Kemal (Kemo) Hanjalic Marie Curie Chair in Computer Modelling and Simulation Sapienza University, Rome, Italy Presentation Title: Some continuing challenges in computational turbulent convection Abstract: Despite indisputable progress, proven potential and widespread use in research and applications, computational modelling and simulation of turbulent flows, heat and mass transfer have been shown to have still serious limitations especially when considering complex configurations and very high Reynolds and Rayleigh numbers. Unfortunately, such problems are also very challenging for experiments. By identifying niches where measurements, simulations and modelling each offers uncontested primacy, we discuss the complementary benefits and synergy when used in parallel. Examples from our recent experience are presented where combined experiments and simulations provided not only precious information, but also revealed some unexpected phenomena which could have remained hidden if the problem was investigated only experimentally or only by simulations. Among examples considered are some paradigms of turbulent flows and heat transfer, and a challenging MHD problem: natural convection over horizontal flat or irregular surfaces in a broad range of conditions including extreme (Òultra hardÓ) regimes at Ra>1012, forced convection in impinging and separating flows at higher Re numbers, and magnetic convection pertinent to fluid-magnetic dynamos encountered in Earth and other planets. By recognizing that direct and large-eddy simulations (DNS, LES) are nor feasible at such extreme conditions, and that Reynolds-averaged Navier Stokes (RANS) models cannot be trusted for research purposes, the focus is placed on combined LES-RANS and VLES approaches. Their potential and limitations are discussed, and the rationales illustrated by several examples of generic and real-life industrial and environmental applications. Biography: Kemal (Kemo) Hanjalic, MSc (Univ. Birmingham, UK), PhD (Imperial College, London, UK), holds currently a (EU) Marie Curie Chair in Computer Modelling and Simulation at the Sapienza University of Rome, Italy. He served as Professor and Head of the Thermal and Fluids Sciences in the Department of Multi-scale Physics at TU Delft, The Netherlands (1994-2005), Professor at the Michigan University of Technology, USA (1993-1994), DAAD/DFG Guest Professor at Darmstadt University of Technology, (2005-2006) and University of Erlangen, Germany (1991-1993). Prior to 1991, he served as Professor and Dean of Mechanical Engineering and Institute Director at the University of Sarajevo. Prof. Hanjalic has published extensively on topics of fluid flow, turbulence measurements, modeling and simulation, heat transfer and combustion, magneto-fluid-dynamics, and has been internationally recognized as a major contributor to the development of mathematical models of turbulence. He has also worked on development of equipment and processes in thermal engineering: piston and screw compressors, entrained coal-gasification, pulse combustors, detonation wave technique for deposit removal (patented and used in coal-fired boilers) and has consulted with industries in Europe, the USA and Singapore. Currently, he is Editor-in-Chief of the "Flow, Turbulence and Combustion" journal (Springer), and a member of the editorial and advisory boards of a number of other international journals. His honours include the Max Plank Research Award (Germany) for achievements in the research of turbulence, a D.Sc. (Eng) from the Univ. London (UK) and an honorary doctorate from the University of Reims, Champagne and Ardenne (France). He is an elected International Fellow of Royal Academy of Engineering (FREng) (UK) and Fellow of the Institute of Physics (FInstP), of ASME and of ICHMT.