Formation of Large-Scale Semi-Organized Structures in Turbulent Convection
arXiv:astro-ph/0210452 · doi:10.1103/PhysRevE.66.066305
Abstract
A new mean-field theory of turbulent convection is developed. This theory predicts the convective wind instability in a shear-free turbulent convection which causes formation of large-scale semi-organized fluid motions in the form of cells or rolls. Spatial characteristics of these motions, such as the minimum size of the growing perturbations and the size of perturbations with the maximum growth rate, are determined. This study predicts also the existence of the convective shear instability in a sheared turbulent convection which results in generation of convective shear waves with a nonzero hydrodynamic helicity. Increase of shear promotes excitation of the convective shear instability. Applications of the obtained results to the atmospheric turbulent convection and the laboratory experiments on turbulent convection are discussed. This theory can be applied also for the describing a mesogranular turbulent convection in astrophysics.
arXiv comment16 pages, 10 figures, REVTEX4, PHYSICAL REVIEW E, v. 67, in press (2003)
References in corpus (3)
Cited by in corpus (28)
- Energy- and flux-budget (EFB) turbulence closure model for the stably stratified flows. Part I: Steady-state, homogeneous regimes
- Turbulence energetics in stably stratified geophysical flows: strong and weak mixing regimes
- Magnetic fluctuations and formation of large-scale inhomogeneous magnetic structures in a turbulent convection
- Generation of Large-Scale Vorticity in a Homogeneous Turbulence with a Mean Velocity Shear
- Large-scale instability in a sheared nonhelical turbulence: formation of vortical structures
- Tangling clustering of inertial particles in stably stratified turbulence
- Magnetic flux concentrations from turbulent stratified convection
- Effect of large-scale coherent structures on turbulent convection
- Hysteresis phenomenon in turbulent convection
- Enhancement of small-scale turbulent dynamo by large-scale shear
- Internal gravity waves in the energy and flux budget turbulence-closure theory for shear-free stably stratified flows
- Transition phenomena in unstably stratified turbulent flows
- Large-scale instabilities in a non-rotating turbulent convection
- The energy- and flux budget theory for surface layers in atmospheric convective and stably stratified turbulence
- Turbulent Fluxes in Stably Stratified Boundary Layers
- Effect of heat flux on differential rotation in turbulent convection
- Excitation of large-scale inertial waves in a rotating inhomogeneous turbulence
- Energy Conservation and Second-Order Statistics in Stably Stratified Turbulent Boundary Layers
- Mixing at the external boundary of a submerged turbulent jet
- Generation of large-scale vorticity in rotating stratified turbulence with inhomogeneous helicity: mean-field theory
- Budget equations and astrophysical nonlinear mean-field dynamos
- Magnetic fields of low-mass main sequences stars: Nonlinear dynamo theory and mean-field numerical simulations
- Large-scale circulations in a shear-free convective turbulence: Mean-field simulations
- Large-scale clustering of inertial particles in a rotating, stratified and inhomogeneous turbulence
- Semi-organized structures and turbulence in the atmospheric convection
- Generation of a large-scale vorticity in a fast rotating density stratified turbulence or turbulent convection
- Estimates of current helicity and tilt of solar active regions and Joy's law
- Compressibility effects in a turbulent transport of temperature field