Internal variability of stratiform clouds is manifested on grid scales ranging from cloud resolving models to general circulation models, and its accurate formulation is one of the most important tasks in improvement of model predictions. Understanding cloud variability on different scales will help develop and improve subgrid-scale cloud parameterizations. Information about variability is also...

We present a variational multiscale mixed finite element method for the solution of Darcy flow in porous media, in which both the permeability field and the source term display a multiscale character. The formulation is based on a multiscale split of the solution into coarse and subgrid scales. This decomposition is invoked in a variational setting that leads to a rigorous definition of a (glob...

Large eddy simulation with filtered-structure-function subgrid model and implicit large eddy simulation (ILES without explicit subgrid model) using high-order accuracy and high resolution compact scheme have been performed on the tip vortex shedding from a rectangular half-wing with a NACA 0012 airfoil section and a rounded wing tip. The formation of the tip vortex and its initial development i...

Extensive experimental evidence highlights that scalar turbulence exhibits anomalous diffusion and stronger intermittency levels at small scales compared to in fluid turbulence. This renders the corresponding subgrid-scale dynamics modeling for a greater challenge date. We develop new large eddy simulation (LES) paradigm efficiently dynamically nonlocal LES of To this end, we formulate underlyi...

Since its rst application, the dynamic procedure has been recognized as an eeec-tive means to compute rather than prescribe the unknown coeecients that appear in a subgrid-scale model for Large-Eddy Simulation (LES). The dynamic procedure (Germano et al. 1991; Ghosal et al. 1995) is usually used to determine the non-dimensional coeecient in the Smagorinsky (1963) model. In reality the procedure...

Abstract. Complex distributions of aerosol properties evolve in space and time as a function emissions, new particle formation, coagulation, condensational growth, chemical transformation, phase changes, turbulent mixing transport, removal processes, ambient meteorological conditions. The ability transport models to represent the multi-scale processes affecting life cycle aerosols depends on th...

This paper describes a new method for parameterizing the conversion of convective cloud liquid water to rainfall (‘‘autoconversion’’) that can be used within large-scale climatemodels, and evaluates the newmethod using the Regional Climate Model, version 3 (RegCM3), coupled to the land surface scheme Integrated Biosphere Simulator (IBIS). The new method is derived from observed distributions of...