Experimental and Numerical Simulation of Water Hammer

2014 ◽  
Vol 39 (4) ◽  
pp. 2669-2675 ◽  
Author(s):  
M. R. Nikpour ◽  
A. H. Nazemi ◽  
A. Hosseinzadeh Dalir ◽  
F. Shoja ◽  
P. Varjavand
Keyword(s):  
Numerical Simulation ◽  
Water Hammer

Numerical simulation and optimization on valve-induced water hammer characteristics for parallel pump feedwater system

2008 ◽  
Vol 35 (12) ◽  
pp. 2280-2287 ◽  
Author(s):  
Wenxi Tian ◽  
G.H. Su ◽  
Gaopeng Wang ◽  
Suizheng Qiu ◽  
Zejun Xiao
Keyword(s):  
Numerical Simulation ◽  
Water Hammer ◽  
Simulation And Optimization

Research on Coupled Water Hammer in Hydraulic Pipe System

2010 ◽  
Vol 29-32 ◽  
pp. 401-406 ◽  
Author(s):  
Jin Jun Liao ◽  
Bao Ren Li
Keyword(s):  
Numerical Simulation ◽  
Pressure Fluctuations ◽  
Mathematic Model ◽  
Water Hammer ◽  
One Dimensional ◽  
Pipe System ◽  
System Parameters ◽  
Simulation And Experiment ◽  
Pressure Characteristics

A one-dimensional mathematic model is presented which describes pressure fluctuations behavior of liquid-filled pipes. The model is based on conventional two-equations water hammer theory. Here is multi-water-hammer occurring simultaneously and coupling together. The differences are obvious when taking into account coupled water hammer and just single water hammer in Fluid pipe system by comparing the numerical simulation. The pressure characteristics located where water hammer takes place is investigated by numerical simulation and experiment. Then the factors of influencing on the coupled water-hammer pressure and frequency are considered, the result shows that system parameters effecting on it are critical and should be detailedly analyzed.

Numerical Simulation and Analysis of Hydraulic Excitation System Based on Water Hammer by the Method of Characteristics

2011 ◽  
Vol 295-297 ◽  
pp. 2210-2215 ◽  
Author(s):  
Hui Xian Zhang ◽  
Zi Ming Kou ◽  
Juan Wu ◽  
Chun Yue Lu
Keyword(s):  
Numerical Simulation ◽  
Method Of Characteristics ◽  
Experimental System ◽  
Water Hammer ◽  
Vibration Exciter ◽  
Transient Pressure ◽  
Excitation System ◽  
The Method Of Characteristics ◽  
System Pressure ◽  
Excitation Pressure

To study artificially produced and actively controlled water hammer wave caused by hydraulic vibration exciter, a mathematical model was established and an experimental system was designed to verify it. Through the given partial differential equations, a computer code based on the method of characteristics was developed to calculate transient pressure distributed along the pipe under different rotational frequency of vibration exciter. The numerical simulation indicates that there is a simple harmonic vibration rising at the cross sections along the pipe, corresponding to different excitation pressure at every cross section. In addition, the excitation pressure can also be adjusted by system pressure via overflow valve. So, this work is expected to serve for the optimum design of the hydraulic excitation system and play a theoretical guiding role to experimental research in future.

Study on Setting of One-Way Surge Tank in Long Water Supply Engineering

2008 ◽  
Author(s):  
Jianyong Hu ◽  
Jian Zhang ◽  
Weihua Lu ◽  
Shibo Ma
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Water Supply ◽  
Negative Pressure ◽  
Water Hammer ◽  
Surge Tank ◽  
Proper Place ◽  
Column Separation ◽  
Important Measure ◽  
Engineering Principle

One-way surge tank is an important measure of water hammer protection in long water supply engineering. It can control the negative pressure efficiently and prevent pipeline from column separation. Setting one-way surge tank in proper place along pipeline is relative to the safety of long water supply engineering. Principle of Setting one-way surge tank is made through theoretical analysis detailedly. It is obviously that result of theoretical analysis is conservative because attenuation of water hammer is ignored, but theoretical analysis provide an proper approach for setting one-way surge tank. Based on result of theoretical analysis, optimization setting is obtained through numerical simulation.

scholarly journals Evaluation of Water Hammer for Seawater Treatment System in Offshore Floating Production Unit

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1041
Author(s):  
Jun Sung Park ◽  
Quang Khai Nguyen ◽  
Gang Nam Lee ◽  
Kwang Hyo Jung ◽  
Hyun Park ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Characteristics ◽  
Water Hammer ◽  
Treatment System ◽  
Closing Time ◽  
Simulation Tools ◽  
Transient Experiments ◽  
Significant Damage ◽  
Seawater Treatment ◽  
1D Numerical Simulation

Water hammer can result in the rupture of pipes, and significant damage to pipe supports is inevitable during the operation of an offshore plant. In this study, the dynamic behaviors of the water hammer caused by closing valves and starting pumps for the seawater treatment system were evaluated by using the 1D numerical simulation model based on the method of characteristics. Before conducting an analysis of a complex piping network, the 1D numerical simulation tools were validated by a comparison between the numerical results and the results from both static and transient experiments that have been conducted in other studies. For the case study, the effects of valve flow characteristics and valve closing time on surge pressure were investigated, and the equal percentage butterfly valve was recommended in order to reduce the surge pressure with a shorter valve closure time and lower weight compared to other valve types.

Water Hammer Induced Vibration of a Fluid Filled Pipe

2005 ◽  
Author(s):  
Yi Jia ◽  
Ezequiel Me´dici ◽  
Frederick Just-Agosto ◽  
David Serrano ◽  
Luciano Castillo
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Flow Rate ◽  
Vibration Frequency ◽  
Water Hammer ◽  
Maximum Pressure ◽  
Fluid Flow Rate ◽  
Geometrical Configuration ◽  
Vibration Equation ◽  
Classical Formulation

The objectives of this study are to analyze the behavior of a pipe under different valve open and closure times and to predict water hammer-induced transient maximum pressure, deflection and frequency of vibration in a fluid filled pipe. The model that integrated a classical formulation of water hammer problem and beam vibration equation was developed and a numerical simulation including frictional losses has been carried out. The MacCormak and Runge-Kutta methods were used to solve governing partial differential equations in order to investigate water hammer induced vibration of a fluid filled pipe. The results show that fluid flow rate does not change the vibration frequency of pipe. The peak wave pressures, maximum pipe deflections at various valve open and closure times, and the frequencies of vibration with variation of fluid speed and pipe geometrical configuration are presented.

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