Turbulent Prandtl number from isotropically forced turbulence

Review Mathematics, Applied

Similarities between characteristics of convective turbulence in confined and extended domains

Ambrish Pandey et al.

Summary: This passage explores turbulent convection characteristics in slender cells and finds that fluctuations weaken with increasing Pr, while intermittency increases.

PHYSICA D-NONLINEAR PHENOMENA (2022)

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Article Mechanics

Convective mesoscale turbulence at very low Prandtl numbers

Ambrish Pandey et al.

Summary: This study investigates turbulent convection under different Prandtl numbers and Rayleigh numbers using numerical simulations and massive parallel computations. The study reports the global properties of heat and momentum transport, vertical profiles of temperature and fluctuations, as well as kinetic energy and thermal dissipation rates. The study also finds similarities between mesoscale turbulence and classical homogeneous isotropic turbulence. Possible implications for subgrid-scale parameterization of turbulent convection are discussed.

JOURNAL OF FLUID MECHANICS (2022)

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Article Physics, Fluids & Plasmas

Heat flux in turbulent Rayleigh-Benard convection: Predictions derived from a boundary layer theory

N. C. Tai et al.

Summary: Using a closed set of boundary layer equations, analytical results for the dependence of heat flux on Reynolds and Prandtl numbers and parameters measuring fluctuations in turbulent Rayleigh-Benard convection are derived. The similarity in scaling dependencies of heat flux in steady forced convection and turbulent Rayleigh-Benard convection has been revealed, solving a puzzle in our understanding of heat transfer in the latter.

PHYSICAL REVIEW FLUIDS (2021)

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Article Physics, Fluids & Plasmas

Non-Boussinesq convection at low Prandtl numbers relevant to the Sun

Ambrish Pandey et al.

Summary: This study examines convection in the Sun at high Rayleigh numbers and low Prandtl numbers, and finds that turbulent Prandtl number (Prt) increases with decreasing Pr in both Oberbeck-Boussinesq (OB) and non-Oberbeck-Boussinesq (NOB) convection scenarios. This suggests that convective flows in astrophysical settings behave effectively as in high-Prandtl-number turbulence.

PHYSICAL REVIEW FLUIDS (2021)

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Article Astronomy & Astrophysics