On the Formulation of Lagrangian Stochastic Models for Geophysical Turbulent Flows

Guidelines for the formulation of Lagrangian stochastic models for particle simulations of single-phase and dispersed two-phase turbulent flows

Chaotic Lagrangian models for turbulent relative dispersion.

A deterministic multiscale dynamical system is introduced and discussed as a prototype model for relative dispersion in stationary, homogeneous, and isotropic turbulence. Unlike stochastic diffusion models, here trajectory transport and mixing properties are entirely controlled by Lagrangian chaos. The anomalous "sweeping effect," a known drawback common to kinematic simulations, is removed thr...

On the Well-Mixed Quasi-One-Dimensional Formulation of Lagrangian Stochastic Models for Turbulent Relative Dispersion

The derivation of Quasi-One-Dimensional Model for turbulent relative dispersion (Kurbanmuradov, Monte Carlo Methods and its applications, 3(1), 37-52, 1997) is reviewed and an error is detected. An estimation of the difference between the correct and the incorrect formulations is given in a very simplified turbulence. The correct formulation proves to behave more in agreement with results obtai...

Use of Stochastic Turbulence Models in Jet Acoustics

There are many approaches to determine the sound propagated from turbulent flows.  In hybrid methods, the turbulent noise source field is computed or modeled separately from the far-field calculations.  To have an initial and quick estimation of the sound propagation, less computationally intensive methods can be developed using stochastic models of the turbulent fluctuations.   In this paper, ...

History of Lagrangian Stochastic Models for Turbulent Dispersion

Lagrangian Mode Geophysical Mon © 2012. American 10.1029/2012GM This article briefly summarizes the historical evolution of the modern Lagrangian stochastic (LS) class of models for the calculation of fluid element (or particle) paths in turbulence. The fundamental advantages of a “first-order” LS model relative to alternative descriptions of turbulent dispersion are (1) its ability to correctl...