A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress length variable which the structural ensemble dynamics (SED) theory predicts. The ZEM distinguished by obvious physical parameters, quantifying underlying flow domain universal multi-layer structure. SED also utilized to formulate anisotropic Bradshaw stress-intensity factor, parameterized eddy-to-lamin...

In this paper, we study the boundedness of atmospheric Ekman flows with classical boundary conditions. We consider system a two-layer eddy viscosity, consisting constant viscosity in upper layer and continuous lower layer. analyze solution by using logarithmic matrix norm.

Convection of an electrically conducting fluid in a rotating system represents a basic dynamical process in planetary interiors and in stars. Astrophysicists and geophysicists have long been interested in the mechanisms that govern the convective heat transport and the generation of magnetic fields by convection in those systems. The availability in recent years of large scale computer capaciti...

A Semi-explicit Large Eddy Simulation (SeLES) is proposed to help handle interactions between discontinuities and turbulence when using conventional Sub-Grid Scale (SGS) models of large eddy simulation. For the grid-scale simulation, numerical viscosity becomes effective in limited region detected by discontinuity sensor, whereas a central difference scheme applied elsewhere. In our SeLES, disc...

This paper introduces a new approach to Large-Eddy Simulation (LES) where subgrid-scale (SGS) dissipation is applied proportionally to the degree of local spectral broadening, hence mitigated or deactivated in regions dominated by large-scale and/or laminar vortical motion. The proposed coherentvorticity preserving (CvP) LES methodology is based on the evaluation of the ratio of the test-filter...

Recent data-driven efforts have utilized spectral decomposition techniques to uncover the geometric self-similarity of dominant motions in logarithmic layer, and thereby validate attached eddy model. In this paper, we evaluate predictive capability stochastically forced linearized Navier–Stokes equations capturing such structural features turbulent channel flow at $Re_\tau =2003$ . We use linea...

Large Eddy Simulation (LES) has become an increasingly attractive option for turbulence modeling due to the rise in computing power and the improvement in sub-grid scale (SGS) parameterizations. This study tests the improvements in simulations of wall-bounded flows over heterogeneous surfaces attained by the implementation of three improvements in the eddy-viscosity SGS closure: the dynamic mod...