Numerical Study of Three Viscous/Inviscid Interaction Methods PDF Download
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Author: Jeffrey C. Tromp
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
The study of flows with viscous/inviscid interaction has attracted many researchers over the last decade. These flows occur whenever the adverse gradient is large enough to cause flow separation. The current emphasis is to find efficient ways of solving these types of flows without solving the full Navier-Stokes equations. Three methods for solving the viscous/inviscid problem were studied. The first method uses finite difference equations to model both the viscous and inviscid regions. A coupling scheme is developed to match the two solutions. The second method solves the integral boundary layer equations in the viscous region and finite difference equations in the inviscid region. The third method solves the Hilbert integral to generate a correction to the inviscid velocity using the boundary layer equations as the viscous model. The model problem used in this work is Howarth flow over a flat plate. The three methods were evaluated in terms of solution accuracy, memory requirements, and computation times. Theses. (mjm).
Author: Jeffrey C. Tromp
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
The study of flows with viscous/inviscid interaction has attracted many researchers over the last decade. These flows occur whenever the adverse gradient is large enough to cause flow separation. The current emphasis is to find efficient ways of solving these types of flows without solving the full Navier-Stokes equations. Three methods for solving the viscous/inviscid problem were studied. The first method uses finite difference equations to model both the viscous and inviscid regions. A coupling scheme is developed to match the two solutions. The second method solves the integral boundary layer equations in the viscous region and finite difference equations in the inviscid region. The third method solves the Hilbert integral to generate a correction to the inviscid velocity using the boundary layer equations as the viscous model. The model problem used in this work is Howarth flow over a flat plate. The three methods were evaluated in terms of solution accuracy, memory requirements, and computation times. Theses. (mjm).
Author: Ramesh Yapalparvi
Publisher:
ISBN:
Category :
Languages : en
Pages : 197
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 380
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Sarkis Hendrik Bos
Publisher:
ISBN:
Category :
Languages : en
Pages : 139
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Book Description
Author: S. Bos
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 31
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 400
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Author: Sungyul Yoo
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 0
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Book Description
A viscous inviscid interaction method for three dimensional flows, in which the partially parabolic Reynolds equations are coupled with an inviscid flow solution procedure in an interactive and iterative manner, is applied to two simple three dimensional bodies for which experimental data are available for comparison. The relative merits of interactive and global solution procedures are evaluation by comparing the viscous inviscid interaction solutions with noninteractive large domain solutions of only the viscous flow equations. Both methods yield satisfactory results, although the interaction solutions are found to be computationally more efficient for the cases considered. Keywords: Thick Three Dimensional Layer; Viscous Inviscid Interaction; Partially parabolic Equations; Computational Fluid Dynamics.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Author: Frederick Stern (Professor of engineering)
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 76
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Book Description
A viscous inviscid interaction method for three dimensional flows, in which the partially parabolic Reynolds equations are coupled with an inviscid flow solution procedure in an interactive and iterative manner, is applied to two simple three dimensional bodies for which experimental data are available for comparison. The relative merits of interactive and global solution procedures are evaluation by comparing the viscous inviscid interaction solutions with noninteractive large domain solutions of only the viscous flow equations. Both methods yield satisfactory results, although the interaction solutions are found to be computationally more efficient for the cases considered. Keywords: Thick Three Dimensional Layer; Viscous Inviscid Interaction; Partially parabolic Equations; Computational Fluid Dynamics.
Author: Emmanuel Branlard
Publisher: Springer
ISBN: 3319551647
Category : Technology & Engineering
Languages : en
Pages : 632
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Book Description
The book introduces the fundamentals of fluid-mechanics, momentum theories, vortex theories and vortex methods necessary for the study of rotors aerodynamics and wind-turbines aerodynamics in particular. Rotor theories are presented in a great level of details at the beginning of the book. These theories include: the blade element theory, the Kutta-Joukowski theory, the momentum theory and the blade element momentum method. A part of the book is dedicated to the description and implementation of vortex methods. The remaining of the book focuses on the study of wind turbine aerodynamics using vortex-theory analyses or vortex-methods. Examples of vortex-theory applications are: optimal rotor design, tip-loss corrections, yaw-models and dynamic inflow models. Historical derivations and recent extensions of the models are presented. The cylindrical vortex model is another example of a simple analytical vortex model presented in this book. This model leads to the development of different BEM models and it is also used to provide the analytical velocity field upstream of a turbine or a wind farm under aligned or yawed conditions. Different applications of numerical vortex methods are presented. Numerical methods are used for instance to investigate the influence of a wind turbine on the incoming turbulence. Sheared inflows and aero-elastic simulations are investigated using vortex methods for the first time. Many analytical flows are derived in details: vortex rings, vortex cylinders, Hill's vortex, vortex blobs etc. They are used throughout the book to devise simple rotor models or to validate the implementation of numerical methods. Several Matlab programs are provided to ease some of the most complex implementations.
