3 Citations
Space-time modulation of turbulence in co-flow jets
- PhysicsInternational Journal of Heat and Fluid Flow
- 2020
Periodically Modulated Thermal Convection.
- PhysicsPhysical review letters
- 2020
Numerical simulations of Rayleigh-Bénard convection with time periodic modulation in the temperature boundary condition are performed and it is reported how this modulation can lead to a significant heat flux (Nusselt number Nu) enhancement.
References
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Direct numerical simulations are carried out to investigate scalar mixing in an isotropic turbulent flow with a time-periodic forcing. For high amplitudes of the modulation, it is shown that the…
Experimental observation of resonances in modulated turbulence
- PhysicsJournal of Fluid Mechanics
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The response of turbulence to a periodic forcing of the Reynolds number is studied. The turbulent flow is produced in a closed geometry between two counter-rotating disks. The time series of both the…
Response maxima in time-modulated turbulence: Direct numerical simulations
- Physics
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The response of turbulent flow to time-modulated forcing is studied by direct numerical simulations of the Navier-Stokes equations. The large-scale forcing is modulated via periodic energy input…
Turbulence modification by periodically modulated scale-depending forcing
- Environmental Science, Physics
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The response of the small scales of isotropic turbulence to periodic large scale forcing is studied using two-point closures. The frequency response of the turbulent kinetic energy and dissipation…
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- PhysicsPhysical review. E, Statistical, nonlinear, and soft matter physics
- 2003
Isotropic and homogeneous turbulence driven by an energy input modulated in time is studied within a variable range mean-field theory and at certain frequencies the amplitude of the response either almost vanishes or is strongly enhanced.
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- Physics, Environmental Science
- 1968
A diffusion approximation is derived for the transfer of spectral components of mean‐square fluctuations of a passive scalar quantity advected by an isotropic turbulent flow. This approximation,…
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- Physics
- 2009
We review studies of the statistics of isotropic turbulence in an incompressible fluid at high Reynolds numbers using direct numerical simulation (DNS) from the viewpoint of fundamental physics. The…
Effects of fluctuating energy input on the small scales in turbulence
- Physics, Environmental ScienceJournal of Fluid Mechanics
- 2013
Abstract In the standard cascade picture of three-dimensional turbulent fluid flows, energy is input at a constant rate at large scales. Energy is then transferred to smaller scales by an…
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- Physics
- 1967
A diffusion approximation is described to the nonlocal inertial energy transfer between wavenumber components in the spectral representation of an isotropic turbulent flow. The approximation yields…