Recent progress and remaining challenges related to the understanding and prediction of turbulent flow are described. This is done by explaining the need for the development and basic features of unified turbulence models which integrate, recover and extend well known existing computational methods for turbulent flow calculations. The availability of unified turbulence models enables a signific...

Appropriate descriptions of turbulence are important in predicting sediment transport and seabed evolution. We use here a three-dimensional model to investigate the impacts of sediment-induced stratification, erosion parameterization, and turbulence closures on sediment transport and morphological simulations. The model is implemented in the Proudman Oceanographic Laboratory Coastal Ocean Model...

The paper shows the results of the convective heat transfer prediction in turbulent axisymmetric jets impinging onto a flat plate using the newest version (2006) of the k-ω turbulence model of Wilcox [1]. Improvements to the heat transfer predictions are obtained in the strongly strained flow regions with the impingement invariant proposed by Manceau [2] together with the F1 function proposed b...

Stably stratified turbulence presents particular challenges both from an experimental and a modeling perspective. The damping of the turbulence due to flow stratification and the presence of features such as gravity waves, and Kelvin-Helmholtz instabilities complicate the the application of turbulence similarity theories and the formulation of turbulence models. From an LES perspective, the mai...

The goal of this research is to investigate how well various turbulence models can describe physical properties of the upper convective boundary layer of the Sun. An accurate modeling of the turbulence motions is necessary for understanding the excitation mechanisms of solar oscillation modes. We have carried out realistic numerical simulations using several different physical Large Eddy Simula...

The ISM is a complex and highly dynamic system, and recent numerical modeling efforts have begun to take into account the effects of multiscale, timedependent processes, generically classified as “turbulence”. Turbulence transforms what would otherwise be a simple two-temperature state for atomic gas into a broader, but still bimodal, distribution; it also affects the relative proportions of ga...

This paper proposes a method to design wind turbulence model based on real spectral characteristics. It uses models Cole-Cole fractional functions approximate the power density. Von Kármán is most commonly used but originally designed for aircraft in high altitude. Therefore, it not suitable systems operating at low altitude, hence need more accurate these specific conditions. Shaping filters i...

--Most of the structures in flowing water are a challenge to their stability and sustainable with different flow conditions. Recent, renewable energy research and development covers ocean and river energy platform in which flow of water drag considered in various conversion devices towards the offshore and onshore establishment. Various energy platforms have been suggested for offshore developm...