Multi-scale applications, such as low-emission combustion processes and low-noise design, require advanced predictive capabilities and a level of accuracy well beyond that provided by today’s flow simulations tools. A direct representation of the dynamic evolution of the large-scale motions is the key to a realistic description of the relevant physical process. Large Eddy Simulations (LES) pioneered at Stanford University in the 70s has become a fundamental research tool yielding formidable insights into the controlling physics of many engineering phenomena. In spite of increased popularity in Academia, high-fidelity simulations not yet achieved wide-spread use in industry.
CharLES has been developed by Cascade Technologies Inc. specifically to perform LES calculations in general configurations. The numerical discretization schemes are designed to provide an accurate representation of turbulent fluctuations without introducing any artificial damping. Efficient solution algorithms enable large-scale parallel computations with thousands of processors. Multi-physics packages such as sub-grid scale closures, combustion models, and droplet dynamics, are modified and enhanced to take advantage of the wealth of information provided by the direct representation of large scale turbulent motions. No adjustable coefficients are used and therefore no ad-hoc tuning is required.
The presentation will describe the CharLES computational tool and will provide examples of applications in several application areas, including gas-turbine combustion, noise prediction and multi-phase flows.
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22-23 October 2012 Pacengo del Garda 
