On the Lamb vector divergence in Navier–Stokes flows
- 8 August 2008
- journal article
- research article
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 610, 261-284
- https://doi.org/10.1017/s0022112008002760
Abstract
The mathematical and physical properties of the Lamb vector divergence are explored. Toward this aim, the instantaneous and mean dynamics of the Lamb vector divergence are examined in several analytic and turbulent flow examples relative to its capacity to identify and characterize spatially localized motions having a distinct capacity to effect a time rate of change of momentum. In this context, the transport equation for the Lamb vector divergence is developed and shown to accurately describe the dynamical mechanisms by which adjacent high- and low-momentum fluid parcels interact to effect a time rate of change of momentum and generate forces such as drag. From this, a transport-equation-based framework is developed that captures the self-sustaining spatiotemporal interactions between coherent motions, e.g. ejections and sweeps in turbulent wall flows, as predicted by the binary source–sink distribution of the Lamb vector divergence. New insight into coherent motion development and evolution is found through the analysis of the Lamb vector divergence.This publication has 43 references indexed in Scilit:
- Steady vortex force theory and slender-wing flow diagnosisActa Mechanica Sinica, 2007
- On the physical mechanisms of drag reduction in a spatially developing turbulent boundary layer laden with microbubblesJournal of Fluid Mechanics, 2004
- Is concentrated vorticity that important?European Journal of Mechanics - B/Fluids, 1998
- Direct numerical simulation of turbulent flow over ribletsJournal of Fluid Mechanics, 1993
- The Proper Orthogonal Decomposition in the Analysis of Turbulent FlowsAnnual Review of Fluid Mechanics, 1993
- Coherent Motions in the Turbulent Boundary LayerAnnual Review of Fluid Mechanics, 1991
- On the existence of localized rotational disturbances which propagate without change of structure in an inviscid fluidJournal of Fluid Mechanics, 1986
- Magnetostatic equilibria and analogous Euler flows of arbitrarily complex topology. Part 2. Stability considerationsJournal of Fluid Mechanics, 1986
- A proposed model of the bursting process in turbulent boundary layersJournal of Fluid Mechanics, 1975
- Report on the I.U.T.A.M. symposium on concentrated vortex motions in fluidsJournal of Fluid Mechanics, 1965