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Eca, L. (author), Hoekstra, M. (author)This paper addresses the method of manufactured solutions for RANS solvers, i.e. in the context of the calculation of incompressible turbulent flows with eddy-viscosity turbulence models. The difficulties caused by damping and/or blending functions included in the turbulence models are discussed. The need to manufacture the turbulence quantities...conference paper 2006
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Eca, L. (author), Hoekstra, M. (author)This paper presents an exercise of Code Verification with two manufactured solutions valid for 2D RANS equations supplemented either with the one-equation Spalart & Allmaras or with the two-equation BSL k-w turbulence model. When the manufactured solution is applied with the eddy viscosity frozen, second order convergence behaviour is shown....conference paper 2006
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Niedziela, D. (author), Iliev, O. (author), Latz, A. (author)In this work we present and solve a class of non--Newtonian viscoelastic fluid flow problems. Models for non-Newtonian fluids can be classified into three large groups depending on the type of the constitutive relation used: algebraic, differential and integral. The first type of models are most simple one, the last are the most physically...conference paper 2006
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Raisee, M. (author), Jafari, A. (author)This paper discusses the abilities of two different low-Reynolds-number eddy-viscosity models in resolving the complex physical features that arises in turbulent flows around a square cylinder at Re=22000. For the modeling of turbulence, the Launder & Sharma (LS) [1] and Kawamura & Kawashima (KK) [2] low-Re models have been employed. The present...conference paper 2006
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Lube, G. (author)The numerical solution of the nonstationary, incompressible Navier-Stokes model can be split into linearized auxiliary problems of Oseen type. We present in a unique way different stabilization techniques of finite element schemes on isotropic and hybrid meshes. First we describe the state-of-the-art for the classical residual-based SUPG/PSPG...conference paper 2006
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Alzaeili, J.S.L. (author), Mazaheri, K. (author)In solution of the Euler equations in the steady state conditions, the error or residual waves are blamed for the reduction of convergence rate. These waves may be damped by adding a bulk viscosity term to the momentum equations. It was done to the Euler equations previously and in this work this method has been applied to the Navier-Stokes...conference paper 2006
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- Uittenbogaard, R.E. (author), Stolker, C. (author), Goede, E.D. de (author), Kester, J.A.T.M. van (author), Jagers, H.R.A. (author), Wijbenga, J.H.A. (author) report 2005
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Hughes, T.J.R. (author), Wells, G.N. (author), Wray, A.A. (author)Energy transfers within large-eddy simulation (LES) and direct numerical simulation (DNS) grids are studied. The spectral eddy viscosity for conventional dynamic Smagorinsky and variational multiscale LES methods are compared with DNS results. Both models underestimate the DNS results for a very coarse LES, but the dynamic Smagorinsky model is...journal article 2004
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- Nguyen, Q. (author) doctoral thesis 2004
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- Van der Wal, W. (author) master thesis 2003
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Bakker, A.F. (author), Lowe, C.P. (author)In a suspension, the hydrodynamic interactions between particles can propagate by two mechanisms: relatively slowly, by the diffusion of transverse momentum, or relatively rapidly, by the propagation of sound waves. Here we describe computer simulation results for the collective and single particle dynamics of colloidal particles with the aim of...journal article 2002
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- Bijvelds, M.D.J.P. (author), Goede, E.D. de (author) report 2000
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- Verberg, R. (author) doctoral thesis 1998
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van der Ven, H. (author)In this TP a family of filters for Large Eddy Simulation with nonuniform filter widths is constructed that commute with differentiation up to any given order.report 1994
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- Meijer, D.G. (author), Hofmans, G.J.C.M. (author), Otta, A.K. (author) report 1992
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van der Vooren, J. (author), van der Wees, A.J. (author)The mathematical background is described of a method that is currently being developed at NLR to calculated wave drag in transonic potential flow. The method is a generalization and extension of Garabedian's and McFadden's idea of determining wave drag by volume-integration of the artificial viscosity. The generalization of Garabedian's and...report 1990
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Hoffmans, G.J.C.M. (author)The general purpose of this research project is to model mathematically the local scour downstream of a structure (2-D). The model has to simulate the development of the scour as a function of the time. Basically two models are necessary namely a flow model and a morphological model. The latter model has to describe the bed and suspended load...report 1988
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Hoffmans, G.J.C.M. (author)A two dimensional mathematical model DUCT, which is based on a parabolic boundary layer technique, using finite elements, is proposed to predict the flow and turbulence field in complicated geometrical conditions, where recirculating flow may occur. Numerical results of the DUCT-model are compared with k-eps-predictions as well as laboratory...report 1988
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Boerstoel, J.W. (author)A survey of numerical methods for the calculation of inviscid Euler flows is presented. This survey has been prepared for AGAKD FDP WGOT: "Test cases for steady inviscid transonic or supersonic flows". The survey is augmented by a short assessment of the usefulness of the methods. For aerodynamic applications, the existing methods are in a...report 1983
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Slot, R.E. (author)Various attempts have been made to develop a general expression for the terminal velocity of spheres in a viscous fluid (Stokes, Prandtl, Oseen, Rubey, etc.: see Bogardi, 1974 and Vanoni, 1975). All of these formulae show a lack of accuracy and/or are restrict ed to a relatively small range of Reynolds numbers. Since sieving is a time consuming...report 1983