Setting limits on turbulence - balancing rigor with practicality

Tuesday, April 13, 2010 - 10:00am - 10:45am
EE/CS 3-180
Rich Kerswell (University of Bristol)
Keywords: Turbulent energy dissipation, eddy viscosity, stability

Abstract: Variational techniques have been successful in establishing limits on transport in turbulent flow systems (e.g heat in convection, mass in pressure-driven shear flow or momentum in boundary-driven flows). However, there is typically a significant discrepancy between the limit derived and observations as well as a disconnect between the theoretical `optimal flow' solution and what is actually seen. After giving examples of this, I will discuss some past work directed at closing this gap and motivate the use of plausible stability criteria.
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