Curvature Effects of Three-dimensional Thick Stern Boundary Layers PDF Download
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Author: Yu-Tai Lee
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 50
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Book Description
Thick boundary-layer equations, including the variation of the metric coefficients with distance normal to the surface, are solved from the nose to the tail of an elongated three-dimensional body. Iteration between potential and boundary-layer flow solutions is adopted to obtain a converged solution in the stern region. The complete procedure makes use of Keller's box numerical scheme in a non-orthogonal curvilinear coordinate system and an isotropic eddy-viscosity model for the Reynolds stress tensor in both streamwise and crosswise directions. The numerical method allows the calculation of flows in which the crosswise component of velocity cntains regions of flow reversal across the boundary layer. The inviscid pressure is determined by using the Hess-Smith method. The program is validated for an axisymmetric body, and then the calculations are compared with measurements for two three-dimensional bodies having elliptical transverse sections. Keywords: Thick turbulent stern flows; Longitudinal and transverse curvature effects; Turbulence modeling; and Eddy viscosity.
Author: Yu-Tai Lee
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 50
Get Book Here
Book Description
Thick boundary-layer equations, including the variation of the metric coefficients with distance normal to the surface, are solved from the nose to the tail of an elongated three-dimensional body. Iteration between potential and boundary-layer flow solutions is adopted to obtain a converged solution in the stern region. The complete procedure makes use of Keller's box numerical scheme in a non-orthogonal curvilinear coordinate system and an isotropic eddy-viscosity model for the Reynolds stress tensor in both streamwise and crosswise directions. The numerical method allows the calculation of flows in which the crosswise component of velocity cntains regions of flow reversal across the boundary layer. The inviscid pressure is determined by using the Hess-Smith method. The program is validated for an axisymmetric body, and then the calculations are compared with measurements for two three-dimensional bodies having elliptical transverse sections. Keywords: Thick turbulent stern flows; Longitudinal and transverse curvature effects; Turbulence modeling; and Eddy viscosity.
Author: Milton Spinoza Plesset
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 1216
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Book Description
Author:
Publisher:
ISBN:
Category : Ship models
Languages : en
Pages : 328
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Book Description
Author:
Publisher:
ISBN:
Category : Naval architecture
Languages : en
Pages : 924
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Book Description
Author: Thomas T. Huang
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 34
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Book Description
When the curvature of a ships surface is large and the stern boundary layer is thick the cross-stream inviscid velocity and pressure variation becomes important in stern boundary layer computations. Two viscous-inviscid interaction computation procedures are presented. One uses a marching technique in a natural streamline coordinate system together with the turbulence model to solve the axisymmetric Reynolds-averaged parabolized Navier-Stokes equations for the streamline velocity (u) flow angle curvature, and hence the pressure (p). The numerical procedure starts at a station on the body where the boundary layer is thin and marches downstream into the wake. The boundary conditions for the values of u and p over the inlet plane and along a cylindrical stream surface outside the boundary layer/wake are set by the appropriate values obtained from the other simple viscous-inviscid interaction computations using a modified thin boundary layer method and potential flow calculations about an equivalent displacement body. Comparisons of measured axial and radial velocity and pressure distributions and those computed by the simple interaction approximations and partially parabolized techniques have been made. The simple and efficient viscous-inviscid procedure for the computation of velocity and pressure variations across thick turbulent stern flows has been shown to be accurate enough to use as a preliminary design tool. Originator supplied keywords include: Thick turbulent stern flows, boundary layer; turbulence modeling; viscous-inviscid flow interaction; axisymmetric flows.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1002
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Book Description
Author: Fathi Habashi
Publisher: CRC Press
ISBN: 9782884490320
Category : Technology & Engineering
Languages : en
Pages : 932
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Book Description
First published in 1995. Routledge is an imprint of Taylor & Francis, an informa company.
Author:
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 622
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Book Description
Author: R. A. Antonia
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 760
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1024
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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.
