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Showing 1 to 5 of 5 for “"velocity gradient tensor"”.

  1. Self-Sustaining Formation of Packets of Hairpin Vortices in a Turbulent Wall Layer

    Zhou, JigenUniversity of Illinois at Urbana-Champaign2015

    … aligns with the local real eigenvector of the velocity gradient tensor field over almost the entire region occupied by the vortex. By using this feature, the backbone of a vortex can be constructed efficiently.

    uiuc Repository record

  2. Multiscale simulation of viscoelastic flows : applications to kinetic theory models of polymer melts and liquid crystalline polymers

    Suen, Jason Ka-Chun, 1973-Massachusetts Institute of Technology2003

    … a mixed finite element method to calculate the velocity field, with stress tensor evaluated by using a stochastic simulation method. This so-called CONNFFESSIT approach suffers from both a large memory requirement and stochastic noise. This thesis focuses on the development and application of a …

    mit Repository record

  3. Lagrangian dispersion and deformation in submesoscale flows

    Essink, SebastianMassachusetts Institute of Technology and Woods Hole Oceanographic Institution2019

    … theoretical expectations, we find that nonlocal velocity gradients associated with mesoscale eddies dominate the separation of drifters even at the kilometer scale. At submeso-scales, we observe energetic motions, such as near-inertial oscillations, that contribute to the energy spectrum but are …

    woods-hole Repository record

  4. 2D PIV Study of Grid Turbulence

    Cardesa Dueñas, José IgnacioUniversity of Cambridge2012

    … that allows for a direct measurement of velocity derivative statistics. Two-dimensional particle image velocimetry ($2D~PIV$) of highly resolved grid turbulence at $Re_{M}=U_{\infty}M/\nu = 16000$ where $M$ is the grid rod spacing was analysed. Data spanning the downstream range $65 < x/M …

    cambridge Repository record

  5. A methodology based on local resolution of turbulent structures for effective modeling of unsteady flows

    Lenci, GiancarloMassachusetts Institute of Technology2016

    … value of the second invariant of the resolved velocity gradient tensor. The variable retains several useful properties, including the capability to describe scale separation, deformation, shear flow, and coherent structures (thus motivating the name STRUCT adopted for the new approach). The …

    mit Repository record