Numerical study of dam-break fluid flow using volume of fluid (VOF) methods for different angles of inclined planes

SIMULATION ◽

10.1177/00375497211008497 ◽

2021 ◽

pp. 003754972110084

Author(s):

Alibek Issakhov ◽

Yeldos Zhandaulet

Keyword(s):

Pressure Distribution ◽

Numerical Study ◽

Computational Simulation ◽

Measurement Data ◽

Dam Break ◽

Maximum Pressure ◽

Dam Break Flow ◽

New Form ◽

Inclined Angle ◽

Inclined Planes

In this paper, the effects of water on obstacles in dam-break flow for different angles of the inclined planes have been numerically examined. The presented computational data are compared with data from the experiment and computational simulation data of other authors. Good agreements between the obtained simulation results and measurement data demonstrate the satisfactory performance of the mathematical model and the numerical algorithm when reproducing a dam-break flow. Additionally, various problems were also considered: the effect of pressure distribution on the dam walls for different angles of the inclined plane. It was found that pressure distribution on the wall when the inclined angle [Formula: see text] = 15° was almost two times more than without inclination. To reduce the shock pressure value a new form of obstacle was used. With a new form of obstacle, the maximum pressure value on the dam wall decreased more than three times.

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Stochastic Uncertainty in a Dam-Break Experiment with Varying Gate Speeds

Journal of Marine Science and Engineering ◽

10.3390/jmse9010067 ◽

2021 ◽

Vol 9 (1) ◽

pp. 67

Author(s):

Hiroshi Takagi ◽

Fumitaka Furukawa

Keyword(s):

High Speed ◽

Pressure Sensors ◽

Dam Break ◽

Maximum Pressure ◽

Vertical Acceleration ◽

Ship Wakes ◽

Dam Break Flow ◽

Statistical Relationships ◽

Flow Propagation ◽

Impulsive Pressure

Uncertainties inherent in gate-opening speeds are rarely studied in dam-break flow experiments due to the laborious experimental procedures required. For the stochastic analysis of these mechanisms, this study involved 290 flow tests performed in a dam-break flume via varying gate speeds between 0.20 and 2.50 m/s; four pressure sensors embedded in the flume bed recorded high-frequency bottom pressures. The obtained data were processed to determine the statistical relationships between gate speed and maximum pressure. The correlations between them were found to be particularly significant at the sensors nearest to the gate (Ch1) and farthest from the gate (Ch4), with a Pearson’s coefficient r of 0.671 and −0.524, respectively. The interquartile range (IQR) suggests that the statistical variability of maximum pressure is the largest at Ch1 and smallest at Ch4. When the gate is opened faster, a higher pressure with greater uncertainty occurs near the gate. However, both the pressure magnitude and the uncertainty decrease as the dam-break flow propagates downstream. The maximum pressure appears within long-period surge-pressure phases; however, instances considered as statistical outliers appear within short and impulsive pressure phases. A few unique phenomena, which could cause significant bottom pressure variability, were also identified through visual analyses using high-speed camera images. For example, an explosive water jet increases the vertical acceleration immediately after the gate is lifted, thereby retarding dam-break flow propagation. Owing to the existence of sidewalls, two edge waves were generated, which behaved similarly to ship wakes, causing a strong horizontal mixture of the water flow.

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Numerical Study of 2D and 3D Separation Phenomena in the Dam-Break Flow Interacting with a Triangular Obstacle

Periodica Polytechnica Mechanical Engineering ◽

10.3311/ppme.8948 ◽

2016 ◽

Vol 60 (3) ◽

pp. 159-166 ◽

Cited By ~ 1

Author(s):

Alexander Khrabry ◽

◽

Evgueni Smirnov ◽

Dmitry Zaytsev ◽

Valery Goryachev ◽

...

Keyword(s):

Numerical Study ◽

Dam Break ◽

Dam Break Flow ◽

2D And 3D

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A NUMERICAL STUDY OF DAM-BREAK FLOW AND SEDIMENT TRANSPORT FROM A QUAKE LAKE

Journal of Earthquake and Tsunami ◽

10.1142/s1793431111001169 ◽

2011 ◽

Vol 05 (05) ◽

pp. 401-428 ◽

Cited By ~ 9

Author(s):

PENGZHI LIN ◽

YINNA WU ◽

JUNLI BAI ◽

QUANHONG LIN

Keyword(s):

Sediment Transport ◽

Shallow Water ◽

High Speed ◽

Numerical Study ◽

Shallow Water Equation ◽

Equation Model ◽

Dam Break ◽

Bed Morphology ◽

Dam Break Flow ◽

Quake Lake

Dam-break flows are simulated numerically by a two-dimensional shallow-water-equation model that combines a hydrodynamic module and a sediment transport module. The model is verified by available analytical solutions and experimental data. It is demonstrated that the model is a reliable tool for the simulation of various transient shallow water flows and the associated sediment transport and bed morphology on complex topography. The validated model is then applied to investigate the potential dam-break flows from Tangjiashan Quake Lake resulting from Wenchuan Earthquake in 2008. The dam-break flow evolution is simulated by using the model in order to provide the flooding patterns (e.g., arrival time and flood height) downstream. Furthermore, the sediment transport and bed morphology simulation is performed locally to study the bed variation under the high-speed dam-break flow.

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