The study of wall-bounded turbulent flows is of considerable interest from both scientific and practical view points. As such it has attracted a great deal of research over the last 100 years. Much research has concentrated on flows over smooth walls since these are simpler from experimental, numerical and theoretical standpoints. The flow over rough walls has still received considerable attention but progress has necessarily been slower. Perhaps the most essential problem (certainly from a practical point of view) is to be able to predict the skin-friction drag acting on a plate (or a body) given a certain known roughness characteristic of the surface. Unfortunately this has proved to be very difficult since even the simplest rough surfaces can be characterised by a number of different parameters and we still cannot directly connect these to the fluid dynamic drag in a given situation. Various theories and models have been proposed in order to make progress but there is still some disagreement in the community as to the correct understanding of these important flows. The IUTAM Symposium on the Physics of Wall-bounded Flows on Rough Walls was held in Clare College, Cambridge from the 7th - 9th July 2009 in order to bring together various expert researchers in the field to try and resolve some of these disagreements and to develop a consensus on the most fruitful directions of future research.
Author(s): Seung-Hyun Lee, Jae Hwa Lee, Hyung Jin Sung (auth.), T. B. Nickels (eds.)
Series: IUTAM Bookseries 22
Edition: 1
Publisher: Springer Netherlands
Year: 2010
Language: English
Pages: 184
Tags: Engineering Fluid Dynamics;Fluid- and Aerodynamics;Theoretical, Mathematical and Computational Physics
Front Matter....Pages i-xi
Direct Numerical Simulation and PIV Measurement of Turbulent Boundary Layer over a Rod-Roughened Wall....Pages 1-11
Turbulent Flows over Aligned and Inclined Ribs....Pages 13-19
An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars....Pages 21-26
Boundary Layer Structure over a Two-Dimensional Rough Wall....Pages 27-32
Turbulence in Pipe Flows with Small Relative Roughness....Pages 33-42
LDV Measurement Near a Rough Surface for a Turbulent Boundary Layer....Pages 43-48
POD Analysis of the Near-Wall Region of a Rough Wall Turbulent Boundary Layer....Pages 49-54
An Experimental Study of a Turbulent Wall Jet on Smooth and Rough Surfaces....Pages 55-60
Turbulent Flow Over Urban-Type Roughness Using PIV....Pages 61-67
A High Reynolds Number Turbulent Boundary Layer with Regular ‘Braille-Type’ Roughness....Pages 69-75
On the Outer Layer Controversy for a Turbulent Boundary Layer over a Rough Wall....Pages 77-86
Turbulent Channel Flow over Model “Dynamic” Roughness....Pages 87-92
Log-Layer Dynamics in Smooth and Artificially-Rough Turbulent Channels....Pages 93-98
Roughness Scaling Parameters in the Fully-Rough Regime....Pages 99-104
Transition in Rough Channels....Pages 105-111
Effect of Isotropic Free-stream Turbulence in Favorable Pressure Gradient Turbulent Boundary Layers over a Rough Surface....Pages 113-119
Particulate Impact and Erosion in a Turbulent Serpentine Channel....Pages 121-125
Rough Wall Skin Friction Measurements Using a High Resolution Surface Balance....Pages 127-133
Modified Hierarchy Structure of Rough-Wall Flows....Pages 135-141
Analysis of Instantaneous Velocity Vector in Geostrophic Turbulent Ekman Layer over a Transitional Rough Surface....Pages 143-150
Wall Roughness Effects: A Second Law Analysis (SLA)....Pages 151-156
Coherent Structures in Turbulent Flow over Arrays of Cubical Obstacles....Pages 157-165
Large Roughness Effects in Channel Flow....Pages 167-173
Very-Rough-Wall Channel Flows: A DNS Study....Pages 175-181
