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Veldman, A.E.P. (author)Op het NLR bestaat de behoefte om een rekenmethode te ontwikkelen waarmee sterke interactie tussen een grenslaag en een niet-viskeuze buitenstroming kan worden bestudeerd. Dit memorandum geeft, aan de hand van een analyse van interactie verschijnselen, een overzicht van de eisen waaraan een dergelijk programma moet voldoen. Er zal tevens worden...report 1978
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Veldman, A.E.P. (author)This report presents a method for the calculation of boundary layers with strong viscous - inviscid interaction. The method differs from the classical methods for solving boundary layer equations, through the use of an interactive boundary condition which replaces the usually prescribed pressure. This boundary condition describes how the outer...report 1979
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Veldman, A.E.P. (author)In this report a mathematical model is presented which can describe the dynamic behaviour of liquids in partially filled containers under low gravitational conditions. This model will be used for the evaluation of a series of experiments which the NLR has planned to be performed onboard Spacelab. Furthermore, the report contains a description of...report 1979
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Veldman, A.E.P. (author)This paper presents a method for the calculation of boundary layers with strong viscous - inviscid interaction. The method differs from the classical methods for solving boundary layer equations, through the use of an interactive boundary condition which replaces the usually prescribed pressure. This boundary condition describes how the outer...report 1979
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Veldman, A.E.P. (author)A quasi-simultaneous method is described to calculate laminar, incompressible boundary layers interacting with an inviscid outer flow. The essential feature of this method is an interactive boundary condition prescribing a linear combination of pressure and displacement thickness which models the behaviour of the outer flow. This way the quasi...report 1980
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Veldman, A.E.P. (author)A quasi-simultaneous method is described to calculate laminar, incompressible boundary layers interacting with an inviscid external flow. The essential feature of this method is an interactive boundary condition prescribing a linear combination of pressure and displacement thickness, which models the behaviour of the external flow. This way the...report 1980
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Veldman, A.E.P. (author), Dijkstra, D. (author)A new and fast method to solve incompressible boundary-layer interaction problems will be presented. The method recognizes the important mutual influence of pressure and displacement thickness by simultaneously updating both these quantities as the boundary-layer is marched. The method can be overrelaxed and fast convergence is obtained,...report 1980
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- Veldman, A.E.P. (author) report 1980
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Vaatstra, W. (author), Veldman, A.E.P. (author), van der Vooren, J. (author)The method of Glowinski, Periaux and Pironneau for the calculation of transonic flow, which is based on the constrained minimization of a cost function, is critically evaluated for a case in which the transonic small perturbation equation is used. The resulting minimization problem is discretized in finite element form and solved using a...report 1980
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Veldman, A.E.P. (author), Vogels, M.E.S. (author)A numerical simulation program has been developed for the determination of dynamic liquid behaviour in partially filled cylindrical containers during weightlessness. The program, based on the unsteady Navier-Stokes equations, is capable to treat axisymmetric flow; arbitrary free-surface shapes are allowed. In the paper some examples are...report 1982
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Veldman, A.E.P. (author), Lindhout, J.P.F. (author)An outline is presented of a new code, called VISIAN, for the analysis of aerodynamic flows with strong viscous-inviscid interaction. The code is based on the recently developed quasi-simultsuieous method for the calculation of strongly interacting boundary layers. The feasibility of this method has already been demonstrated liy means of a...report 1983
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Veldman, A.E.P. (author)For about half a century attempts to calculate separated boundary layers have been frustrated by a Goldstein singularity, with which every calculation method in vogue in those days came to an untimely end. In this chapter the origin of this singularity will be elucidated from a numerical point of view. It is shown that the singularity is due to...report 1983
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Houwink, R. (author), Veldman, A.E.P. (author)Page 2 is missing.report 1984
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Veldman, A.E.P. (author), Lindhout, J.P.F. (author)A presentation is given of VISIAN, an analysis system for viscous-inviscid strong interaction. The code is based on a quasi-simultaneous solution procedure for viscous and inviscid parts of the flow field. The viscous region is calculated with an extension of the classical boundary-layer equations, featuring effects of normal pressure gradients...report 1984
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Veldman, A.E.P. (author), Vogels, M.E.S. (author)A mathematical model is presented for the description of axisymmetric three-dimensional transient flow of a viscous liquid in a partially filled cylindrical container under low gravity conditions. The mathematical model consists of the Navier-Stokes equations with either no-slip condition at the solid boundaries, and with the continuity of...report 1986
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- Botta, E.F.F. (author), Hut, F.J. (author), Veldman, A.E.P. (author) report 1986
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Henkes, R.A.W.M. (author), Veldman, A.E.P. (author)It is known that the classical boundary-layer solution breaks down by the appearance of the Goldstein singularity in a steady solution or Van Dommelen's singularity in an unsteady solution. Interaction between the inviscid flow and the boundary layer removes the Goldstein singularity, until a new critical parameter is reached, corresponding to a...report 1986
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Boerstoel, J.W. (author), Veldman, A.E.P. (author), van der Vooren, J. (author), van der Wees, A.J. (author)Current and mid-term developments in computational 3-D steady aerodynamics software at NLR, focusing on the efficient aerodynamic design of the next generation of transport aircraft, are surveyed on a global level. Following a brief review of the various levels of sophistication in physical flow modelling, and their relation to the aerodynamic...report 1986
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- Henkes, R.A.W.M. (author), Veldman, A.E.P. (author) report 1987
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Veldman, A.E.P. (author)Time-integration methods for partitioned dynamical systems and iterative methods for viscous-inviscid interaction are unified using the language of linear algebra. In this way all expertise built up in viscous-inviscid interaction methods becomes available for the integration of partitioned dynamical systems. This report applies some well...report 1989