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van Beek, C.M. (author), Piers, W.J. (author), Slooff, J.W. (author)
A boundary integral or "panel" method is described for computing the threedimensional, steady state, potential flow about ship configurations with or without lifting surfaces in the presence of a free surface in an initially undisturbed sea. The low order method is characterized by a special modelling of the free surface boundary condition, by...
report 1985
document
Slooff, J.W. (author)
A discussion is given of the physical mechanisms governing the hydrodynamics of sailing yacht keels and the parameters that, through these mechanisms, determine keel performance. It is concluded that due to the presence of the free water surface optimum keel shapes differ from optimum shapes for aircraft wings, a fact that does not seem to have...
report 1985
document
Fray, J.M.J. (author), Slooff, J.W. (author), Boerstoel, J.W. (author), Kassies, A. (author)
An engineering method for the design of airfoils having a prescribed pressure distribution in subsonic or transonic flow is described. The method is based on an iterative, "residual-correction" type of procedure. In each iteration step, the difference between the current and a target pressure distributions (residual) is determined by means of a...
report 1984
document
Fray, J.M.J. (author), Slooff, J.W. (author), Boerstoel, J.W. (author), Kassies, A. (author)
An engineering method for the design of airfoils having a prescribed pressure distribution in subsonic or transonic flow is described. The method is based on an iterative procedure of "residual-correction" type. In each iteration step, the difference between a current and a target pressure distribution (residual) is determined by a fast (multi...
report 1984
document
Slooff, J.W. (author)
An overview is provided of computational methods that can be used in solving the design problem of aerodynamics; i.e. the problem of finding the detailed shape of (parts of) configurations of which the gross geometric characteristics have already been determined in a preliminary, overall design process, and that, subject to certain constraints,...
report 1984
document
Slooff, J.W. (author)
A discussion is given of the physical mechanisms governing the hydrodynamics of sailing yacht keels and the parameters that, through these mechanisms, determine keel performance. It is concluded that due to the presence of the free water surface optimum keel shapes differ from optimum shapes for aircraft wings, a fact that does not seem to have...
report 1984
document
Slooff, J.W. (author)
Examples are discussed of the application of computational methods in aerodynamic design problems involving interference. Amongst these are: subsonic wing-body, sting support, pylon-nacelle and pylon-store interference, high-lift devices, induced drag minimization through constrained optimization in the Treftz-plane and transonic wing-fuselage...
report 1983
document
Slooff, J.W. (author)
An overview is provided of computational methods that can be used in solving the design problem of aerodynamics; i.e. the problem of finding the detailed shape of (parts of) configurations of which the gross geometric characteristics have already been determined in a preliminary, overall design process, and that, subject to certain constraints,...
report 1983
document
van der Kolk, J.T. (author), Slooff, J.W. (author)
Recent developments in computational fluid dynamics have led to a need for a data base against which results of various computational methods may be checked. As a test case for transonic flow around a commercial transport type configuration, the DFVLR-F'i wing body configuration has been selected by the GARTEUR Aerodynamics Action Group AD (AGOl...
report 1982
document
Slooff, J.W. (author)
A review is given of some current new developments at NLR in integral equation ("panel") methods for the computation of potential flows. One of these developments concerns the exact modeling of (nonlinear) compressibility effects through field source distributions, in combination with the artificial viscosity, retarded density and flux-splitting...
report 1982
document
van der Vooren, J. (author), van der Kolk, J.T. (author), Slooff, J.W. (author)
A description will be presented of a computer program system that is being used for the prediction of aircraft steady aerodynamic characteristics. Properties of the system are described from two different viewpoints. One is that of the aerodynamic designer, who needs an information system to predict lift, moment and drag characteristics and to...
report 1982
document
Slooff, W.J. (author)
A discussion is given of various "push" and "pull" factors affecting the development of a next generation of integral or panel methods for aerodynamic applications. Amongst the "push" factors to be discussed are increasing utilization and increasing requirements with respect to range of applicability, accuracy, ease and cost of application and...
report 1981
document
Fray, J.M.J. (author), Slooff, J.W. (author)
A computational method is presented for the design of "thick" wings with given pressure distribution in subsonic flow, in the presence of a body and/or other airplane components of fixed geometry. The method combines well-established linear techniques for the analysis of thick-wing configurations, and for the design of asymptotically thin wings....
report 1980
document
Boerstoel, J.W. (author), Slooff, J.W. (author), van de Vooren, J. (author)
report 1979
document
Piers, W.J. (author), Slooff, J.W. (author)
A method is described for the calculation of transonic flow based on an integral equation formulation. The integral equation is descretized in a way analogous to that used in the well-established panel methods for incompressible flow. The resulting system of non-linear equations is solved by means of a quasi-Newton method. By the introduction of...
report 1979
document
Piers, W.J. (author), Slooff, J.W. (author), Schipholt, G.J. (author)
report 1978
document
Boerstoel, J.W. (author), Piers, W.J. (author), Simons, J.L. (author), Slooff, J.W. (author), van de Vooren, J. (author)
report 1978
document
Slooff, J.W. (author), Voogt, N. (author)
A procedure is described for the aerodynamic design of thick wings with supercritical "shock-free" flow at the design condition. The procedure is based on the availability of computational methods for 2-D transonic flow (hodograph method) and 3-D subsonic flow (panel-type methods). Key feature of the design procedure is the choice and...
report 1978
document
Slooff, J.W. (author)
Paper presented at AGARD FDP Specialists' Meeting on NUMERICAL METHODS AND WIND TUNNEL TESTING, Rhode-St-Genêse, 23-24 June 1976.
report 1976
document
van der Vooren, J. (author), Slooff, J.W. (author), Huizing, G.H. (author), van Essen, A. (author)
report 1975
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