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84 results for “airflow”
Figure 2 in Atmospheric Disturbances in the Airflow around Mountains and the Problem of Flight Safety in the Mountains of the Republic of Adygeya
Figure 2. Pattern of the Mount Fisht airflow for the model (a) – scenario I (U=15 m/s), (b) – scenario II (U=19 m/s) and (c) – scenario III (U=22 m/s).
Figure 1 in Atmospheric Disturbances in the Airflow around Mountains and the Problem of Flight Safety in the Mountains of the Republic of Adygeya
Figure 1. Lago-Naki Plateau. The dashed line shows the cross-section of the terrain through Mount Fisht for model calculations.
Airflow modelling predicts seabird breeding habitat across islands
<p>Wind is fundamentally related to shelter and flight performance: two factors that are critical for birds at their nest sites. Despite this, airflows have never been fully integrated into models of breeding habitat selection, even for well-studied seabirds. Here we use computational fluid dynamics to provide the first assessment of whether flow characteristics (including wind speed and turbulence) predict the distribution of seabird colonies, taking common guillemots (<em>Uria aalge</em>) breeding on Skomer island as our study system. This demonstrates that occupancy is driven by the need to shelter from both wind and rain/ wave action, rather than airflow characteristics alone. Models of airflows and cliff orientation both performed well in predicting high quality habitat in our study site, identifying 80% of colonies and 93% of avoided sites, as well as 73% of the largest colonies on a neighbouring island. This suggests generality in the mechanisms driving breeding distributions, and provides an approach for identifying habitat for seabird reintroductions considering current and projected wind speeds and directions.</p>
Airflow dynamics and aeolian sand transport across a beach-climbing dune-clifftop dune system
<p>This study presents an analysis of wind flow and sediment transport from the beach, up a 50m high, long (130m), steep (mean slope 26°) climbing dune and across a 1.5 m high max, 85 m long and 17.5 m wide clifftop dune 30km south of Dakhla in Morocco, NW Africa during highly oblique incident wind conditions. Multiple 2D sonic and cup/vane anemometers and sand traps were utilised for measurements. Flow steering was significant on the upper climbing dune. Flow deceleration occurred near the dune toe, and topographic forcing of flow was considerable on the upper slopes of the climbing dune. Near-surface flow steadiness (CV<sub>U1</sub>, CV<sub>U0.25</sub>) on the climbing dune straight slope segment was low and constant The distance upslope over which the airflow reached the speed comparable to that on the beach increases as the incident wind speed increases. The greatest flow acceleration and speed-up was observed at the cliff edge reaching 250% at 1m height and 220% at 0.25m height for the lowest incident wind speed class (4-5 m/s). The sand transport rate declined from the beach to the climbing dune toe and lower slope, but at the uppermost section of the climbing dune was 4 times higher than at the beach for the 7-8m/s incident wind speed. Sand in aeolian transport was generally finer than surface sand with mean grain size increasing up the slope. A comparison of the sand transport data collected with sand transport models, and the effects of slope on aeolian transport are also examined.</p>
Airflow modelling predicts seabird breeding habitat across islands
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Encoding and control of airflow orientation by a set of Drosophila fan-shaped body neurons
<p class="Body"><span><span><span><span><span><span><span><span><span><span>The insect Central Complex (CX) is thought to underlie goal-oriented navigation but its organization is still not fully understood. We recorded from genetically-identified CX cell types in <i>Drosophila</i> and presented directional visual, olfactory, and airflow cues known to elicit orienting behavior. We found that a group of neurons targeting the ventral fan-shaped body (ventral P-FNs) are robustly tuned for airflow direction. Ventral P-FNs did not generate a "map" of airflow direction. Instead, cells in each hemisphere were tuned to 45° ipsilateral, forming a pair of orthogonal bases. Imaging experiments suggest that ventral P-FNs inherit their airflow tuning from neurons that provide input from the lateral accessory lobe (LAL) to the noduli (NO). Silencing ventral P-FNs prevented flies from selecting appropriate corrective turns following changes in airflow direction. Our results identify a group of central complex neurons that robustly encode airflow direction and are required for proper orientation to this stimulus.</span></span></span></span></span></span></span></span></span></span></p>
Miniature multihole airflow sensor for lightweight aircraft over wide speed and angular range
<p>This repository contains:</p> <ul> <li>the data collected for the paper "Miniature multihole airflow sensor for lightweight aircraft over wide speed and angular range"</li> <li>the python code to extract the wind tunnel and flight data to reproduce the plots in the paper</li> <li>the exact polynomials used for the calibration</li> <li>the 3D object files of the airflow sensor</li> <li>the schematics of the PCB</li> <li>the video of the flown manoeuvres (available on youtube: https://youtu.be/U3nR1v3fbZg)</li> </ul> <p>The data and the plots are included in the repository, but can be reproduced by running the python scripts in the following order:</p> <ol> <li>Code/reduce_data.py</li> <li>Code/plot_averages.py</li> <li>Code/read_tunnel.py</li> <li>Code/Regress.py</li> <li>Code/Validation_plot.py</li> </ol>
Dataset supplementing " X. Zhang, B. Ojha, H. Bichlmaier, I. Hartmann and H. Kohler; Extensive Gaseous Emissions Reduction of Firewood-Fueled Low Power Fireplaces by a Gas Sensor-Based Advanced Combustion Airflow Control System and Catalytic Post-Oxidation, Sensors, 2023"
<p>Dataset supplementing " X. Zhang, B. Ojha, H. Bichlmaier, I. Hartmann and H. Kohler; Extensive Gaseous Emissions Reduction of Firewood-Fueled Low Power Fireplaces by a Gas Sensor-Based Advanced Combustion Airflow Control System and Catalytic Post-Oxidation, Sensors, 2023"</p>
Airflow dynamics and aeolian sand transport across a beach-climbing dune-clifftop dune system
<p>This study presents an analysis of wind flow and sediment transport from the beach, up a 50m high, long (130m), steep (mean slope 26°) climbing dune and across a 1.5 m high max, 85 m long and 17.5 m wide clifftop dune 30km south of Dakhla in Morocco, NW Africa during highly oblique incident wind conditions. Multiple 2D sonic and cup/vane anemometers and sand traps were utilised for measurements. Flow steering was significant on the upper climbing dune. Flow deceleration occurred near the dune toe, and topographic forcing of flow was considerable on the upper slopes of the climbing dune. Near-surface flow steadiness (CV<sub>U1</sub>, CV<sub>U0.25</sub>) on the climbing dune straight slope segment was low and constant The distance upslope over which the airflow reached the speed comparable to that on the beach increases as the incident wind speed increases. The greatest flow acceleration and speed-up was observed at the cliff edge reaching 250% at 1m height and 220% at 0.25m height for the lowest incident wind speed class (4-5 m/s). The sand transport rate declined from the beach to the climbing dune toe and lower slope, but at the uppermost section of the climbing dune was 4 times higher than at the beach for the 7-8m/s incident wind speed. Sand in aeolian transport was generally finer than surface sand with mean grain size increasing up the slope. A comparison of the sand transport data collected with sand transport models, and the effects of slope on aeolian transport are also examined.</p>
Investigation of Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Clinical Efficacy of Oral Danirixin in Symptomatic COPD Subjects With Mild to Moderate Airflow Limitation at Risk for Exa
ClinicalTrials.gov study NCT02130193. IPD Sharing: Not stated. Countries: 2. Publications: 1.
AIM to Improve Asthma: Airflow Improvements During Meal-Prep
ClinicalTrials.gov study NCT04464720. IPD Sharing: NO. Countries: 1. Publications: 1.
Encoding and control of airflow orientation by a set of Drosophila fan-shaped body neurons
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Data from: Airflow analysis of Pyeongtaek St. Mary's Hospital during hospitalization of the First Middle East respiratory syndrome patient in Korea
Middle East Respiratory Syndrome (MERS) is known to be transmitted through close contact. However, epidemiological surveys of MERS in Korea indicated that some secondary patients were infected without close contact. Therefore, the possibility of other transmission routes must be identified. In this study, the possibility of MERS spreading through airflow was investigated on the 8th floor of Pyeongtaek St. Mary's Hospital. Computational fluid dynamics was used to analyze the indoor airflow and passive tracer diffusion during the index patient's stay. Six cases were simulated for different outdoor wind directions and indoor mechanical ventilation operations. When a passive tracer was released in ward 8104, where the index patient was hospitalized, the passive tracer spread through the indoor airflow, which was created by the outdoor airflow. Ward 8109, which had the largest number of infected cases and was far distant from ward 8104, showed passive tracer concentration in all cases. This result indicates that MERS may have spread through airflow. The study results do not imply that the infection pathway of MERS is airborne. However, the results show the possibility of MERS spreading through airflow in specific environments such as poor ventilation environments.
Systematic characterization of wing mechanosensors that monitor airflow and wing deformations
<p>Animal wings deform during flight in ways that can enhance lift, facilitate flight control, and mitigate damage. Monitoring the structural and aerodynamic state of the wing is challenging because deformations are passive, and the flow fields are unsteady; it requires distributed mechanosensors that respond to local airflow and strain on the wing. Without a complete map of the sensor arrays, it is impossible to model control strategies underpinned by them. Here, we present the first systematic characterization of mechanosensors on the dragonfly's wings: morphology, distribution, and wiring. By combining a cross-species survey of sensor distribution with quantitative neuroanatomy and a high-fidelity finite element analysis, we show that the mechanosensors are well-placed to perceive features of the wing dynamics relevant to flight. This work describes the wing sensory apparatus in its entirety and advances our understanding of the sensorimotor loop that facilitates exquisite flight control in animals with highly deformable wings.</p> <p> </p>
Improvements in airflow characteristics and effect on the NOSE score after septoturbinoplasty: A computational fluid dynamics analysis
<p><span>Septoturbinoplasty is a surgical procedure that can improve nasal congestion symptoms in patients with nasal septal deviation and inferior turbinate hypertrophy. However, it is unclear which physical domains of nasal airflow after septoturbinoplasty are related to symptomatic improvement. This work employs computational fluid dynamics modeling to identify the physical variables and domains associated with symptomatic improvement. Sixteen numerical models were generated using eight patients' pre- and postoperative computed tomography scans. Changes in unilateral nasal resistance, surface heat flux, relative humidity, and air temperature and their correlations with improvement in the </span><span>Nasal Obstruction Symptom Evaluation (NOSE) score were analyzed. The NOSE score significantly improved after septoturbinoplasty, from 14.4 ± 3.6 to 4.0 ± 4.2 (p < 0.001). The surgery not only increased the airflow partition </span><span>on the more obstructed side (MOS) from 31.6 ± 9.6 to 41.9 ± 4.7% (p = 0.043), but also reduced the unilateral nasal resistance in the MOS from 0.200 ± 0.095 to 0.066 ± 0.055 Pa/(mL</span><span>×</span><span>s) (p = 0.004). Improvement in the NOSE score correlated significantly with the reduction in unilateral nasal resistance in the preoperative MOS (<em>r</em>=0.81). Also, improvement in the NOSE score correlated better with the increase in surface heat flux in the preoperative MOS region from the nasal valve to the choanae (<em>r</em>=0.87) than in the vestibule area (<em>r</em>=0.63). Therefore, </span><span>unilateral nasal resistance and mucous cooling in the preoperative MOS can explain the perceived improvement in symptoms after septoturbinoplasty. Moreover, the physical domain between the nasal valve and the choanae might be more relevant to patient-reported patency than the vestibule area. </span></p>
Large eddy simulation input data for publication "Pressure fields in the airflow over wind-generated surface waves" by Funke et al.
<p>Input files allow for the simulation of a turbulent flow over a sinusoidal surface using the PALM LES model, version 6.0, revision 4901.</p>
The Influence of Posture on Airway Diameter, Resistance and Airflow Distribution in Healthy Subjects
ClinicalTrials.gov study NCT01893697. IPD Sharing: Not stated. Countries: 1. Publications: 1.
The Effect of Mouth Closure on Airflow in OSA
ClinicalTrials.gov study NCT06547658. IPD Sharing: NO. Countries: 1. Publications: 1.
A Study to Evaluate Changes in Nasal Airflow of Loratadine/Pseudoephedrine Tablet and Fluticasone Propionate Nasal Spray in Subjects Following Allergen Exposure
ClinicalTrials.gov study NCT03443843. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Changes in Nasal Airflow Parameters After Septoplasty and Turbinoplasty
ClinicalTrials.gov study NCT04220853. IPD Sharing: NO. Countries: 1. Publications: 4.
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