Direct Assessment of Vorticity Alignment with Local and Nonlocal Strain Rates in Turbulent Flows
arXiv:0810.3439 · doi:10.1063/1.3021055
Abstract
A direct Biot-Savart integration is used to decompose the strain rate into its local and nonlocal constituents, allowing the vorticity alignment with the local and nonlocal strain rate eigenvectors to be investigated. These strain rate tensor constituents are evaluated in a turbulent flow using data from highly-resolved direct numerical simulations. While the vorticity aligns preferentially with the intermediate eigenvector of the \textit{combined} strain rate, as has been observed previously, the present results for the first time clearly show that the vorticity aligns with the most extensional eigenvector of the \textit{nonlocal} strain rate. This in turn reveals a significant linear contribution to the vortex stretching dynamics in turbulent flows.
arXiv comment5 pages, 5 figures, to appear as a Letter in Physics of Fluids
References in corpus (2)
Cited by in corpus (21)
- Alignment of vorticity and rods with Lagrangian fluid stretching in turbulence
- Vortex stretching and enstrophy production in high Reynolds number turbulence
- Self-attenuation of extreme events in Navier-Stokes turbulence
- Stagnation points control chaotic fluctuations in viscoelastic porous media flow
- Extreme vorticity growth in Navier-Stokes turbulence
- Transient solute transport with sorption in Poiseuille flow
- Invariant Data-Driven Subgrid Stress Modeling in the Strain-Rate Eigenframe for Large Eddy Simulation
- Generation of intense dissipation in high Reynolds number turbulence
- Characterization of velocity-gradient dynamics in incompressible turbulence using local streamline geometry
- Non-local amplification of intense vorticity in turbulent flows
- Role of pressure in generation of intense velocity gradients in turbulent flows
- Twisting vortex lines regularize Navier-Stokes turbulence
- Scaling of locally averaged energy dissipation and enstrophy density in isotropic turbulence
- Local precursors to anomalous dissipation in Navier-Stokes turbulence: Burgers vortex-type models and simulation analysis
- Viscous vortex layers subject to more general strain and comparison to isotropic turbulence
- Experimental measurement of the vorticity-strain alignment around extreme energy transfer events
- Space-local Navier--Stokes turbulence
- Correlation and decomposition framework for identifying and disentangling flow structures: canonical examples and application to isotropic turbulence
- Locality of vortex stretching for the 3D Euler equations
- Extending the Duchon-Robert framework for anomalous dissipation to compressible fluid flows
- Orientation Dynamics of Gyrotactic Microswimmers in Turbulent Flows