Intermittency of turbulent velocity and scalar fields using three-dimensional local averaging
Dhawal Buaria, Katepalli R. Sreenivasan
Abstract
Spherical local averaging with respect to a scale size is a key concept to characterize multiscale interactions in fluid turbulence and to understand small-scale intermittency. However, past studies have mostly relied on one-dimensional surrogates or averaging in cubical domains due to various constraints. Utilizing a massive direct numerical simulation (DNS) database, we extract spherical local averages of energy dissipation rate, enstrophy, and scalar dissipation rate, and analyze their inertial range intermittency as a function of both Reynolds number and Schmidt number.
Topics & Concepts
IntermittencyTurbulenceReynolds numberDirect numerical simulationScalar (mathematics)DissipationStatistical physicsEnstrophyMechanicsPhysicsInertial frame of referenceScale (ratio)ScalingRange (aeronautics)Classical mechanicsMathematicsGeometryMaterials scienceVorticityVortexThermodynamicsQuantum mechanicsComposite materialFluid Dynamics and Turbulent FlowsParticle Dynamics in Fluid FlowsWind and Air Flow Studies