The relationship between mean and instantaneous structure in turbulent passive scalar plumes

Crimaldi, John P.; Wiley, Megan B.; Koseff, Jeffrey R.

doi:10.1088/1468-5248/3/1/014

Cited by 91 publications

(98 citation statements)

References 16 publications

(28 reference statements)

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“…The dye solution is pumped at a volumetric rate of 3 ml/ min, resulting in a vertical exit velocity of 0.063 cm/s. Further details of the flume design can be found in Crimaldi et al (10).…”

Section: Methodsmentioning

confidence: 99%

“…Details of the imaging apparatus, image acquisition, and image processing are given by Crimaldi and Koseff (1) and Crimaldi et al (10). Images were acquired at various locations in both horizontal and vertical planes aligned parallel to the flow.…”

Section: Methodsmentioning

confidence: 99%

“…Portions of the dataset presented in the present paper have been published in an earlier work by Crimaldi et al (10). The earlier work examined the relationship between the instantaneous and mean scalar structure for a single flow case.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structure of turbulent plumes from a momentumless source in a smooth bed

Crimaldi

Koseff

2006

Environ Fluid Mech

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The spatial development of a passive scalar plume is studied within the inhomogeneous turbulence of a boundary layer flow in a recirculating laboratory flume with a smooth bed. The source of the scalar is located flush with the bed, and the low-momentum source design is intended to simulate a diffusive-type scalar release. A weakly diffusive fluorescent dye is used as the scalar. Planar laser-induced fluorescence (PLIF) techniques were used to record the structure of the plume at a spatial resolution of 150 µm. The measured structure of the mean concentration field is compared to an analytical solution for shear-free, homogeneous turbulence. The laboratory plume exhibits spatial development in the mean concentration field that deviates from the self-similar behavior predicted by the analytical solution; this deviation is due to the mean shear and inhomogeneity of the turbulence. In particular, the influence of the viscous sublayer on the plume development is seen to be significant. Nonetheless, the analytical solution replicates some of the features seen in the laboratory plume, and the solution suggests methods of reducing the laboratory data even for cases where the results deviate from the analysis. We also examine the spatial development of the root-mean-square (rms) fluctuating concentration field, and use scalar probability density functions to examine the relationship between the mean and fluctuating concentrations.

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“…The dye solution is pumped at a volumetric rate of 3 ml/ min, resulting in a vertical exit velocity of 0.063 cm/s. Further details of the flume design can be found in Crimaldi et al (10).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Structure of turbulent plumes from a momentumless source in a smooth bed

Crimaldi

Koseff

2006

Environ Fluid Mech

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“…As the flow carries patches of odor, the average concentration within a patch decreases away from the source, and the average time between successive patches increases. The instantaneous odor concentration strongly fluctuates intermittently with peaks up to three orders of magnitude above the average concentration value [7] (Fig. 1 presents the nature of an odor plume at different scales).…”

Section: Introductionmentioning

confidence: 99%

“…A. mean structure, B. instantaneous structure, and C. instantaneous slice. Picture is adapted from [7].…”

Section: Introductionmentioning

confidence: 99%

Optimal Swarm Formation for Odor Plume Finding

Marjovi

Marques

2014

IEEE Trans. Cybern.

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Abstract-This paper presents an analytical approach to the problem of odor plume finding by a network of swarm robotic gas sensors and finds an optimal configuration for them, given a set of assumptions. Considering cross-wind movement for the swarm, we found that the best spatial formation of robots in finding odor plumes is diagonal line configuration with equal distance between each pair of neighboring robots. We show that the distance between neighboring pairs in the line topology depends mainly on the wind speed and the environmental conditions, whereas, the number of robots and the swarm's crosswind movement distance do not show significant impact on optimal configurations. These solutions were analyzed and verified by simulations and experimentally validated in a reduced scale realistic environment using a set of mobile robots.

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Paleoneurology of Baurusuchus (Crocodyliformes: Baurusuchidae), ontogenetic variation, brain size, and sensorial implications

Dumont

Santucci

Andrade

et al. 2020

The Anatomical Record

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Knowledge on crocodyliform paleoneurology has significantly improved with development of computed tomography. However, studies so far have been able to reconstruct brain endocasts based only on single specimens for each taxon. Here for the first time, we reconstructed brain endocasts for multiple fossil specimens of the same crocodyliform taxon (Baurusuchus), consisting of complete skulls of two medium sized specimens, one large adult, and a late juvenile. In addition, we were able to reconstruct the inner ear anatomy of a fragmentary skull using microtomography. We present estimates of brain size using simple models, based on modern Crocodylia, able to adapt brain to endocranial cavity ratios to expected ontogenetic variation instead of using fixed ratios. We also analyzed relative brain sizes, olfactory ratios, facial sensation, alert head posture, best hearing frequencies, and hearing range. The calculated endocranial volumes showed that they can be greatly altered by taphonomic processes, altering both total and partial endocranial volumes. Reconstructed endocasts are compatible with different degrees of occupation along the endocranial cavity and some of their characteristics might be useful as phylogenetic characters. The relative brain size of Baurusuchus seems to be small in comparison to modern crocodilians. Sensorial abilities were somewhat similar to modern crocodilians and hearing ranges and best mean frequencies remarkably similar to modern taxa, whereas olfactory ratio values are a little higher. Differing from its modern relatives, Baurusuchus hypothesized alert head posture is compatible with a terrestrial habit.

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The relationship between mean and instantaneous structure in turbulent passive scalar plumes

Cited by 91 publications

References 16 publications

Structure of turbulent plumes from a momentumless source in a smooth bed

Structure of turbulent plumes from a momentumless source in a smooth bed

Optimal Swarm Formation for Odor Plume Finding

Paleoneurology of Baurusuchus (Crocodyliformes: Baurusuchidae), ontogenetic variation, brain size, and sensorial implications

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