The numerical analysis of a large diameter spherical valve

2018 ◽  
Vol 18 (5) ◽  
pp. 300
Author(s):  
Shidong Li ◽  
Zhiyong Wu
Keyword(s):  
Numerical Analysis ◽  
Large Diameter

Numerical Analysis of Flow-Induced Vibration of Large Diameter Pipe With Short Elbow

2017 ◽  
Author(s):  
Shigeru Takaya ◽  
Tatsuya Fujisaki ◽  
Masaaki Tanaka
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Fast Reactor ◽  
Pressure Fluctuation ◽  
Cooling System ◽  
Large Diameter ◽  
Recirculation Region ◽  
Flow Induced Vibration ◽  
Scaled Model ◽  
Energy Agency

Japan Atomic Energy Agency is now conducting design study and R&D of an advanced loop-type sodium cooled fast reactor. The cooling system is planned to be simplified by employing a two-loop configuration and shortened piping with less elbows than a prototype fast reactor in Japan, Monju, in order to reduce construction costs and enhance economic performance. The design, however, increases flow velocity in the hot-leg piping and induces large flow turbulence around elbows. Therefore, flow-induced vibration (FIV) of a hot-leg piping is one of main concerns in the design. Numerical simulation is a useful method to deal with such a complex phenomenon. We have been developing numerical analysis models of the hot-leg piping using Unsteady Reynolds Averaged Navier-Stokes simulation with Reynolds stress model. In this study, numerical simulation of a 1/3 scaled-model of the hot-leg piping was conducted. The results such as velocity profiles and power spectral densities (PSD) of pressure fluctuations were compared with experiment ones. The simulated PSD of pressure fluctuation at the recirculation region agreed well with the experiment, but it was found some underestimation at other parts, especially in relatively high frequency range. Eigenvalue vibration analysis was also conducted using a finite element method. Then, stress induced by FIV was evaluated using pressure fluctuation data calculated by URANS simulation. The calculated stress generally agrees well the measurement values, which indicates the importance of precise evaluation of the PSD of pressure fluctuation at the recirculation region for evaluation of FIV of the hot-leg piping with a short elbow.

The Numerical Analysis and Field Measurements of the Shield Tunnel Passing through the Pipeline Groups

2012 ◽  
Vol 226-228 ◽  
pp. 1488-1494
Author(s):  
Guan Shui Liu ◽  
Lian Wei Sun ◽  
Bo Wang ◽  
Shi Ming Wu ◽  
Cheng Po Hong ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Numerical Model ◽  
Water Pressure ◽  
Large Diameter ◽  
Field Measurements ◽  
Numerical Results ◽  
Shield Tunnel ◽  
Sewer Pipes

In this work, research was carried out based on the shield tunnel of metro line 1 in Hangzhou. The construction of this tunnel beneath the sewage pipelines, which have large diameter with water pressure. The project studied in this treatise is relatively rare in China in terms of sewer pipes, the number of sewers, spacing between shield and sewers and the crossing times. A numerical model was established to analyze the construction of metro across the sewage pipelines with water pressure, taking the interactions between tunnel, pipelines and soil into account. The stress of pipelines, settlement of pipelines and ground during the crossing process were calculated. The finite element results were compared with measured results to verify the reliability of numerical results. Some meaningful results were achieved.

Numerical analysis of large diameter wells with a seepage face — Comment

1990 ◽  
Vol 113 (1-4) ◽  
pp. 371-373 ◽  
Author(s):  
Robin Herbert ◽  
John A. Barker
Keyword(s):  
Numerical Analysis ◽  
Large Diameter ◽  
Seepage Face

scholarly journals Numerical Analysis of Synchronous Grouting Pressure for a Large Diameter Subsea Shield Tunnel in Rock Stratum

2021 ◽  
Vol 861 (5) ◽  
pp. 052090
Author(s):  
Wenqi Ding ◽  
Shuobiao Li ◽  
Xiaodong Zhang ◽  
Xiaoqing Chen ◽  
Qiushi Wang ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Large Diameter ◽  
Shield Tunnel ◽  
Rock Stratum ◽  
Grouting Pressure

Experimental and numerical analysis on thermal performance of large-diameter cast-in-place energy pile constructed in soft ground

Energy ◽  
2017 ◽  
Vol 118 ◽  
pp. 297-311 ◽  
Author(s):  
Sangwoo Park ◽  
Dongseop Lee ◽  
Seokjae Lee ◽  
Alexis Chauchois ◽  
Hangseok Choi
Keyword(s):  
Numerical Analysis ◽  
Thermal Performance ◽  
Large Diameter ◽  
Soft Ground ◽  
Energy Pile
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