Journal ArticleDOI
Criteria for the selection of stochastic models of particle trajectories in turbulent flows
TLDR
In this paper, the relationships between the various criteria are examined for a very general class of models and it is shown that most of the criteria are equivalent and also how a model can be designed to satisfy these criteria exactly and to be consistent with inertial-subrange theory.Abstract:
Many different random-walk models of dispersion in inhomogeneous or unsteady turbulence have been proposed and several criteria have emerged to distinguish good models from bad. In this paper the relationships between the various criteria are examined for a very general class of models and it is shown that most of the criteria are equivalent. It is also shown how a model can be designed to satisfy these criteria exactly and to be consistent with inertial-subrange theory. Some examples of models that obey the criteria are described. As an illustration some calculations of dispersion in free-convective conditions are presented.read more
Citations
More filters
Journal ArticleDOI
A comparison between two stochastic diffusion models in a complex three-dimensional flow
TL;DR: In this paper, a Random Displacement Model (RDM) and a Langevin Equation Model (LEM) are used to simulate point releases in a complex flow around a building.
Journal ArticleDOI
Plume rise and spread in buoyant releases from elevated sources in the lower atmosphere
Massimo Marro,Pietro Salizzoni,François-Xavier Cierco,Irène Korsakissok,Enrico Danzi,Lionel Soulhac +5 more
TL;DR: In this paper, the authors evaluate the reliability of a Lagrangian code to simulate the dispersion of a plume produced by pollutant emissions influenced by thermal and inertial phenomena.
Journal ArticleDOI
Lagrangian turbulence in the Adriatic Sea as computed from drifter data: Effects of inhomogeneity and nonstationarity
TL;DR: In this paper, the properties of mesoscale Lagrangian turbulence in the Adriatic Sea are studied from a drifter data set spanning 1990-1999, focusing on the role of inhomogeneity and nonstationarity.
Journal ArticleDOI
CFD simulation of bubbly flows: Random dispersion model
TL;DR: In this paper, a random dispersion model (RDM) is used to generate an instantaneous turbulent fluctuating velocity field by assuming that it is comprised of eddies, lifetimes and length scales of which can be deduced from local mean flow properties.
Journal ArticleDOI
Lagrangian simulation of wind transport in the urban environment
TL;DR: In this article, a Reynolds-averaged Navier-Stokes (RANS) model that explicitly resolves obstacles is used to compute trajectories in inhomogeneous urban-like flows.
References
More filters
Journal ArticleDOI
An Introduction to Probability Theory and Its Applications.
Journal ArticleDOI
Turbulence Structure in the Convective Boundary Layer
TL;DR: In this paper, a boundary layer experiment conducted over a flat site in northwestern Minnesota is discussed, where wind and temperature fluctuations near the ground were measured with AFCRL's fast-response instrumentation on a 32 m tower with MRU probes attached at five different heights to the tethering cable of a 1300 m2 kite balloon.
Book
Theory and Applications of Stochastic Differential Equations
Zeev Schuss,Robert O'Malley +1 more
TL;DR: Presents theory, sources, and applications of stochastic differential equations of Ito's type; those containing white noise; and the role of partial differential equations in this context.