Second-order closure models for rotating turbulent flows
نویسندگان
چکیده
منابع مشابه
Time scales of stratified turbulent flows and relations between second- order closure parameters and flow numbers
The description of turbulent mixing and chemical reactions by Lagrangian probability density function methods offers some significant advantages over other methods, mainly due to the simulation of mixing processes and the exact treatment of chemical transformations. A key problem of such methods is the information on the time scales of processes, because they determine the dynamics and intensit...
متن کاملLarge numerical simulations of turbulent rotating flows
Scientific context Rotation, as measured by the Rossby number (the ratio of the rotation period to the eddy turn over time) is present in astroand geophysics. For example, the high Reynolds number large scales of atmospheric and oceanic flows are affected by the rotation of the Earth; the Rossby number Ro = U0/[L0Ω] for mid-latitude atmospheric synoptic scales is Ro ≈ 0.1 whereas in the solar c...
متن کاملSelf-Energy Closure for Inhomogeneous Turbulent Flows and Subgrid Modeling
A new statistical dynamical closure theory for general inhomogeneous turbulent flows and subgrid modeling is presented. This Self-Energy (SE) closure represents all eddy interactions through nonlinear dissipation or forcing ‘self-energy’ terms in the mean-field, covariance and response function equations. This makes the renormalization of the bare dissipation and forcing, and the subgrid modeli...
متن کاملModelling transonic flows with second-moment closure
It is now generally accepted that statistical turbulence models are unlikely, ever, to enable highfidelity predictions of massively-separated flows, especially if separation occurs from curved three-dimensional surfaces. In such circumstances, even the most elaborate turbulence models are ill-equipped to capture the dynamics associated with highly-unsteady and intense large-scale motions that a...
متن کاملCoherent Structures and Extreme Events in Rotating Multiphase Turbulent Flows
By using direct numerical simulations (DNS) at unprecedented resolution, we study turbulence under rotation in the presence of simultaneous direct and inverse cascades. The accumulation of energy at large scale leads to the formation of vertical coherent regions with high vorticity oriented along the rotation axis. By seeding the flowwithmillions of inertial particles,wequantify—for the first t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Quarterly of Applied Mathematics
سال: 1987
ISSN: 0033-569X,1552-4485
DOI: 10.1090/qam/917022