The dynamic model has been a path-breaking recent development in the field of Large-Eddy Simulation (LES) of turbulent flows. We briefly review the basic properties of the dynamic Smagorinsky model, with particular attention to its underlying assumption that the model coefficient is scale-invariant. Some applications where this assumption does not hold are discussed, among others simulations of wall-bounded flows that do not resolve the viscous sublayer. A new scale-dependent dynamic model is proposed, involving a secondary test-filter operation that allows one to probe from the simulated resolved field how the coefficient depends on scale. Applications to LES of a very high-Reynolds-number channel flow are presented, with comparisons to the results of the traditional dynamic model that assumes scale invariance of the coefficient.
|Title of host publication
|Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
|American Society of Mechanical Engineers (ASME)
|Number of pages
|Published - 1999
- large eddy simulation
- turbulent flow