23 citations · 24 across the 2 of their papers we have counts for
7 papers · 1 filter
On the role of vorticity stretching and strain self-amplification in the turbulence energy cascade
Perry L. Johnson
The tendency of turbulent flows to produce fine-scale motions from large-scale energy injection is often viewed as a scale-wise cascade of kinetic energy driven by vorticity stretc…
Identifying and tracking bubbles and drops in simulations: a toolbox for obtaining sizes, lineages, and breakup and coalescence statistics
Wai Hong Ronald Chan, Michael S. Dodd, Perry L. Johnson +1
Knowledge of bubble and drop size distributions in two-phase flows is important for characterizing a wide range of phenomena, including combustor ignition, sonar communication, and…
The turbulent bubble break-up cascade. Part 2. Numerical simulations of breaking waves
Wai Hong Ronald Chan, Perry L. Johnson, Parviz Moin +1
Breaking waves generate a distribution of bubble sizes that evolves over time. Knowledge of how this distribution evolves is of practical importance for maritime and climate studie…
The turbulent bubble break-up cascade. Part 1. Theoretical developments
Wai Hong Ronald Chan, Perry Johnson, Parviz Moin
Breaking waves entrain gas beneath the surface. The wave-breaking process energizes turbulent fluctuations that break bubbles in quick succession to generate a wide range of bubble…
On the evolution of the velocity gradient tensor in transitional boundary layers
Ahmed Elnahhas, Perry L. Johnson, Adrián Lozano-Durán +1
We study the transition to turbulence from the perspective of the velocity gradient tensor dynamics. Our work is motivated by the observation of nonlinear structures emerging durin…
Energy transfer from large to small scales in turbulence by multi-scale nonlinear strain and vorticity interactions
Perry L. Johnson
An intrinsic feature of turbulent flows is an enhanced rate of mixing and kinetic energy dissipation due to the rapid generation of small-scale motions from large-scale excitation.…