A Prediction Method for Turbulent Boundary Layers in Adverse Pressure Gradients
A Prediction Method for Turbulent Boundary Layers in Adverse Pressure Gradients

Author: W. H. Schofield

Publisher:

Published: 1981

Total Pages: 16

ISBN-13: 9780642890085

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A prediction method for turbulent boundary layers in moderate to strong adverse pressure gradients is presented. The closure hypothesis for the method is the universal velocity defect law of Schofield and Perry (1972) which restricts the method to the prediction of layers in moderate to strong adverse pressure gradient. The method is tested against nine experimentally measured boundary layers. Predictions for velocity profile shape, boundary layer thicknesses and velocity scale ratio were generally in good agreement with the experimental measurements and were superior to those given by other prediction methods. Unlike other methods the present method also gives reasonably accurate predictions for the shear stress profile of a layer. The analysis presented here is compared with previous work and helps to resolve some disagreements discerned in the literature.

Momentum Integral Method for the Prediction of Turbulent Boundary Layer Parameters with Free Stream Turbulence and Pressure Gradients
Momentum Integral Method for the Prediction of Turbulent Boundary Layer Parameters with Free Stream Turbulence and Pressure Gradients

Author: John F. Love (student.)

Publisher:

Published: 1997

Total Pages:

ISBN-13:

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This report presents a method of determining the effect of free stream turbulence, FST, on turbulent boundary layer integral parameters for two-dimensional, incompressible flow over a flat plate, and also documents the results of a computer program that uses this methodology.

An Integral Prediction Method for Turbulent Boundary Layers Using the Turbulent Kinetic Energy Equation
An Integral Prediction Method for Turbulent Boundary Layers Using the Turbulent Kinetic Energy Equation

Author: E. A. Hirst

Publisher:

Published: 1968

Total Pages: 176

ISBN-13:

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A new integral method was devised for predicting the development of two-dimensional, incompressible, stationary turbulent boundary layers. This new method differs from the older integral methods in that it explicitly accounts for the turbulence via a characteristic turbulent velocity scale. A model of the turbulent kinetic energy integral equation is used to keep track of this turbulence scale. The model equation is developed on the basis of intuition, physical reasoning and some experimental evidence. In this new method the model equation is solved in conjunction with the momentum integral equation and the entrainment equation. A two-layer velocity profile is used. The law of the wall is assumed valid in the inner region and Coles' law of the wake is assumed valid in the outer region. The two profiles are joined by asymptotic matching; this gives an implicit equation for the skin friction. The predictions using this method are in excellent agreement with the measurements for fourteen different experimental boundary layers. (Author).