Average velocity field of the air flow over the water surface in a laboratory modeling of storm and hurricane conditions in the ocean

Kandaurov, Alexander; Troitskaya, Yuliya; Sergeev, D. A.; Vdovin, Maxim; Baidakov, G. A.

doi:10.1134/s000143381404015x

Cited by 18 publications

(22 citation statements)

References 10 publications

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“…An example of images of the disturbance for different time of evolution is shown in Figure 2a. The visible contour of the disturbance was automatically determined with help of algorithms for image processing taken from the [11], where the form of surface waves with small scale breakings on the crest was determined using Canny method. In Figure 2b and c…”

Section: System For Visualization and Image Processingmentioning

confidence: 99%

Investigation of Artificially Induced Bag-Breakup Fragmentation of Water Surface with Optical Methods

Kandaurov¹,

Sergeev²,

Troitskaya³

2021

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A paper is devoted to the investigation of the processes of artificially induced bagbreakup type of spray formation phenomenon within wind-wave interaction. The optical methods are considered. Experiments were carried out on the Thermostratified Wind-Wave Tank (TSWiWaT) of the IAP RAS. High-speed video filming with the shadow imaging method demonstrates the possibility of artificial reproduction of all the main stages of this phenomenon, which are also observed for the sporadically occurred ones: inflation of a thin membrane surrounded by a thicker rim, rupture of the membrane leading to the formation of small droplets, fragmentation of the rim with the formation of large droplets. The processing of the images allowed us to estimate typical lifetimes and sizes of membrane for artificial bagbreakup events which turned out to be close to the same parameters for sporadically occurring ones.

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Section: System For Visualization and Image Processingmentioning

confidence: 99%

Investigation of Artificially Induced Bag-Breakup Fragmentation of Water Surface with Optical Methods

Kandaurov¹,

Sergeev²,

Troitskaya³

2021

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“…This was possible due to the fact that most droplets in particular area of image have similar velocities. PIV processing of the images was performed by specially developed software similar to our previous studies of air velocities in marine boundary layer [12]. Successive frames were compared, interrogation window size 128×128 pixels with 50% overlapping, only one iteration is used, with tree-point interpolation for CCF maximum.…”

Section: Droplet Velocity Estimatesmentioning

confidence: 99%

Investigation of stimulated bag-breakup processes in laboratory modeling of wind-wave interaction

Kandaurov¹,

Sergeev²,

Troitskaya³

2019

ACC Journal

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The laboratory experiments for identification of mechanisms of the spume droplet's formation in marine atmospheric boundary layer, when strong wind tears off water from the crest of the waves, were carried out at the High-speed wind-wave flume of IAP RAS. The main mechanism responsible for the generation of spume droplets is bag breakup fragmentation of small-scale disturbances that arise at the air-water interface under the strong wind. This work concentrates on investigation of a separate bag-breakup event that was forced to occur in a dried high-speed wind-wave flume. The details of the bag-breakup fragmentation were investigated qualitatively and quantitatively using synchronized multiperspective high-speed video recording in shadowgraph configuration.

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“…This allowed to remove the overexposure from the area where the sheet hit the surface which is especially important for capturing image close to the ledge of the obstacle where an intense glare from the wing surface appeared (see Fig 3 b, 5). Two-step adaptive displacement search algorithm was used for cross-correlation analysis when the initial interrogation window 64 × 64 pixel decreased to 32 × 32 pixels (similar to the study [27]). Overlapping of windows was 50%.…”

Section: Measurements Of the Flow By Visualisation: Overall View (Quamentioning

confidence: 99%

Validation of numerical methods for flow patterns modeling based on comparison with the results of laboratory experiments using visualization methods

et al. 2019

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A series of laboratory and numerical experiments were carried out to study the structure of the turbulent flow over a rectangular obstacle for high Reynolds number. The results of numerical simulation performed within ANSYS CFX were verified on data obtained in the wind tunnel of IAP RAS by visualization methods including Particle Image Velocimetry. It was found that the airflow over the obstacle can be conditionally divided into main several regions: the region of the initiation of the detachment and formation shielding zone, the region of the maximum vertical separation and vortex development and the region of flow reattachment. Comparison of numerical calculations with the results of experiments showed that the physical processes of the airflow around model objects can be optimally modeled in a three-dimensional setting using the Detached Eddy turbulence model (DES) with central numerical differentiation scheme and allowed to select optimal parameters of calculation grid.

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Average velocity field of the air flow over the water surface in a laboratory modeling of storm and hurricane conditions in the ocean

Cited by 18 publications

References 10 publications

Investigation of Artificially Induced Bag-Breakup Fragmentation of Water Surface with Optical Methods

Investigation of Artificially Induced Bag-Breakup Fragmentation of Water Surface with Optical Methods

Investigation of stimulated bag-breakup processes in laboratory modeling of wind-wave interaction

Validation of numerical methods for flow patterns modeling based on comparison with the results of laboratory experiments using visualization methods

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