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
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Journal ArticleDOI
Experimental investigation and CFD modelling of flow, sedimentation, and solids separation in a combined sewer detention tank
TL;DR: In this paper, the use of 3D computational fluid dynamics (CFD) is investigated for studying flow, sedimentation, and solids separation in a tank equipped with one inlet pipe and two outlets (outlet pipe, overflow weir).
Journal ArticleDOI
Fluxes of carbon dioxide and water vapour over Scots pine forest and clearing
Üllar Rannik,Nuria Altimir,Jukka Raittila,Tanja Suni,Anca Gaman,Tareq Hussein,Teemu Hölttä,Hannu Lassila,Maria Latokartano,Antti Lauri,Anas Natsheh,Tuukka Petäjä,Riikka Sorjamaa,Hanna Ylä-Mella,Petri Keronen,Frank Berninger,Timo Vesala,Pertti Hari,Markku Kulmala +18 more
TL;DR: In this paper, the authors measured CO2 and water vapour fluxes by the eddy covariance (EC) technique from July to September 2000 at two closely located sites in southern Finland: over a 38-year old pine forest and over a 5-year-old forest clearing.
Journal ArticleDOI
Stochastic Lagrangian models of velocity in homogeneous turbulent shear flow
TL;DR: In this paper, a general linear model is examined for the important case of homogeneous turbulent shear flow, for which there are recent direct numerical simulation (DNS) data on Lagrangian statistics.
Journal ArticleDOI
A lagrangian dispersion model for calculating concentration distribution within a built-up domain
H. Kaplan,N. Dinar +1 more
TL;DR: In this paper, a 3D Lagrangian diffusion model in a nonhomogeneous field is applied to calculate the pollutant distribution between the buildings and several examples are studied and compared to wind tunnel measurements.
Journal ArticleDOI
Smelling Nano Aerial Vehicle for Gas Source Localization and Mapping
TL;DR: The main conclusion of this paper is that a nano-drone has the potential to perform gas sensing tasks in complex environments.
References
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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.