IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls: Proceedings of the IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls, held Cambridge, UK, Jul

ISBN-13: 9789048196302 / Angielski / Twarda / 2010 / 184 str.

T. B. Nickels

Opis

This work describes the state-of-the-art in the understanding of turbulent wall-bounded flows developing on rough surfaces. This symposium brought together the best researchers in the field to discuss the technical issues and develop a consistent approach to the subject - hence it is an up-to-date reference work for research in this area.

Spis treści

Direct Numerical Simulation and PIV measurement of turbulentboundary layer over a rod-roughened wall, by S.-H. Lee, J.H. Lee & H.J. Sung; TURBULENT FLOWS OVER ALIGNED AND INCLINED RIBS, by M. F. Tachie and M. Agelinchaab; An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars, by Dubravka Pokrajac; Boundary Layer Structure over a Two-dimensional Rough Wall, by M.P. Schultz, R.J. Volino & K.A. Flack; Turbulence in pipe flows with small relative roughness, by Alexander Smits, Sean C. C. Bailey, Rick L. Pepe, and Michael P. Schultz; LDV Measurement near a Rough Surface for a Turbulent Boundary Layer, by Takatsugu Kameda, Shinsuke Mochizuki and Hideo Osaka; POD analysis of the near-wall region of a rough wall turbulent boundary layer , by L. Djenidi, R. A. Antonia, M. Amielh and F. Anselmet; An Experimental Study of a Turbulent Wall Jet on Smooth and Rough Surfaces, by N. Rostamy, D. J. Bergstrom, D. Sumner; Turbulent Flow Over Urban-Type Roughness Using PIV, by M. Amir and I. P. Castro; A high Reynolds number turbulent boundary layer with regular ‘braille-type’ roughness, by J.P. Monty, M.S. Chong, R. Mathis, N. Hutchins, I. Marusic, and J.J. Allen; On the outler layer controversy for a turbulent boundary layer over a rough wall, by R. A. Antonia, L. Djenidi; Turbulent Channel Flow over Model “Dynamic” Roughness, by Beverley J. McKeon; Log-layer dynamics in smooth and artificially-rough turbulent channels, by Oscar Flores and Javier Jiménez; Roughness Scaling Parameters in the Fully-rough Regime, by K.A. Flack and M.P. Schultz; Transition in Rough Channels, by P. Orlandi; Effect of Isotropic Free-stream Turbulence in Favorable Pressure Gradient Turbulent Boundary Layers over a Rough Surface, by S. Torres-Nieves, J.R. Lebrón, H.S. Kang, B. Brzek, R.B. Cal, C. Meneveau and L. Castillo; Particulate impact and erosion in a turbulent serpentine channel, by Paul Durbin and Xin Huang; Rough wall skin friction measurements using a highresolution surface Balance, by Per-Åge Krogstad and Vladislav Efros; Modified Hierarchy Structure of Rough-wall Flows, by Joseph Klewicki and Faraz Mehdi; Analysis of Instantaneous Velocity Vector in Geostrophic Turbulent Ekman Layer over a Transitional Rough Surface , by Noor Afzal; Wall roughness effects: A second law analysis (SLA), by H. Herwig, T. Wenterodt; Coherent structures in turbulent flow over arrays of cubical obstacles, by Stefano Leonardi and Ian Castro; Large Roughness Effects in Channel Flow, by D. M. Birch and J. F. Morrison; Very-rough-wall channel flows: a DNS study, by Ian P. Castro & Stefano Leonardi.

Blurb

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.