Development of an experimental setup for micro flow measurement using the front tracking method

AbstractIn this paper, we extend using the Runge-Kutta discontinuous Galerkin method together with the front tracking method to simulate the compressible two-medium flow on unstructured meshes. A Riemann problem is constructed in the normal direction in the material interfacial region, with the goal of obtaining a compact, robust and efficient procedure to track the explicit sharp interface precisely. Extensive numerical tests including the gas-gas and gas-liquid flows are provided to show the proposed methodologies possess the capability of enhancing the resolutions nearby the discontinuities inside of the single medium flow and the interfacial vicinities of the two-medium flow in many occasions.

Download Full-text

A Front-Tracking Method for Multiphase Flows with a Sharp Interface Representation

Notes on Numerical Fluid Mechanics and Multidisciplinary Design - Turbulence and Interactions ◽

10.1007/978-3-030-65820-5_21 ◽

2021 ◽

pp. 189-195

Author(s):

Mathilde Tavares ◽

Désir-André Koffi Bi ◽

Eric Chénier ◽

Stéphane Vincent

Keyword(s):

Multiphase Flows ◽

Front Tracking ◽

Sharp Interface ◽

Tracking Method ◽

Front Tracking Method

Download Full-text

Analysis of dynamic characteristics of bubble rise under a free surface

Canadian Journal of Physics ◽

10.1139/cjp-2019-0505 ◽

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.

Download Full-text

Numerical Simulation of Bubble Free Rise after Sudden Contraction Using the Front-Tracking Method

International Journal of Photoenergy ◽

10.1155/2017/5128345 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8

Author(s):

Ying Zhang ◽

Min Lu ◽

Wenqiang Shang ◽

Zhen Xia ◽

Liang Zeng ◽

...

Keyword(s):

Numerical Simulation ◽

Reynolds Number ◽

Front Tracking ◽

Single Bubble ◽

Tracking Method ◽

Front Tracking Method ◽

Sudden Contraction ◽

Eotvos Number

Based on the front-tracking method (FTM), the movement of a single bubble that rose freely in a transverse ridged tube was simulated to analyze the influence of a contractive channel on the movement of bubbles. The influence of a symmetric contractive channel on the shape, speed, and trajectory of the bubbles was analyzed by contrasting the movement with bubbles in a noncontractive channel. As the research indicates, the bubbles became more flat when they move close to the contractive section of the channel, and the bubbles become less flat when passing through the contractive section. This effect becomes more obvious with an increase in the contractive degree of the channel. The symmetric contractive channel can make the bubbles first decelerate and later accelerate, and this effect is deeply affected by Reynolds number (Re) and Eötvös number (Eo).

Download Full-text