Predicting the Drag of Rough Surfaces

Author:

Chung Daniel1,Hutchins Nicholas1,Schultz Michael P.2,Flack Karen A.3

Affiliation:

1. Department of Mechanical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia;,

2. Department of Naval Architecture and Ocean Engineering, US Naval Academy, Annapolis, Maryland 21402, USA

3. Department of Mechanical Engineering, US Naval Academy, Annapolis, Maryland 21402, USA

Abstract

Reliable full-scale prediction of drag due to rough wall-bounded turbulent fluid flow remains a challenge. Currently, the uncertainty is at least 10%, with consequences, for example, on energy and transport applications exceeding billions of dollars per year. The crux of the difficulty is the large number of relevant roughness topographies and the high cost of testing each topography, but computational and experimental advances in the last decade or so have been lowering these barriers. In light of these advances, here we review the underpinnings and limits of relationships between roughness topography and drag behavior, focusing on canonical and fully turbulent incompressible flow over rigid roughness. These advances are beginning to spill over into multiphysical areas of roughness, such as heat transfer, and promise broad increases in predictive reliability.

Publisher

Annual Reviews

Subject

Condensed Matter Physics

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