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Direct Assessment of Vorticity Alignment with Local and Nonlocal Strain Rates in Turbulent Flows
Peter E. Hamlington, Jörg Schumacher, Werner J. A. Dahm
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…
Multiscale modelling strategy using the lattice Boltzmann method for polymer dynamics in a turbulent flow
Jonghoon Lee, Burkhard Duenweg, Joerg Schumacher
Polymer dynamics in a turbulent flow is a problem spanning several orders of magnitude of length and time scales. A microscopic simulation covering all those scales from the polyme…
Lagrangian dispersion and heat transport in convective turbulence
Joerg Schumacher
Lagrangian studies of the local temperature mixing and heat transport in turbulent Rayleigh-Benard convection are presented, based on three-dimensional direct numerical simulations…
Local and Nonlocal Strain Rate Fields and Vorticity Alignment in Turbulent Flows
Peter E. Hamlington, Jörg Schumacher, Werner J. A. Dahm
Local and nonlocal contributions to the total strain rate tensor at any point in a flow are formulated from an expansion of the vorticity field in a local spherical neighborhood of…