Numerical study of acoustically driven bubble cloud dynamics near a rigid wall

2018 ◽  
Vol 40 ◽  
pp. 944-954 ◽  
Author(s):  
Jingsen Ma ◽  
Chao-Tsung Hsiao ◽  
Georges L. Chahine
Keyword(s):  
Numerical Study ◽  
Rigid Wall ◽  
Bubble Cloud ◽  
Cloud Dynamics

scholarly journals Cavitation Bubble Cloud Break-Off Mechanisms at Micro-Channels

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 215
Author(s):  
Paul McGinn ◽  
Daniel Pearce ◽  
Yannis Hardalupas ◽  
Alex Taylor ◽  
Konstantina Vogiatzaki
Keyword(s):  
Cavitation Bubble ◽  
Cavitation Inception ◽  
Wave Dynamics ◽  
Bubble Cloud ◽  
Cloud Dynamics ◽  
Micro Channels ◽  
Physical Insight ◽  
Cloud Process ◽  
Good Agreement

This paper provides new physical insight into the coupling between flow dynamics and cavitation bubble cloud behaviour at conditions relevant to both cavitation inception and the more complex phenomenon of flow “choking” using a multiphase compressible framework. Understanding the cavitation bubble cloud process and the parameters that determine its break-off frequency is important for control of phenomena such as structure vibration and erosion. Initially, the role of the pressure waves in the flow development is investigated. We highlight the differences between “physical” and “artificial” numerical waves by comparing cases with different boundary and differencing schemes. We analyse in detail the prediction of the coupling of flow and cavitation dynamics in a micro-channel 20 m high containing Diesel at pressure differences 7 MPa and 8.5 MPa, corresponding to cavitation inception and "choking" conditions respectively. The results have a very good agreement with experimental data and demonstrate that pressure wave dynamics, rather than the “re-entrant jet dynamics” suggested by previous studies, determine the characteristics of the bubble cloud dynamics under “choking” conditions.

Shock‐controlled bubble cloud dynamics and light emission.

2011 ◽  
Vol 129 (4) ◽  
pp. 2619-2619 ◽  
Author(s):  
R. Glynn Holt ◽  
Phillip A. Anderson ◽  
Ashwinkumar Sampathkumar ◽  
Jonathan R. Sukovich ◽  
D. Felipe Gaitan
Keyword(s):  
Light Emission ◽  
Bubble Cloud ◽  
Cloud Dynamics

Numerical study on nonlinear behavior of a collapsing bubble cloud in an ultrasound field

2006 ◽  
Vol 119 (5) ◽  
pp. 3408-3408
Author(s):  
Shin Yoshizawa ◽  
Teiichiro Ikeda ◽  
Shu Takagi ◽  
Yoichiro Matsumoto
Keyword(s):  
Numerical Study ◽  
Nonlinear Behavior ◽  
Bubble Cloud ◽  
Ultrasound Field

Numerical Study of Stability and Accuracy of the Immersed Boundary Method Coupled to the Lattice Boltzmann BGK Model

2014 ◽  
Vol 16 (1) ◽  
pp. 136-168 ◽  
Author(s):  
Yongguang Cheng ◽  
Luoding Zhu ◽  
Chunze Zhang
Keyword(s):  
Lattice Boltzmann ◽  
Numerical Study ◽  
Rigid Wall ◽  
Segment Length ◽  
Immersed Boundary ◽  
Coupling Scheme ◽  
Circular Membrane ◽  
Shearing Flow ◽  
Dirac Delta ◽  
Forcing Term

AbstractThis paper aims to study the numerical features of a coupling scheme between the immersed boundary (IB) method and the lattice Boltzmann BGK (LBGK) model by four typical test problems: the relaxation of a circular membrane, the shearing flow induced by a moving fiber in the middle of a channel, the shearing flow near a non-slip rigid wall, and the circular Couette flow between two inversely rotating cylinders. The accuracy and robustness of the IB-LBGK coupling scheme, the performances of different discrete Dirac delta functions, the effect of iteration on the coupling scheme, the importance of the external forcing term treatment, the sensitivity of the coupling scheme to flow and boundary parameters, the velocity slip near non-slip rigid wall, and the origination of numerical instabilities are investigated in detail via the four test cases. It is found that the iteration in the coupling cycle can effectively improve stability, the introduction of a second-order forcing term in LBGK model is crucial, the discrete fiber segment length and the orientation of the fiber boundary obviously affect accuracy and stability, and the emergence of both temporal and spatial fluctuations of boundary parameters seems to be the indication of numerical instability. These elaborate results shed light on the nature of the coupling scheme and may benefit those who wish to use or improve the method.

scholarly journals Modeling and numerical simulation of the bubble cloud dynamics in an ultrasound field for burst wave lithotripsy

2018 ◽  
Vol 144 (3) ◽  
pp. 1780-1780
Author(s):  
Kazuki Maeda ◽  
Tim Colonius ◽  
Adam D. Maxwell ◽  
Wayne Kreider ◽  
Michael R. Bailey
Keyword(s):  
Numerical Simulation ◽  
Bubble Cloud ◽  
Ultrasound Field ◽  
Cloud Dynamics
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