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Boerstoel, J.W. (author)The application of multigrid relaxation to transonic potential-flow calculation was investigated. Fully conservative potential flows around aerofoils were taken as test problems. The solution algorithm was based on Newton iteration. In each Newton iteration step, multigrid relaxation was used to calculate correction potentials. It was found that...report 1981
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- Boerstoel, J.W. (author), Slooff, J.W. (author), van de Vooren, J. (author) report 1979
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Boerstoel, J.W. (author)TRAFS is a new fast-solver program for the calculation of steady subsonic and transonic inviscid flows around aerofoils. It uses a potential-flow model representing mass conservation in the flow. Potential users of TRAFS are given an impression of the user capabilities. These are illustrated by analyzing sixteen flow cases covering...report 1982
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- Boerstoel, J.W. (author), Huizing, G.H. (author) report 1971
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Boerstoel, J.W. (author)In dit literatuviroverzicht wordt een bespreking gegeven van de gelineariseerde transsone theorieën voor vlakke symmetrische en aaiaal symmetrische stromingen, zoals die door Oswatitsch en Keune, Maeder en Thommen, en Spreiter en Alksne zijn ontwikkeld. Een vereenvoudigde versie van de theorie van de z.g. gelineariseerde transsone...report 1963
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Boerstoel, J.W. (author)The application of a combination of Newton iteration and multigrid line relaxation to transonic potential-flow calculations was investigated. Fully conservative potential flows around aerofoils were used as test problems. The multigrid process was used in each Newton iteration step to calculate correction potentials. It was found that the...report 1981
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Boerstoel, J.W. (author)An analysis of various alternative approaches in grid generation is presented. A grid-generation procedure for complex aircraft configurations could be based on a combination of three subprocesses, . decomposition of the flow domain into about 100 hexahedronal blocks, . trilineair transfinite interpolation to generate initial grid point...report 1986
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Boerstoel, J.W. (author)Na inleidende opmerkingen betreffende de state-of-the-art van het berekenen van stromingen op basis van de Euler vergelijkingen wordt voorgesteld rekenprogramma's te ontwikkelen voor de simulatie van propellor slipstroom-effecten over motorgondel-vleugel configuraties. Verder zal aandacht worden geschonken aan de berekening van stromingen in het...report 1985
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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
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Boerstoel, J.W. (author)The results of the computation of fifteen symmetrical non-lifting quasi-elliptical aerofoil sections in steady sub-critical and critical potential flows are presented. These results are exact in the sense, that no approximations have been made in the potential theory, and that the errors in the results are of numerical nature only. The results...report 1968
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Boerstoel, J.W. (author), Simons, J.L. (author)The two-dimensional transonic small-perturbation equation is solved by a higher-order finite element method using a combination of a Galerkin orthogonalization procedure and a least-squares method. It is shown that this higher-order method requires a non-trivial formulation of the discrete boundary conditions. The Galerkin orthogonalization...report 1978
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- Boerstoel, J.W. (author) report 1988
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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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- Boerstoel, J.W. (author), Huzing, G.H. (author) report 1974
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Wubs, F.W. (author), Boerstoel, J.W. (author), van der Wees, A.J. (author)An error analysis is presented of the numerical calculation of the steady flow on an infinite domain around a given airfoil by a domainsplitting (= zonal) method. This method combines a fully conservative finite-difference approximation on a finite domain around the airfoil with an approximate asymptotic solution outside this finite domain. The...report 1983
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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
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Buijsen, F.A. (author), Kassies, A. (author), Boerstoel, J.W. (author)The results of calculations of two- and three-dimensional flows on blocked grid domains consist of vast data collections with a simple, regular structure. The inspection of these results can only be done efficiently by graphical means, and by exploiting the regular structure of the data. There is a large similarity between the format of the...report 1988
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Boerstoel, J.W. (author)In Euler-flow calculations based on cell-centered schemes, the number of equations required to determine the flow-state evaluation at grid points half a mesh outside the flow domain usually exceeds the number of boundary-condition equations provided by characteristic theory. Here, the required additional equations are obtained by a physically...report 1987
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Boerstoel, J.W. (author)Dit memo heeft tot doel bij te dragen in de discussies over het ontwikkelen van nieuwe rekenprogramma's voor drie-dimensionale stationaire transsone stromingen om romp-vleugel combinaties. Gepresenteerd wordt: a. een inventarisatie van thans bekende snelle oplossers voor randwaarde problemen van partiële differentiaal vergelijkingen; b. een...report 1977
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Boerstoel, J.W. (author)An introductory description of a hodograph method for the Computation of advanced shock-free aerofoils is presented. The method is based on the approximate solution of Tricomi boundary value problems for the hodograph equations. The approximate solution is a sum of a basic solution having the required singularity on the hodograph surface...report 1964