Study on temperature oscillation phenomenon in FEM numerical simulation

2013 ◽  
Author(s):  
Bo Shen ◽  
Tao Fan ◽  
Zaiyong Pan ◽  
Quanlin jin ◽  
Xinyun Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Oscillation ◽  
Oscillation Phenomenon ◽  
Fem Numerical Simulation

FEM numerical simulation of the warm and hot upsetting sliding test

2010 ◽  
Vol 3 (S1) ◽  
pp. 315-318
Author(s):  
E. Vidal-Sallé ◽  
M. Dubar ◽  
J-C. Boyer ◽  
L. Dubar
Keyword(s):  
Numerical Simulation ◽  
Sliding Test ◽  
Fem Numerical Simulation

Study on FEM Numerical Simulation and Strain Monitoring of Tunnel Secondary Lining

2014 ◽  
Vol 580-583 ◽  
pp. 1105-1111
Author(s):  
Ying Na Li ◽  
Meng Liu ◽  
Sheng Wu ◽  
Hao Liu ◽  
Jian Kun Su ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Comparative Study ◽  
Monitoring Method ◽  
Strain Monitoring ◽  
Site Monitoring ◽  
Secondary Lining ◽  
Rock Tunnel ◽  
The Comparative Study ◽  
Fem Numerical Simulation

Safety of secondary lining is of utmost importance to tunnel engineering quality as the main load-bearing structure and the last waterproof line of rock tunnel under type III. The comparative study of strain state results from FEM numerical simulation and on-site monitoring in Yunnan Tianxin Tunnel was conducted to obtain the stress regularity of tunnel lining. The results showed that except vault, the strain states of secondary lining obtained by numerical simulation and on-site monitoring were consistent. The strain value of on-site monitoring was approximately 60%~70% to the simulation value. And the strain value of right side was greater than the value of the corresponding location on the left side. It’s noticed that high strain were found in tunnel haunch and arch springing. Great attention should be paid to arch springing for the largest strain value. The strain monitoring value of vault (309.83με~327.23με) has been detected larger than simulation value (209.37με), which matches well the crack phenomenon of vault. Therefore it’s significant to focus on the long-term monitoring of vault. The defects of single on-site monitoring method such as poor predictability were made up effectively by comparative study. The results achieved can be recommended for similar projects.

scholarly journals Temperature oscillation in one-dimensional superlattice induced by phonon localization

2021 ◽  
Author(s):  
Longkai Lu ◽  
Dengke Ma ◽  
Ming Zhong ◽  
Lifa Zhang
Keyword(s):  
Temperature Gradient ◽  
High Frequency ◽  
Temperature Oscillation ◽  
Thermodynamic Quantities ◽  
Localized Modes ◽  
One Dimensional ◽  
Oscillation Phenomenon ◽  
Low Dimensional ◽  
Phonon Localization ◽  
Good Agreement

Abstract Thermal transport properties and thermodynamic quantities often present anomalous behaviors in low-dimensional systems. In this paper, we find that temperature oscillates spatially in one dimensional harmonic and weakly anharmonic superlattice. With the increase of anharmonicity, the temperature oscillation gradually disappears and a normal temperature gradient forms. Further analysis reveals that the formation of temperature oscillation is due to the localization of high frequency phonons which cannot be thermalized. Moreover, the localized modes interact weakly with heat reservoirs, thus, their contributions to local temperature remain negligible while varying the temperatures of heat reservoirs. The oscillated temperature profile is in a good agreement with Visscher's formula. These discoveries of temperature oscillation phenomenon have great potential in applications of phononic devices for heat manipulation.

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