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!! Reacting Flow [./FlamePropagation.jpg|right][./spray.jpg|right] The next generation of turbulence modelling in computational fluid dynamics (CFD) will be LES. For the appropriate applications, such as reacting flows, LES can offer significant advantages over traditional Reynolds Averaged Navier Stokes (RANS) modelling approaches. The main advantage of LES over computationally cheaper RANS is the increased level of detail that LES can deliver. While RANS provides “averaged” results, LES can predict instantaneous flow characteristics and resolve turbulent flow structures. In engine research, this is particularly valuable in simulations involving chemical reactions. While the “averaged” concentration of chemical species may be too low to trigger a reaction, there can be localized areas of high concentration in which reactions will occur. LES is also significantly more accurate than RANS for flows involving flow separation or acoustic prediction. Thus, LES can be used to study cycle-to-cycle variability, provide more design sensitivity for investigating both geometrical and operational changes, and produce more detailed and accurate results. As inexpensive computing power increases, the ability to use LES in applications is increasing.
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