scholarly journals Dynamic behavior of the cavitation bubbles collapsing between a rigid wall and an elastic wall

AIP Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 065025
Author(s):  
Chao Zhang ◽  
Zhaoqin Yin ◽  
Chengxu Tu ◽  
Zeming Huang ◽  
Taohou Chen ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Rigid Wall ◽  
Cavitation Bubbles ◽  
Elastic Wall

Experimental and Analytical Investigation on Spaghetti Problem

2001 ◽  
Author(s):  
Yoshimasa Komaki ◽  
Nobuyuki Kobayashi ◽  
Masahiro Watanabe
Keyword(s):  
Dynamic Behavior ◽  
Multibody Dynamics ◽  
Constant Velocity ◽  
Analytical Investigation ◽  
Experimental Results ◽  
Flexible Beam ◽  
Gap Size ◽  
Lateral Vibration ◽  
Elastic Wall ◽  
Pulling Velocity

Abstract The dynamic behavior of the flexible beam, which is pulled into the slit of the elastic wall with a constant velocity, is discussed with multibody dynamics formulation and experiments. The vibration of the free tip of a flexible beam increases rapidly as pulling into the slit, and this behavior is called “Spaghetti Problem”. The effect of gap size of the slit on the behavior of Spaghetti Problem is especially focused. Dynamic behavior of the beam is simulated numerically and examined the accuracy of the presented formulation by changing the gap size and the pulling velocity of the beam as parameters. It is clarified that the presented modeling method simulates the experimental results quite well, and the gap size and the pulling velocity influence the increase of the lateral vibration near the inlet of the slit.

scholarly journals Dynamic behavior of a single bubble between the free surface and rigid wall

2020 ◽  
Vol 67 ◽  
pp. 105147 ◽  
Author(s):  
Guohao Huang ◽  
Mindi Zhang ◽  
Xiaojian Ma ◽  
Qing Chang ◽  
Chen Zheng ◽  
...  
Keyword(s):  
Free Surface ◽  
Dynamic Behavior ◽  
Rigid Wall ◽  
Single Bubble

scholarly journals Hydroelasticity effects on water-structure impacts

2020 ◽  
Vol 61 (9) ◽  
Author(s):  
T. Mai ◽  
C. Mai ◽  
A. Raby ◽  
D. M. Greaves
Keyword(s):  
Vertical Wall ◽  
Water Structure ◽  
Rigid Wall ◽  
Total Force ◽  
Impact Loads ◽  
Wave Impact ◽  
Impact Forces ◽  
Elastic Wall ◽  
Vertical Walls ◽  
The Impact

Abstract Local and global loadings, which may cause the local damage and/or global failure and collapse of offshore structures and ships, are experimentally investigated in this study. The research question is how the elasticity of the structural section affects loading during severe environmental conditions. Two different experiments were undertaken in this study to try to answer this question: (i) vertical slamming impacts of a square flat plate, which represents a plate section of the bottom or bow of a ship structure, onto water surface with zero degree deadrise angle; (ii) wave impacts on a truncated vertical wall in water, where the wall represents a plate section of a hull. The plate and wall are constructed such that they can be either rigid or elastic by virtue of a specially designed spring system. The experiments were carried out in the University of Plymouth’s COAST Laboratory. For the cases considered here, elasticity of the impact plate and/or wall has an effect on the slamming and wave impact loads. Here the slamming impact loads (both pressure and force) were considerably reduced for the elastic plate compared to the rigid one, though only at high impact velocities. The total impact force on the elastic wall was found to reduce for the high aeration, flip-through and slightly breaking wave impacts. However, the impact pressure decreased on the elastic wall only under flip-through wave impact. Due to the elasticity of the plates, the impulse of the first positive phase of pressure and force decreases significantly for the vertical slamming impact tests. This significant effect of hydroelasticity is also found for the total force impulse on the vertical wall under wave impacts. Graphic abstract Hydroelasticity effects on water-structure impacts: a impact pressures on dropped plates; b impact forces on dropped plates; c, d, e, f wave impact pressures on the vertical walls; g wave impact forces on the vertical walls; h wave force impulses on the vertical walls: elastic wall 1 vs. rigid wall (filled markers); elastic wall 2 vs. rigid wall (empty markers)

Dynamics of cavitation bubbles in acoustic field near the rigid wall

2015 ◽  
Vol 109 ◽  
pp. 507-516 ◽  
Author(s):  
Xi Ye ◽  
Xiongliang Yao ◽  
Rui Han
Keyword(s):  
Acoustic Field ◽  
Rigid Wall ◽  
Cavitation Bubbles

Dynamic Behavior of Bubble near Vertical Plate in Underwater Explosion

2011 ◽  
Vol 52-54 ◽  
pp. 1080-1085
Author(s):  
Jian Li ◽  
Ji Li Rong ◽  
Da Lin Xiang
Keyword(s):  
Dynamic Behavior ◽  
Vertical Plate ◽  
Underwater Explosion ◽  
Rigid Wall ◽  
Engineering Calculation ◽  
Initial Condition ◽  
Bubble Motion ◽  
Fluid Field ◽  
Acceleration Model ◽  
Theory Research

In this study, the volume-acceleration model was introduced to determine the initial condition for bubble motion during underwater explosion. Subroutines, which defined the initial and boundary conditions of the fluid field, were developed based on MSC.DYTTAN software. Numerical simulations were compared with the results of validated experimental data. From the basic phenomenon of interaction between a bubble and a vertical rigid wall, the dynamic behavior of a bubble near a vertical rigid wall was simulated and analyzed. The dynamic behavior of bubble and the jet were studied systematically and summarized relative to the law that both of the motion of bubble and water jet are closely related with the standoff distance parameter. The results of this study have valuable implications for correlative theory research and engineering calculation.

Hydroelasticity and nonlinearity in the interaction between water waves and an elastic wall

2018 ◽  
Vol 845 ◽  
pp. 293-320 ◽  
Author(s):  
Gal Akrish ◽  
Oded Rabinovitch ◽  
Yehuda Agnon
Keyword(s):  
Incident Wave ◽  
Water Waves ◽  
Fundamental Problem ◽  
Wave Force ◽  
Rigid Wall ◽  
High Order ◽  
Dynamical Response ◽  
Computational Domain ◽  
Wave Group ◽  
Elastic Wall

The present study investigates the role of hydroelasticity and nonlinearity in the fundamental problem of the interaction between non-breaking water waves and an elastic wall. To this end, two interaction scenarios are considered: the interaction of a rigid wall supported by springs and a pulse-type wave, and the interaction of an elastic deformable wall and an incident wave group. Both of these scenarios are numerically simulated in a computational domain representing a two-dimensional wave flume. The simplicity of the domain enables one to perform highly efficient simulations using the high-order spectral method (HOSM). Wave generation at the flume entrance and the wave–wall interaction at the flume end are simulated by means of the additional potential concept. In this way, the efficiency that characterizes the original HOSM is preserved for the present non-periodic problems. The investigation of the first scenario reveals the influence of the wall’s dynamical response on the hydrodynamic values. The results show that the maximum wave run-up and wave force are prominently fluctuating around the values corresponding to a fixed wall as a function of the wall’s eigenfrequency, revealing regions of relaxation and amplification. The second scenario studies the effect of the nonlinear evolution of the incident wave group. The high-order wave harmonics generated during the group evolution are found to be significant for predicting extreme hydrodynamic and structural values, and may result in resonant interactions in which hydroelasticity appears to play an important role.

THE INFLUENCE OF WALL COMPLIANCE ON FLOW PATTERN IN A CURVED ARTERY EXPOSED TO A DYNAMIC PHYSIOLOGICAL ENVIRONMENT: AN ELASTIC WALL MODEL VERSUS A RIGID WALL MODEL

2012 ◽  
Vol 12 (04) ◽  
pp. 1250079 ◽  
Author(s):  
XIAOHONG WANG ◽  
XIAOYANG LI
Keyword(s):  
Boundary Condition ◽  
Flow Pattern ◽  
Vascular Diseases ◽  
Slip Boundary Condition ◽  
Rigid Wall ◽  
Wall Model ◽  
Remarkable Effect ◽  
Curved Artery ◽  
Elastic Wall ◽  
Wall Compliance

Plenty of well-established medical research works have shown that many vascular diseases such as stenosis and atherosclerosis are prone to appear in curved arteries. In this paper, we investigated the influence of wall compliance on flow pattern in curved arteries exposed to dynamic physiological environments in order to understand the hemodynamic mechanism and provide a basis for clinical research in related areas. Representative curved arteries with elastic and rigid walls are constructed by computers. The fluid-structure interaction (FSI) effect is considered in our calculations. Physiological velocity profile is assigned as the inlet boundary condition. No-slip boundary condition is applied at the blood-wall interface. Our results show that the maximum axial velocity in the rigid wall model is larger than that in the elastic wall model. Wall compliance also has a remarkable effect on backflow patterns. Significant differences in pressure distribution are found between the elastic and rigid wall models. Blood strain rate distribution patterns in the two models were also compared. It was interesting to discover that in the straight part of the artery, the flexible wall made the counter-rotating vortices induced by the curvature gradually disappear along a downstream direction. However, for the flow feature in the rigid wall model, strong vortices existed throughout the entire straight part of the artery. It revealed that the increment of wall rigidity results in a reduction in wall movement capacity, thus affecting the physiological function of the arterial wall, making it incapable of effectively regulating the flow pattern inside the artery. The current work indicates that the influence of wall compliance on flow pattern in curved artery is significant.

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