caa a22 4500 475777522 CHVBK 20180406123635.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1023/A:1002457317568 doi (NATIONALLICENCE)springer-10.1023/A:1002457317568 A Comparison Of The Detailed Structure In Dispersing Tracer Plumes Measured In Grid-Generated Turbulence With A Meandering Plume Model Incorporating Internal Fluctuations [Elektronische Daten] [Eugene Yee, David Wilson] A meandering plume model that explicitly incorporatesinternal fluctuations has been developed and used to model the evolutionof concentration fluctuations in point-source plumes in grid turbulenceobtained from a detailed water-channel simulation. This fluctuating plumemodel includes three physical parameters: the mean plume spread in fixedcoordinates, which represents the outer plume length scale; the meaninstantaneous plume spread in coordinates attached to the instantaneousplume centroid, which represents the inner plume length scale; and, theconcentration fluctuation intensity in the meandering reference frame,which represents the in-plume fluctuation scale. These parameters arespecified in terms of a set of coupled dynamical equations that modeltheir development with downstream distance from the source. Explicitexpressions for the concentration moments of arbitrary integral orderand the concentration probability density function have been obtainedfrom the fluctuating plume model. Detailed comparisons of model predictionsagainst water-channel measurements for the first four concentrationmoments and the concentration probability distributions generally showvery good overall quantitative agreement. Exact quantitative conditions,expressed in terms of the physical parameters of the fluctuating plumemodel, have been derived for the emergence of off-centreline peaks inthe concentration variance profile. These quantitative conditions havebeen illustrated in terms of a diagram of states of the dispersing plume,and the qualitatively different regimes of plume concentration variancebehaviour on this state diagram have been identified and characterized. Kluwer Academic Publishers, 2000 Plume dispersion nationallicence Concentration fluctuations nationallicence Grid turbulence nationallicence Water-channel simulation nationallicence Fluctuating plume model nationallicence Yee Eugene Defence Research Establishment Sheffield, P.O. Box 4000, T1A 8K6, Medicine Hat, Alberta, Canada aut Wilson David Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, Alberta, Canada aut Boundary-Layer Meteorology Kluwer Academic Publishers 94/2(2000-02-01), 253-296 0006-8314 94:2<253 2000 94 10546 https://doi.org/10.1023/A:1002457317568 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002457317568 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yee Eugene Defence Research Establishment Sheffield, P.O. Box 4000, T1A 8K6, Medicine Hat, Alberta, Canada aut NATIONALLICENCE 700 1- Wilson David Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, Alberta, Canada aut NATIONALLICENCE 773 0- Boundary-Layer Meteorology Kluwer Academic Publishers 94/2(2000-02-01), 253-296 0006-8314 94:2<253 2000 94 10546 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer