Adaptive Large Eddy Simulation
نویسنده
چکیده
This project is focused on development of a novel approach, called Stochastic Coherent Adaptive Large Eddy Simulation (SCALES) for modeling and simulation of turbulent flows. The approach comes from the realization of the deficiency of the current Large Eddy Simulation (LES) approach, which resolves only the large-scale motions instead of coherent energy containing flow structures. The SCALES approach addresses the shortcomings of LES by using a dynamic grid adaptation strategy that is capable to resolve and track the most energetic coherent structures in a turbulent flow field. Similarly to classical LES the effect of the unresolved motions is modeled in SCALES. A number of localized dynamic subgrid scale models utilizing wavelet multi-resolution analysis have been developed and successfully tested for freely decaying homogeneous turbulence with initial Reλ =72. It has been shown that the SCALES results obtained with less than 0.4% of the total non-adaptive computational nodes closely match reference data from direct numerical simulation. In contrast to classical LES, where the energetic small scales are poorly simulated, the agreement holds not only in terms of global statistical quantities but also in terms of spectral distribution of energy and, more importantly, enstrophy up to the dissipative wavenumber range.
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Investigations of Three- Dimensional Turbulent Cavity Flow Using Large Eddy Simulation Approach
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تاریخ انتشار 2007