Stern Boundary-layer Flow on a Three-dimensional Body of 2:1 Elliptic Cross Section PDF Download
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Author: Thomas T. Huang
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 102
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Book Description
A comprehensive set of experimental data for flow over the stern of a three-dimensional model having 2:1 elliptic transverse cross sections, suitable for analytical comparisons, is presented. Included in this set are surface pressure and shear stress distributions, static pressure and mean velocity profiles, and Reynolds stresses. The eddy viscosity and mixing length values obtained from the measured Reynolds stresses and mean velocity gradients are also presented. The measured and derived data are compared with the predictions of existing three-dimensional theoretical methods. These comparisons confirm the need for improved prediction techniques in the thick turbulent boundary-layer region of the stern. (Author).
Author: Thomas T. Huang
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 102
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Book Description
A comprehensive set of experimental data for flow over the stern of a three-dimensional model having 2:1 elliptic transverse cross sections, suitable for analytical comparisons, is presented. Included in this set are surface pressure and shear stress distributions, static pressure and mean velocity profiles, and Reynolds stresses. The eddy viscosity and mixing length values obtained from the measured Reynolds stresses and mean velocity gradients are also presented. The measured and derived data are compared with the predictions of existing three-dimensional theoretical methods. These comparisons confirm the need for improved prediction techniques in the thick turbulent boundary-layer region of the stern. (Author).
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:
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ISBN:
Category : Science
Languages : en
Pages : 196
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 644
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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:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 654
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Book Description
Author: British Ship Research Association
Publisher:
ISBN:
Category : Shipbuilding
Languages : en
Pages : 938
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Book Description
Consists largely of abstracts of articles and papers of interest to shipbuilders, ship owners and marine engineers.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 648
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Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Author:
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Category :
Languages : en
Pages : 582
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Book Description
Author:
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1236
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Book Description
