Wind and boundary layers in Rayleigh-Bénard convection. II: Boundary layer character and scaling

Wind and boundary layers in Rayleigh-Bénard convection. I: Analysis and modeling

Direct simulation and regularization modeling of turbulent thermal convection

This dissertation focuses on turbulent thermal convection, which occurs in a wide range of geophysical and engineering situations, such as the atmosphere, the sun, the earth's mantle, indoor climates etc. The first part of the thesis comprises a fundamental study of Rayleigh-BÉnard convection in a domain with aspect-ratio four. An ensemble of...

Random Taylor hypothesis and the behavior of local and convective accelerations in isotropic turbulence

The properties of acceleration fluctuations in isotropic turbulence are studied in direct numerical simulations (DNS) by decomposing the acceleration as the sum of local and convective contributions (aL = ?u/?t and aC = u??u), or alternatively as the sum of irrotational and solenoidal contributions [aI = ??(p/?) and aS = ??2u]. The main emphasis...