Wall-bounded turbulent flows at high Reynolds numbers: Recent advances and key issues
Wall-bounded turbulent flows at high Reynolds numbers have become an increasingly active area of research in recent years. Many challenges remain in theory, scaling, physical understanding, experimental techniques, and numerical simulations. In this paper we distill the salient advances of recent origin, particularly those that challenge textbook orthodoxy. Some of the outstanding questions, such as the extent of the logarithmic overlap layer, the universality or otherwise of the principal model parameters such as the von Kármán "constant," the parametrization of roughness effects, and the scaling of mean flow and Reynolds stresses, are highlighted. Research avenues that may provide answers to these questions, notably the improvement of measuring techniques and the construction of new facilities, are identified. We also highlight aspects where differences of opinion persist, with the expectation that this discussion might mark the beginning of their resolution.
© 2010 American Institute of Physics. Received 17 February 2010; accepted 14 May 2010; published online 29 June 2010. We wish to thank all of our colleagues who have contributed to the International Workshop series with their participation and various communications. The International Center for Theoretical Physics, Trieste, and the Ettore Majorano Foundation and Center for Scientific Culture, Erice, are gratefully acknowledged for their financial and managerial support of the 2004 and 2006 workshops, respectively. The financial support of the Australian Research Council (I.M.), the National Science Foundation (B.J.M. and A.J.S.), and the Office of Naval Research (A.J.S.) is also gratefully acknowledged.
Published - Marusic2010p10938Phys_Fluids.pdf