A Calculation Method for the Three-dimensional Boundary-layer Equations in Integral Form PDF Download
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Author: Bilal Hafeez Mughal
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
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Book Description
Author: Bilal Hafeez Mughal
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
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Book Description
Author: Bilal Mughal
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Sang-Wook Kang
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 138
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Book Description
Author: Timothy Wade Swafford
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 300
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Book Description
A method is presented for computing three-dimensional, time-dependent, compressible, turbulent boundary layers in nonorthogonal curvilinear coordinates. An integral method is employed in the interest of computational speed and because the three-dimensional method is an extension of an existing two-dimensional method. After presenting a detailed derivation of the integral form of the boundary-layer equations, the necessary auxiliary relations are given along with the relationships between integral lengths expressed in streamline and nonorthogonal coordinates. A time dependent approach is used to account for time accuracy (if desired) and to provide a method that is compatible with the surface grid used by an inviscid solver for use in viscous-inviscid interaction calculations. The equations are solved using a Runge-Kutta scheme with local time stepping to accelerate convergence. Stability and convergence of the numerical scheme are examined for various space differences compared with measurements and with computations of previous investigators.
Author: T. F. Zien
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Book Description
The simple integral method developed and successfully employed by the author to provide accurate approximate solutions to a wide variety of problems in viscous boundary-layer flows and transient heat conduction with phase changes is further studied. A simple boundary value problem in ordinary differential equation is used as the model problem for the study. Different schemes of the method used in earlier applications are examined in some detail along with a new and potentially more accurate scheme. On the basis of the comparison between the approximate solutions and the exact solution, some remarks on the relative merits of the various schemes are made along with some observations on the judicious choice of the approximate profiles for use in the calculation. The method is then applied to yield approximate solutions of a class of relatively simple three-dimensional boundary-layer flows. Results are reported of boundary layers on a semi-infinite flat plate with parabolic and circular inviscid surface streamlines, and boundary layers over an infinite yawed wing. Results are presented in terms of skin-friction, and are all obtained in simple closed form. Comparisons with existing exact solutions are included to indicate the accuracy of the method. (Author).
Author: Hans W. Stock
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Theo Geis
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 96
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Author: Nancy Carol Groves
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ISBN:
Category : Blades
Languages : en
Pages : 52
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Book Description
A general formulation of the boundary-layer computation scheme on the surface of a rotating blade is presented. Momentum-integral methods, together with the three-dimensional entrainment equation for a rotating disk, are used to calculate the three-dimensional turbulent boundary layer in an orthogonal streamline coordinate system. First-order finite-difference methods are used to solve the resulting boundary-layer equations. The unknown variables are the streamwise momentum thickness, the shape parameter, and the streamline slope at the surface. The boundary-layer calculation method is combined with existing geometrical and inviscid potential-flow computer codes for rotating blades to form an efficient turbulent boundary-layer computer code. For a given potential-flow solution, a typical boundary-layer computation requires less than 10 seconds computer time on the Burroughs 7700 high-speed computer. Boundary-layer predictions are presented for several rotating blades. Computed results are shown to be in agreement with experimental data for a simple rotating body. For the examples considered, displacement of the mid-chord point of a blade from a straight radial line is predicted to reduce the computed values of local skin friction coefficient, with an estimated increase in overall efficiency of about one percentage point. (Author).
Author: V. A. Barinov
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
Author: Bernhard Stoevesandt
Publisher: Springer Nature
ISBN: 3030313077
Category : Technology & Engineering
Languages : en
Pages : 1495
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Book Description
This handbook provides both a comprehensive overview and deep insights on the state-of-the-art methods used in wind turbine aerodynamics, as well as their advantages and limits. The focus of this work is specifically on wind turbines, where the aerodynamics are different from that of other fields due to the turbulent wind fields they face and the resultant differences in structural requirements. It gives a complete picture of research in the field, taking into account the different approaches which are applied. This book would be useful to professionals, academics, researchers and students working in the field.
