Journal
PHYSICS OF FLUIDS
Volume 20, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3021055
Keywords
flow simulation; integration; numerical analysis; turbulence; vortices
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Funding
- Air Force Research Laboratory (AFRL) [FA8650-06-2-3625]
- National Aeronautics & Space Administration (NASA) Marshall and Glenn Research Centers under the NASA Constellation University Institutes Project (CUIP) [NCC3-989]
- German Academic Exchange Service (DAAD)
- Deutsche Forschungsgemeinschaft (DFG)
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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 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 nonlocal strain rate. This, in turn, reveals a significant linear contribution to the vortex stretching dynamics in turbulent flows. (c) 2008 American Institute of Physics.
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