A multiscale front tracking method for compressible free surface flows

2007 ◽  
Vol 62 (13) ◽  
pp. 3538-3548 ◽  
Author(s):  
Zhiliang Xu ◽  
James Glimm ◽  
Yongmin Zhang ◽  
Xinfeng Liu
Keyword(s):  
Free Surface ◽  
Front Tracking ◽  
Free Surface Flows ◽  
Surface Flows ◽  
Tracking Method ◽  
Front Tracking Method

Analysis of dynamic characteristics of bubble rise under a free surface

2020 ◽  
Vol 98 (11) ◽  
pp. 981-992
Author(s):  
Ying Zhang ◽  
Qiang Liu ◽  
Wenbin Li ◽  
Xiaolong Lian ◽  
Jinglun Li ◽  
...  
Keyword(s):  
Free Surface ◽  
Immersed Boundary Method ◽  
Weber Number ◽  
Front Tracking ◽  
Terminal Velocity ◽  
Immersed Boundary ◽  
Tracking Method ◽  
Free Interface ◽  
Front Tracking Method ◽  
Moving Interface

The rising process of a bubble occurs in several natural and industrial apparatuses. This process is computationally studied using the front tracking method for a moving interface whose surface properties are solved in terms of an immersed-boundary method. The results show that the free interface does not influence the bubble before the centroid velocity of the bubble reaches the terminal velocity, which reaches a stable value or fluctuates at it, with the distance h (between the centroid of the bubble and the free surface) reaching a certain value. When the Reynolds number increases, the time to reach terminal velocity will decrease, and the influence of the viscous factor on the terminal velocity is also weakened. The dramatic interaction between a bubble and free surface is beneficial to accelerate film draining out. It is also shown that the shape of the bubble gradually becomes an ellipse as the Weber number (We) decreases, and it is beneficial to reduce the resistance of the bubble. The free surface could accelerate the bubble breaking at high We values.

scholarly journals Numerical simulation of water free-surface flows through a front-tracking lattice Boltzmann approach

2014 ◽  
Vol 17 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Silvia Di Francesco ◽  
Chiara Biscarini ◽  
Piergiorgio Manciola
Keyword(s):  
Free Surface ◽  
Lattice Boltzmann ◽  
Volume Fraction ◽  
Analytical Data ◽  
Front Tracking ◽  
Free Surface Flows ◽  
Liquid Volume ◽  
Engineering Applications ◽  
Surface Flows ◽  
Practical Engineering

Three-dimensional (3D) hydraulic modelling of rapidly varying surface flows is a challenging task for practical engineering applications. One example is represented by the fast-moving fronts originating from dam breaches that proceed downstream through artificial channels. In this work, a fully 3D lattice Boltzmann method (LBM) is tested. The numerical model is a front-tracking variant of the LBM, being the free surface tracked through the liquid volume fraction. Model performances are evaluated simulating the effect of dam-break flows on synthetic settings schematically represented by an artificial domain and comparing results with analytical data and experimental laboratory measurements. Obtained results are promising for the use of LBM for practical engineering applications.

scholarly journals Single Bubble Bouncing on a Free Surface and a Rigid Wall with a Front-tracking Method

2012 ◽  
Vol 26 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Toshiyuki OYAMA ◽  
Satosh II ◽  
Kazuyasu SUGIYAMA ◽  
Shintaro TAKEUCHI ◽  
Shu TAKAGI ◽  
...  
Keyword(s):  
Free Surface ◽  
Front Tracking ◽  
Rigid Wall ◽  
Single Bubble ◽  
Tracking Method ◽  
Front Tracking Method
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