Computation Of Incompressible Three Dimensional Turbulent Boundary Layers And Comparison With Experiment
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Computation Of Incompressible Three Dimensional Turbulent Boundary Layers And Comparison With Experiment
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-08-13
Computation Of Incompressible Three Dimensional Turbulent Boundary Layers And Comparison With Experiment written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-13 with categories.
Incompressible three dimensional, turbulent boundary layer (3DTBL) experiments were simulated numerically by integrating the boundary layer equations together with an algebraic eddy viscosity turbulence model. For the flow treated, the downstream portion, where the crossflow was large, was not predicted with the present computational method; the flow was significantly influenced by elliptic flow field effects. Departures from the boundary layer concept are indicated. Calculations agreed reasonably well with the mean flow development up to separation. In one experiment the normal pressure gradients were found to be neligible in regions with large skewing and allowed testing turbulence models using the boundary layer equations. The simulation of this flow compared favorably with the experimental data throughout the flow field and suggested the applicability of algebraic eddy viscosity models for 3DTBLs. Mueller, U. R. Ames Research Center NASA-TM-84230, A-8873, NAS 1.15:84230 ...
Computation Of Incompressible Three Dimensional Turbulent Boundary Layers And Comparison With Experiment
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Author :
language : en
Publisher:
Release Date : 1982
Computation Of Incompressible Three Dimensional Turbulent Boundary Layers And Comparison With Experiment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Calculation Of Three Dimensional Boundary Layers On Ship Forms
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Author : Kua C. Chang
language : en
Publisher:
Release Date : 1975
Calculation Of Three Dimensional Boundary Layers On Ship Forms written by Kua C. Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Boundary layer categories.
An implicit finite difference technique, in curvilin ear-orthogonal surface coordinates, has been developed for the solution of the differential equations of three-dimensional laminar and turbulent boundary layers on ship forms. For turbulent flow, a two-layer eddy-viscosity model has been employed as the closure model. The initial and boundary conditions required to solve the equations and the stability and accuracy of the numerical method are discussed at some length. Two mathematically-defined simple three-dimensional ship forms are studied in some detail. These are a tri-axial ellipsoid and a double elliptic ship.
A General Method For Calculating Three Dimensional Incompressible Laminar And Turbulent Boundary Layers Ii Three Dimensional Flows In Cartesian Coordinates
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Author : Tuncer Cebeci
language : en
Publisher:
Release Date : 1974
A General Method For Calculating Three Dimensional Incompressible Laminar And Turbulent Boundary Layers Ii Three Dimensional Flows In Cartesian Coordinates written by Tuncer Cebeci and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with categories.
The report presents a general method for computing three-dimensional laminar and boundary-layer flows in Cartesian coordinates. In the equations, the Reynolds shear stress terms are modeled by an eddy-viscosity formulation developed by the author. A very efficient two-point finite-difference method was used to solve the governing equations. The accuracy of the method is investigated for laminar and turbulent flows. (Author).
A General Method For Calculating Three Dimensional Compressible Laminar And Turbulent Boundary Layers On Arbitrary Wings
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Author : Tuncer Cebeci
language : en
Publisher:
Release Date : 1977
A General Method For Calculating Three Dimensional Compressible Laminar And Turbulent Boundary Layers On Arbitrary Wings written by Tuncer Cebeci and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Airplanes categories.
Theoretical Investigation Of Three Dimensional Shock Wave Turbulent Boundary Layer Interactions Part 4
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Author :
language : en
Publisher:
Release Date : 1986
Theoretical Investigation Of Three Dimensional Shock Wave Turbulent Boundary Layer Interactions Part 4 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
A theoretical model consists of the Reynolds-averaged 3-D compressible Navier-Stokes equations, with turbulence incorporated using the algebraic turbulent eddy viscosity model of Baldwin and Lomax, This year research efforts focused on both 2-D and 3-D turbulent interactions. A theoretical model was examined for a series of separated 2-D compression corner flows at Mach 2 and 3. Calculations were performed for four separate compression corners using 2-D compressible Navier-Stodes conde with MacCormack's hybrid algorithm. Results were compared to earlier computations using the Beam-Warming algorithm, and recent experiment data for turbulent Reynolds stresses. Calculated Reynolds stresses were observed to differ significantly from experimental measurements due to the inability of the turbulence model to incorporate the multiple scale effects of the turbulence structure downstream of reattachment. Computed results using the MacCormack hybrid algorithm were observed to be insensitive to the Courant number. The 3-D turbulence interactions research concentrated on the 3-D sharp fin and on the 3-D swept compression corner. In the former case, the computed flowfield for the 20 deg sharp fin at Mach 3 and a Reynolds number of 930,000 was compared with the calculated results of Horstman (who used the Jones-Launder turbulence model) and experimental data of the Princeton Gas Dynamics Lab. Overall comparison with experiment was very good.
Calculations Of Three Dimensional Turbulent Boundary Layers Using The Crank Nicolson Method
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Author : P. A. Krogstad
language : en
Publisher:
Release Date : 1982
Calculations Of Three Dimensional Turbulent Boundary Layers Using The Crank Nicolson Method written by P. A. Krogstad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Turbulent boundary layer categories.
This report describes the results of the three-dimensional turbulent boundary-layer calculations performed for the Eurovisc Workshop held in Berlin on 1 April 1982. It is shown that the present method, based on the Crank-Nicolson finite-difference scheme and a simple eddy-viscosity model for turbulence, yields satisfactory results provided regions of viscous-inviscid interaction, which were present in at least three of the four test cases, are avoided. (Author).
A General Method For Calculating Three Dimensional Incompressible Laminar And Turbulent Boundary Layers Iii Three Dimensional Flows In Curvilinear Orthogonal Coordinates
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Author : Tuncer Cebeci
language : en
Publisher:
Release Date : 1975
A General Method For Calculating Three Dimensional Incompressible Laminar And Turbulent Boundary Layers Iii Three Dimensional Flows In Curvilinear Orthogonal Coordinates written by Tuncer Cebeci and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.
This report summarizes the third phase of studies conducted on the computation of three-dimensional incompressible laminar and turbulent boundary layers. Solutions of the governing equations in curvilinear orthogonal coordinates are presented for a curved rectangular duct. In addition the small-cross-flow method developed by Cebeci, Kaups, and Mosinskis is applied to compute the boundary layer on a cargo ship hull. The method uses the eddy-viscosity concept to model the Reynolds shear-stress terms and uses a very efficient two-point finite-differnce method to solve the governing equations.
A General Method For Calculating Three Dimensional Incompressible Laminar And Turbulent Boundary Layers I Swept Infinite Cylinders And Small Cross Flow
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Author :
language : en
Publisher:
Release Date : 1972
A General Method For Calculating Three Dimensional Incompressible Laminar And Turbulent Boundary Layers I Swept Infinite Cylinders And Small Cross Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
The report presents a general method for solving the laminar and turbulent boundary layer equations for swept infinite cylinders and for small cross flows. In the equations the Reynolds shear stress terms are eliminated by using an eddy viscosity concept. An efficient two-point finite-difference method used earlier by Keller and Cebeci for two dimensional flows is used to solve the governing equations. The method has been programmed on the IBM 370/165. (Author).
Calculation Of Three Dimensional Boundary Layers On Bodies At Incidence
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Author : V. C. Patel
language : en
Publisher:
Release Date : 1982
Calculation Of Three Dimensional Boundary Layers On Bodies At Incidence written by V. C. Patel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Turbulent boundary layer categories.
Three-dimensional thin boundary-layer equations for laminar and turbulent flows are solved by two different numerical schemes. The methods are applied to the flow over bodies of revolution at incidence and the results are compared with the available experimental data in order to study the range of validity of the classical boundary-layer approximations in regions of increasing circumferential gradients and flow reversal associated with the early stages of a free-vortex type of separation. Comparison with the DFVLR 6:1 spheroid data of Meier et al and the 4:1 combination-body data of Ramaprian, Patel and Choi indicate that the methods perform well in regions where the boundary layer remains thin but the predictions deteriorate as the boundary layer thickens. The results point out the need for the development of methods of handle thick boundary layers and viscous-inviscid interactions. (Author).