Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence. Fang, L., Bos, W., J., T., & Jin, G., D. Physics of Fluids, 27(12):125102, 4, 2015.
Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence [link]Website  abstract   bibtex   
© 2015 AIP Publishing LLC. We show by direct numerical simulation (DNS) that the Lagrangian cross correlation of velocity gradients in homogeneous isotropic turbulence increases at short times, whereas its auto-correlation decreases. Kinematic considerations allow to show that two invariants of the turbulent velocity field determine the short-time velocity gradient correlations. In order to get a more intuitive understanding of the dynamics for longer times, heuristic models are proposed involving the combined action of local shear and rotation. These models quantitatively reproduce the effects and disentangle the different physical mechanisms leading to the observations in the DNS.
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 title = {Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence},
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 year = {2015},
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 abstract = {© 2015 AIP Publishing LLC. We show by direct numerical simulation (DNS) that the Lagrangian cross correlation of velocity gradients in homogeneous isotropic turbulence increases at short times, whereas its auto-correlation decreases. Kinematic considerations allow to show that two invariants of the turbulent velocity field determine the short-time velocity gradient correlations. In order to get a more intuitive understanding of the dynamics for longer times, heuristic models are proposed involving the combined action of local shear and rotation. These models quantitatively reproduce the effects and disentangle the different physical mechanisms leading to the observations in the DNS.},
 bibtype = {article},
 author = {Fang, L and Bos, W J T and Jin, G D},
 journal = {Physics of Fluids},
 number = {12}
}

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