Discovering a meaningful symbolic expression that explains experimental data is fundamental challenge in many scientific fields. We present novel, open-source computational framework called Scientist-Machine Equation Detector (SciMED), which integrates discipline wisdom scientist-in-the-loop approach, with state-of-the-art regression (SR) methods. SciMED combines wrapper selection method, based on genetic algorithm, automatic machine learning and two levels of SR test five configurations...

A time-resolved particle image velocimetry (PIV) system has been developed at the University of Western Ontario, London, ON, Canada, with long-recording-time capabilities. This is uniquely suited to study unsteady aerodynamics and hydrodynamics, such as avian or bluff-body oscillations. Measurements have made on an elongated bluff body through initial build-up phase flutter. The possibilities this instability, which was responsible for collapse Tacoma Narrows Bridge, are significantly...

We report an analysis of small-scale enstrophy ω 2 and rate strain s dynamics in the proximity turbulent/non-turbulent interface a flow without strong mean shear. The techniques used are three-dimensional particle tracking (3D-PTV), allowing field velocity derivatives to be measured followed Lagrangian manner, direct numerical simulations (DNS). In both experiment simulation Taylor-microscale Reynolds number is Re λ = 50. results based on viewpoint with main focus tracers crossing interface....

The work reported below is the first of its kind to study properties turbulent flow without strong mean shear in a Newtonian fluid proximity turbulent/nonturbulent interface, with emphasis on small-scale aspects. main tools used are three-dimensional particle tracking system allowing one measure and follow Lagrangian manner field velocity derivatives direct numerical simulations. comparison (A), intermediate (B), nonturbulent (C) regions interface allows for observation key physical...

Particle image velocimetry is applied to the lid-driven flow in a cube validate numerical prediction of steady-oscillatory transition at lower than ever observed Reynolds number. Experimental results agree with simulation demonstrating large amplitude oscillatory motion overlaying base quasi-two-dimensional mid-plane. A good agreement values critical number and frequency appearing oscillations as well similar spatial distributions are obtained.

We present an open-source MATLAB package, entitled OpenPIV-MATLAB, for analyzing particle image velocimetry (PIV) data. extend the PIV analysis with additional tools post-processing results including estimation of aero/hydrodynamic forces from data a wake behind immersed (bluff or streamlined) body. The paper presents detailed description packages, covering three main parts: generating two-dimensional two component velocity fields pairs images (OpenPIV-MATLAB), spatial and temporal flow...

The evolution of material lines, $l$, and vorticity, $\omega$, is investigated experimentally through three-dimensional particle-tracking velocimetry (3D-PTV) in quasi-homogeneous isotropic turbulence at $Re_{\lambda }\,{=}\,50$. Through 3D-PTV data the full set velocity derivatives, $\partial u_{i}/\partial x_{j}$, accessible. This allows us to monitor various turbulent quantities along fluid particle trajectories. main emphasis present work on physical mechanisms that govern Lagrangian $l$...

Aggregates prepared under fully destabilized conditions by the action of Brownian motion were exposed to an extensional flow generated at entrance a sudden contraction. Two noninvasive techniques used monitor their breakup process [i.e. light scattering and three-dimensional (3D) particle tracking velocimetry (3D-PTV)]. While first one can be measure size morphology formed fragments after breakage event, latter is capable resolving trajectories individual aggregates up point as well...

Aggregates grown in mild shear flow are released, one at a time, into homogeneous isotropic turbulence, where their motion and intermittent breakup is recorded by three-dimensional particle tracking velocimetry (3D-PTV). The aggregates have an open structure with fractal dimension of ∼2.2, size 1.4 ± 0.4 mm, which large, compared to the Kolmogorov length scale (η = 0.15 mm). 3D-PTV tracers allows for simultaneous measurement aggregate trajectories full velocity gradient tensor along...

Direct estimation of Lagrangian turbulence statistics is essential for the proper modeling dispersion and transport in highly obstructed canopy flows. However, flow measurements demand very high rates data acquisition, resulting bottlenecks that prevented flows hitherto. We report on a new extension to 3D Particle Tracking Velocimetry (3D-PTV) method, featuring real-time particle segmentation outputs centroids sizes tracer particles performed dedicated hardware during high-speed digital...

In a chemosensing system, the local olfactory environment experienced by foraging organism is defined as an odorscape. Using nocturnal pink bollworm moth (Pectinophora gossypiella), we tested combined effect of three biophysical aspects in its immediate odorscape to shed light on coupling effects biotic and abiotic factors navigation performances forager: i) quality pheromone source, ii) availability, iii) airflow characteristics. The performance males was investigated using wind tunnel...

Abstract Camera calibration is a key component of three-dimensional particle tracking velocimetry (PTV) experiments, and its proper implementation to the success method. In this paper, we review compare four different camera models used in PTV experiments without volumetric refinement. One new provides an analytical inversion Soloff polynomial. The other three are taken from established open source frameworks: OpenPTV, MyPTV proPTV. particular, present general formulation that allows their...

Larval fishes experience extreme mortality rates, with 99% of a cohort perishing within days after starting to actively feed. While recent evidence suggests that hydrodynamic factors contribute constraining larval feeding during early ontogeny, is complex process involves numerous interacting behavioural and biomechanical components. How these components change throughout ontogeny how they remain unclear. Using 339 observations attempts, we quantified the effects morphological traits on...

Abstract Multi-scale macroalgae growth models are required for the efficient design of sustainable, economically viable, and environmentally safe farms. Here, we develop a multi-scale model Ulva sp. nitrogen sequestration in an intensive cultivation farm, regulated by temperature, light, nutrients. The incorporates range scales incorporating spatial effects two steps: light extinction at reactor scale (1 m) nutrient absorption farm km). was validated on real data from experimental installed...