for steady convection-diffusion problems are presented. To begin with, we use the finite volume method (FVM) to discretize the convection-diffusion equation. After that, we present two five-point difference schemes for the approximation of the first order derivatives on faces, one of which...
conference paper 2006
document
Cebula, A. (author), Sobota, T. (author)
Local heat transfer from a cylinder in tube bank has been extensively studied. In many applications such as design of heat exchangers, detailed information regarding the circumferential and longitudinal variation of heat transfer to a cylinder is required. There are many different methods for measuring local heat transfer like techniques using...
conference paper 2006
document
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
document
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
document
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
document
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
document
Tabor, G. (author), Tame, D. (author), Pierron, F. (author), Young, P.G. (author), Watkinson, A. (author), Thompson, J. (author)
Biomedical flow problems tend to involve domains which are geometrically complex over a range of scales. Much effort has gone into developing tools for generating computational meshes automatically from medical scan data (MRI, CT), allowing the easy creation of patient-specific models of the flow domain, and hence the investigation of flow under...
conference paper 2006
document
Gonzalez, L.F. (author), Periaux, J. (author), Whitney, E.J. (author), Srinivas, K. (author)
conference paper 2006
document
Küttler, U. (author), Förster, C. (author), Wall, W.A. (author)
Many popular partitioned approaches to fluid-structure interaction (FSI) problems fail to work for an interesting subset of problems if highly deformable structures are interacting with incompressible flows. This is particularly true for coupling approaches based on Dirichlet-Neumann substructuring, both for weak and strong coupling schemes. The...
conference paper 2006
document
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
document
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
document
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
document
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
document
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
document
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
document
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
document
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
document
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
document
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
Collection: research
(1 - 20 of 472)

Pages