Temporal dynamics of the alignment of the turbulent stress and strain rate
Joseph G. Ballouz, Perry L. Johnson, Nicholas T. Ouellette
Abstract
Energy transfer between scales in the turbulent cascade requires geometric alignment between scale-dependent turbulent stresses and strain rates. However, each of these tensors evolves dynamically and differently, leading to nontrivial temporal behavior of this alignment. A numerical simulation of turbulence is used to study this process and, by formulating the energy flux in a fully Lagrangian way, the important role played by deformation in the energy cascade is highlighted.
Topics & Concepts
TurbulenceCascadeEnergy cascadeMechanicsStress (linguistics)Dynamics (music)Statistical physicsDeformation (meteorology)Scale (ratio)PhysicsEnergy transferStrain rateClassical mechanicsFlux (metallurgy)Energy (signal processing)Materials scienceEngineeringAcousticsMeteorologyThermodynamicsEngineering physicsMetallurgyQuantum mechanicsChemical engineeringPhilosophyLinguisticsFluid Dynamics and Turbulent FlowsWind and Air Flow StudiesCombustion and flame dynamics