scholarly journals Internal‐Pressure‐Wave Phenomena and Troposphere Winds

1965 ◽  
Vol 37 (6) ◽  
pp. 1208-1208
Author(s):  
Jessie M. Young ◽  
Howard S. Bowman
Keyword(s):  
Internal Pressure ◽  
Pressure Wave ◽  
Wave Phenomena

scholarly journals FIELD OBSERVATIONS OF WAVE PRESSURE, WAVE RUN-UP, AND OSCILLATION OF BREAKWATER

1966 ◽  
Vol 1 (10) ◽  
pp. 19 ◽  
Author(s):  
Yoshio Muraki
Keyword(s):  
Pressure Wave ◽  
Front Surface ◽  
Shock Pressure ◽  
Wave Forces ◽  
Field Observations ◽  
Progressive Wave ◽  
Wave Pressure ◽  
Scientists And Engineers ◽  
Run Up ◽  
Wave Phenomena

When a strong progressive wave collide against a shore structure, run-up and reflection of the wave take place on the front surface of the structure. At the same time, the structure is subjected to wave pressure resulting its oscillation or sometimes its sliding when the wave pressure is very large. Studies concerning such wave phenomena related to structures have been conducted by numerous scientists and engineers in many laboratories. While only a few investigations in the field have been made on these phenomena. At the same time it is noted that very few investigations have been carried out on the oscillation of breakwater caused by wave forces. The author performed some field observations on the wave pressure, wave run-up, and oscillation of breakwater at Haboro Harbor m Hokkaido, Japan, from 1957 to i960 (Refs. 1,2 and 3). In this paper the main results obtained from these observations such as the frequency of occurrence of shock pressure, the relationships among the run-up height, wave pressure and incident wave height, and the rocking phenomenon of the breakwater caused by wave pressure are summarized.

Analysis of Pressure Wave Phenomena in Steam Line Piping

2004 ◽  
Author(s):  
Juswald Vedovi ◽  
Michael J. Hibbard ◽  
Donald R. Todd ◽  
Kostadin Ivanov
Keyword(s):  
Pressure Wave ◽  
Reactor Core ◽  
Steam Line ◽  
Step Size ◽  
Time Step ◽  
Time Step Size ◽  
Bypass Line ◽  
Sensitivity Studies ◽  
Main Steam ◽  
Wave Phenomena

One challenging aspect of boiling water reactor (BWR) analysis is the ability to predict the system response following the rapid closure of a steam line control or isolation valve. Of particular interest is to accurately model the effect of a pressurization wave as it transits through the reactor core. This paper describes sensitivity studies, which were performed to demonstrate the predictive capabilities of S-RELAP5 for analysis of pressure wave phenomena, and it describes the steam line models developed in support of this effort. S-RELAP5 is a RELAP5-based thermal-hydraulic system code used for realistic analyses of large break loss-of-coolant accidents (LBLOCA) in pressurized water reactors (PWRs). The code is also suitable for analyzing PWR small break LOCA and non-LOCA transients. On the extent of the analyses documented in this paper, there are not significant differences between S-RELAP5 and RELAP5. Framatome ANP is developing code models which will extend the capability of S-RELAP5 to analyze BWR transients. Within the framework of this development work, a task was established to investigate the capability of S-RELAP5 to model transients involving steam line pressure wave phenomena. An additional goal of this task was development of a steam line nodalization guideline for modeling pressurization transients. To achieve these goals, various steam line models were investigated and a series of sensitivity studies were performed using the Peach Bottom Unit 2 Turbine Trip test series as an experimental benchmark. A Turbine Trip is an anticipated operational occurrence (AOO), which, for analysis purposes, is initiated by rapid closure of the Turbine Stop Valves (TSV). The pressure oscillation generated in the main steam piping propagates with relatively little attenuation into the reactor core. The induced core pressure oscillation results in dramatic changes to the core void distribution and coolant flow. The magnitude of the resulting neutron flux transient is significantly affected by the void collapse. The performed sensitivity studies focused on steam line geometry, time step size, steam line node length, Turbine Stop Valve (TSV) model, steam Bypass Valve (BPV), and transient boundary conditions. Three models were developed for the Peach Bottom Unit 2 steam line; a single ideal steam line with no bends or elevation changes, a four steam line model of the PB2 main steam and bypass line piping, and an equivalent single steam line model of the PB2 main steam and bypass line piping. The pressure response calculated by S-RELAP5 was compared to theoretical predictions based on fundamental water-hammer equations and to experimental data from the PB2 turbine trip tests (TT1, TT2, and TT3). The results demonstrate the capability of S-RELAP5 to accurately predict pressure wave phenomena. Additional results of this work include recommendations of appropriate values for time step size and steam line node size. Models for the TSV and BPV were developed based on TT2 information, and validated through analysis of TT1 and TT3. Finally, the results of this work demonstrate the strong interaction between the steam bypass line and the main steam line, and the corresponding impact on system pressure response.

Pressure wave phenomena in bubbly liquid

1993 ◽  
Vol 141 (1-2) ◽  
pp. 123-134 ◽  
Author(s):  
Y. Matsumoto ◽  
M. Kameda
Keyword(s):  
Pressure Wave ◽  
Bubbly Liquid ◽  
Wave Phenomena

Pressure wave phenomena in bubbly liquid

1990 ◽  
Author(s):  
Yoichiro Matsumoto ◽  
Hideji Nishikawa ◽  
Taku Ohara ◽  
Hideo Ohashi
Keyword(s):  
Pressure Wave ◽  
Bubbly Liquid ◽  
Wave Phenomena

Fundamentals of Wave Phenomena

2010 ◽  
Author(s):  
Akira Hirose ◽  
Karl E. Lonngren
Keyword(s):  
Wave Phenomena

Simulation of vibration piercing of pipe blank at press

2020 ◽  
Vol 76 (11) ◽  
pp. 1128-1138
Author(s):  
S. R. Rakhmanov
Keyword(s):  
High Frequency ◽  
Deformation Zone ◽  
Pipe Blank ◽  
Equipment Operation ◽  
Metal Deformation ◽  
Technological Tool ◽  
High Frequency Vibrations ◽  
Pipe Blanks ◽  
Wave Phenomena

In some cases, the processes of piercing or expanding pipe blanks involve the use of high-frequency active vibrations. However, due to insufficient knowledge, these processes are not widely used in the practice of seamless pipes production. In particular, the problems of increasing the efficiency of the processes of piercing or expanding a pipe blank at a piercing press using high-frequency vibrations are being solved without proper research and, as a rule, by experiments. The elaboration of modern technological processes for the production of seamless pipes using high-frequency vibrations is directly related to the choice of rational modes of metal deformation and the prediction resistance indicators of technological tools and the reliability of equipment operation. The creation of a mathematical model of the process of vibrating piercing (expansion) of an axisymmetric pipe blank at a piercing press of a pipe press facility is an actual task. A calculation scheme for the process of piercing a pipe plank has been elaborated. A dependence was obtained characterizing the speed of front of plastic deformation propagation on the speed of penetration of a vibrated axisymmetric mandrel into the pipe workpiece being pierced. The dynamic characteristics of the occurrence of wave phenomena in the metal being pierced under the influence of a vibrated tool have been determined, which significantly complements the previously known ideas about the stress-strain state of the metal in the deformation zone. The deformation fields in the zones of the disturbed region of the deformation zone were established, taking into account the high-frequency vibrations of the technological tool. It has been established that the choice of rational parameters (amplitude-frequency characteristics) of the vibration piercing process of a pipe blank results in significant increase in the efficiency of the process, the durability of the technological tool and the quality of the pierced blanks.

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