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A multi-site, year-round turbulence microstructure atlas for the deep perialpine Lake Garda
2021
Scientific Data
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Turbulence quantities were estimated, quality-checked, and merged with water quality and meteorological data to produce a unique turbulence atlas for a lake. ...
The dataset is open to a wide range of possible applications, including research on the variability of turbulent mixing across seasons and sites (demersal vs pelagic zones) and driven by different factors ...
The percentage of estimates that are scattered within a factor of 2.8 and 10 are reported in the corresponding panels, along with the coefficient of determination R 2 of a linear regression model. ...
doi:10.1038/s41597-021-00965-0
pmid:34294730
pmcid:PMC8298655
fatcat:35k4iwalpzhp3jw7llr73ya2cy
Modelling the spectral shape of continuous-wave lidar measurements in a turbulent wind tunnel
2022
Atmospheric Measurement Techniques
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a simple model based on the full width at half maximum (FWHM) of the laser beam intensity along the line of sight and assuming Taylor's frozen turbulence hypothesis. ...
Larger flow structures can be captured more accurately by the lidar, whereas small-scale turbulent flow structures are partly filtered out as a result of the lidar's probe volume averaging effect. ...
Lastly we would like to thank Mikael Sjöholm and Claus Brian Munk Pedersen from the Technical University of Denmark for their invaluable remote assistance with troubleshooting WindScanner hardware-and ...
doi:10.5194/amt-15-1355-2022
fatcat:siyuuxghuve2tmjbe5eqji7vky
Odor transport in turbulent flows: Constraints on animal navigation
1999
Limnology and Oceanography
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In addition, certain characteristics of individual odor filaments may vary consistently with distance from the odor source, thus providing directional information to a navigating organism. ...
Here, we present the results of a field study during which we measured the distributions of the time-averaged concentration, properties of odor filaments, conditional statistics, and relevant hydrodynamic ...
Acknowledgments We thank Dennis Allen and the rest of the Baruch Staff for providing facilities and logistic support for this project. J. E. Eckman, T. J. Hilbish, P. A. Jumars, S. A. ...
doi:10.4319/lo.1999.44.4.1056
fatcat:w7u7fwm6sbfmjpxheuarhmdsyu
Non-invasive estimation of relative pressure in turbulent flow using virtual work-energy
2019
Medical Image Analysis
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Recently, we proposed a novel method for non-turbulent flows, νWERP, utilizing the concept of virtual work-energy to accurately probe relative pressure through complex branching vasculature. ...
We present a theoretical method derivation based on flow covariance, quantifying the impact of flow fluctuations on relative pressure. νWERP-t is tested on a set of in-vitro stenotic flow phantoms with ...
Ground truth relative pressures given by the solid gray line, with corresponding estimates given by the dashed black line with black dots. ...
doi:10.1016/j.media.2019.101627
pmid:31865280
fatcat:chzu6ipr75b2hb6fc5cxe2tera
Lyapunov exponent as a metric for assessing the dynamic content and predictability of large-eddy simulations
2017
Physical Review Fluids
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This metric is applied to two turbulent flow configurations: forced homogeneous isotropic turbulence and a turbulent jet diffusion flame. ...
By comparing inert and reacting flows, it is shown that combustion increases the predictability of the turbulent simulation as a result of the dilatation and increased viscosity by heat release. ...
Computational resources supporting this work were provided by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the US ...
doi:10.1103/physrevfluids.2.094606
fatcat:exlg5bjdobhkbghkzimheqecda
An efficient surrogate model for emulation and physics extraction of large eddy simulations
[article]
2017
arXiv
pre-print
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In this paper, we propose a new surrogate model that provides efficient prediction and uncertainty quantification of turbulent flows in swirl injectors with varying geometries, devices commonly used in ...
In the quest for advanced propulsion and power-generation systems, high-fidelity simulations are too computationally expensive to survey the desired design space, and a new design methodology is needed ...
This splits the flow in such a way that the linearity assumption can be physically justified.
as the L-BFGS map for a single line-search when optimizing µ and τ with T fixed. ...
arXiv:1611.07911v2
fatcat:o5ncwrn7azd7peyzg5delugpo4
Controls on eDNA movement in streams: Transport, Retention, and Resuspension
2017
Scientific Reports
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In reality, streams are complex, reactive systems, with rapid, turbulent flows connected to slower flows in the subsurface and near-surface streambed 1 . ...
and estimating biodiversity. ...
Mecca, and A. Geissler for assistance with sample collection, and M. Renshaw, C. Gantz, K. Uy, for assistance processing eDNA samples. ...
doi:10.1038/s41598-017-05223-1
pmid:28698557
pmcid:PMC5506058
fatcat:w477nngrdfbhpca7jsnev7uf64
Turbulence-mediated facilitation of resource uptake in patchy stream macrophytes
2018
Limnology and Oceanography
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Black lines 657 are linear regression lines for the Groenlandia (solid line) and Callitriche (dotted line) data separately 658 and represent significant relationships (p 0.05). ...
Black lines 708 are linear regression lines for the Groenlandia (solid line) and Callitriche (dotted line) data separately 709 and represent significant relationships (p 0.05). ...
doi:10.1002/lno.11070
fatcat:hxhnd6lxzbff3bhm4yhyeniz5u
Perspectives on SCADA Data Analysis Methods for Multivariate Wind Turbine Power Curve Modeling
2021
Machines
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The rationale for a multivariate approach to wind turbine power curve is the potential decrease of the error metrics of the regression: this allows monitoring the performance of the target wind turbine ...
In this regard, a promising line of research regards multivariate approaches to the wind turbine power curve: these are based on incorporating additional environmental information or working parameters ...
Conflicts of Interest: The author declares no conflict of interest.
Abbreviations The following abbreviations are used in this manuscript: ...
doi:10.3390/machines9050100
fatcat:d2tyviqupbb75mxhc5jefjvn7y
The effects of cylindrical surface modifications on turbulent boundary layers
1986
AIAA Journal
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Two Starrett micrometers provided a maximum probe traverse of 50 mm, with a resolution of 0.01 mm, in both the streamwise and transverse flow directions. ...
In contrast, for a flat plate flow, fluid. inflows and streak interactions primarily result in lateral movement of the whole streak. ...
doi:10.2514/3.9395
fatcat:cnwc23jdbbb6jdqh75nftwvqdy
Calculating the Explicit Probability of Entrainment Based on Inertial Acceleration Measurements
2017
Journal of Hydraulic Engineering
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for entrainment of large grains in turbulent flows is less 180 than the frequency for characterising flow turbulence due to the lower sensitivity of particle 181 movement to micro-turbulence. ...
)) and turbulence (e.g. ...
doi:10.1061/(asce)hy.1943-7900.0001262
fatcat:f2eutc5xybb3rfzqduq7daqa2a
Measurement of 3D bubble distribution using digital inline holography
[article]
2019
arXiv
pre-print
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Overall, our paper introduces a low cost, compact and high-resolution bubble measurement technique that can be used for characterizing low void fraction bubbly flow in a broad range of applications. ...
In contrast, a large bubble/cluster is segmented using a modified watershed segmentation algorithm and its depth is measured through a wavelet-based focus metric. ...
Subsequently, the slope of the linear regression line derived from ( ) vs plot is used to estimate the bubble inclination angle α with respect to the s. ...
arXiv:1904.10894v1
fatcat:d3ro647w7vhjrdrveb3swmj6nq
Swimming performance of upstream migrant fishes in open-channel flow: a new approach to predicting passage through velocity barriers
2004
Canadian Journal of Fisheries and Aquatic Sciences
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David Hosmer and Mike Sutherland provided guidance on ...
The Froude number, F; which equals the ralio of lhcse two forces, identifies the state of flow: where g is gravitational acceleration and L is lhc depth of flow in a channel with a rectangular cross scction ...
Vol. 61, 2004 squares regression, with scalc (0) and shape (8) parameters that influence the valuc of w,. ...
doi:10.1139/f04-093
fatcat:icv6vr56nragrbbm6rslgrow2y
Probabilistic estimation of the Dynamic Wake Meandering model parameters using SpinnerLidar-derived wake characteristics
2021
Wind Energy Science
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We then apply Bayesian inference to obtain a probabilistic calibration of the DWM model, where the resulting joint distribution of parameters allows for both model implementation and uncertainty assessment ...
We derive two-dimensional wake flow characteristics including wake deficit, wake turbulence, and wake meandering from the lidar observations under different atmospheric stability conditions, inflow wind ...
Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc ...
doi:10.5194/wes-6-1117-2021
fatcat:e2yfciiepndotho6af2sn2ihp4
Forced and unforced unsteadiness in an axial turbomachine
2009
Experimental Thermal and Fluid Science
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It is shown that the turbulent kinetic energy reaches up to approximately a 50-60% of the total unsteady energy, while both forced and unforced components contribute equally to the rest of the energy. ...
It is demonstrated that the estimation of the unforced unsteadiness constitutes an accurate indicator of the presence of tip leakage flows for axial turbomachinery. ...
ACKNOWLEDGEMENTS This work was supported by the Research Project "Characterization of the Generation of Aerodynamic Noise due to the Interaction between the Rotor Blades and the Guide Vanes in Axial Flow ...
doi:10.1016/j.expthermflusci.2008.10.012
fatcat:xhxb3g3g6fdilkdpzajrjizziq
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