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Numerical investigation into water entry problems of a flat plate with air pockets

Journal of Ocean Engineering and Science 2023年第4期8卷 386-400页

作者： Casey O’Connor Saeed Mohajernasab Nagi Abdussamie National Centre for Maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonTasmaniaAustralia

Computational Fluid Dynamics(CFD)investigations into water entry problems of a rigid flat plate with air pockets were systematically *** Volume of Fluid(VOF)model was utilised to capture localised slamming phenomena that occur during,and post-impact *** model’s geometry was modified to include a pocket on the slamming impact surface to investigate the effect of air entrapment on the magnitude and distribution of slamming forces and pressures.A parametric study was conducted on the geometric parameters of the modelled pocket by altering its area,depth,and volume to exam-ine the response of slamming force and pressure loading under several impact *** numerical results of slamming forces and pressures were in good agreement with experimental drop test measure-ments(with relative error of-6%and 7%for the magnitude of slamming force and pressure,respectively).The numerical results proved that the peak pressure is proportional to the magnitude of impact velocity squared(p maxαv^(2)).

关键词： Marine structures Slamming air entrapment Computationalﬂuid dynamics Drop tests

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Numerical Modeling of Shallow Water Table Behavior with Lisse Effect

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Chinese Geographical Science 2011年第2期21卷 249-256页

作者： ZHANG Jinga GONG Huili Mark A ROSS LI Xiaojuan ZHOU Demin Key Laboratory of Resource Environment and GIS of Beijing Capital Normal University Beijing 100048 China Department of Civil and Environmental Engineering University of South Florida 4202 E. FowlerAve ENB 118 Tampa FL 33620 USA

air entrapment is an important consideration in environments with shallow water tables and sandy soil, like the condition of highly conductive sandy soils and flat topography in Florida, USA. It causes water table rises in soils, which are significantly faster and higher than those in soils without air entrapment. Two numerical models, Integrated Hydrologic Model (IHM) and HYDRUS-1D (a single-phase, one-dimensional Richards′ equation model) were tested at an area of west central Florida to help further understanding the shallow water table behavior during a long term air entrapment. This investigation employed field data with two modeling approaches to quantify the variation of air pressurization values. It was found that the air pressurization effect was responsible at time up to 40 cm of water table rise being recorded by the observation well for these two models. The values of air pressurization calculated from IHM and HYDRUS-1D match the previously published values. Results also indicated that the two numerical models did not consider air entrapment effect (as the predictive parameters remain uncertain) and thus results of depth to water table from these models did not compare to the observations for these selected periods. Incorporating air entrapment in prediction models is critical to reproduce shallow water table observations.

关键词： shallow water table Lisse effect air entrapment Integrated Hydrologic Model (IHM) HYDRUS-1D Florida

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Vorticity effects in drop impact

Vorticity effects in drop impact

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第九届全国流体力学学术会议

作者： Marie-Jean THORAVAL Sigurdur T.THORODDSEN International Center for Applied Mechanics State Key Laboratory for Strength and Vibration of Mechanical StructuresXi'an Jiaotong University Division of Physical Sciences and Engineering & Clean Combustion Research Center King Abdullah University of Science and Technology(KAUST)

The impact of drop on a liquid pool can entrap bubbles and splash smaller *** bubbles can dissolve and transfer gas into the pool,while the droplets can generate *** studies on drop impacts have neglected the effect of vorticity on the *** were able to reproduce the large scale dynamics of the drop entering the ***,recent results have demonstrated that the vorticity produced at the air-liquid interface plays a critical role in explaining the complex dynamics of splashing and air *** focus here on the dynamics of the air bubble entrapped just after contact between the drop and the *** show the role of vorticity in producing a large range of different bubble shape,including toroidal bubbles,and bubbles containing a liquid droplet

关键词： Drop impact air entrapment Splashing Vorticity Vortex Ring

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