Composite infinite element analysis of unbounded two-phase media

1988 ◽  
Vol 10 (4) ◽  
pp. 202-209 ◽  
Author(s):  
Gopal.R. Karpurapu
Keyword(s):  
Two Phase ◽  
Element Analysis ◽  
Infinite Element

Crack Growth Prediction and Leakage Potential of Steam Generator Tubes Subjected to Flow Induced Vibrations

2014 ◽  
Author(s):  
Salim El Bouzidi ◽  
Marwan Hassan ◽  
Jovica Riznic
Keyword(s):  
Crack Growth ◽  
Steam Generator ◽  
Power Plants ◽  
Mechanical Energy ◽  
Steam Generators ◽  
Two Phase ◽  
Element Analysis ◽  
Wide Range ◽  
Flow Induced Vibrations ◽  
Crack Growth Model

Nuclear steam generators are critical components of nuclear power plants. Flow-Induced Vibrations (FIV) are a major threat to the operation of nuclear steam generators. The two main manifestations of FIV in heat exchangers are turbulence and fluidelastic instability, which would add mechanical energy to the system resulting in great levels of vibrations. The consequences on the operation of steam generators are premature wear of the tubes, as well as development of cracks that may leak radioactive heavy water. This paper investigates the effect of tube support clearance on crack propagation. A crack growth model is used to simulate the growth of Surface Flaws and Through-Wall Cracks of various initial sizes due to a wide range of support clearances. Leakage rates are predicted using a two-phase flow leakage model. Non-linear finite element analysis is used to simulate a full U-bend subjected to fluidelastic and turbulence forces. Monte Carlo Simulations are then used to conduct a probabilistic assessment of steam generator life due to crack development.

scholarly journals A New Capacitance Sensor for Measuring the Void Fraction of Two-Phase Flow Through Tube Bundles

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2088
Author(s):  
Wael Ahmed ◽  
Adib Fatayerji ◽  
Ahmed Elsaftawy ◽  
Marwan Hassan ◽  
David Weaver ◽  
...  
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Tube Bundle ◽  
Local Variation ◽  
Phase Flow ◽  
Capacitance Sensor ◽  
Two Phase ◽  
Element Analysis ◽  
Tube Bundles ◽  
The Stability

Evaluating the two-phase flow parameters across tube bundles is crucial to the analysis of vibration excitation mechanisms. These parameters include the temporal and local variation of void fraction and phase redistribution. Understanding these two-phase parameters is essential to evaluating the stability threshold of tube bundle configurations. In this work, capacitance sensor probes were designed using finite element analysis to ensure high sensor sensitivity and optimum response. A simulation-based approach was used to calibrate and increase the accuracy of the void fraction measurement. The simulation results were used to scale the normalized capacitance and minimize the sensor uncertainty to ±5%. The sensor and required conditioning circuits were fabricated and tested for measuring the instantaneous void fraction in a horizontal triangular tube bundle array under both static and dynamic two-phase flow conditions. The static calibration of the sensor was able to reduce the uncertainty to ±3% while the sensor conditioning circuit was able to capture instantaneous void fraction signals with frequencies up to 2.5 kHz.

The 3-D Finite Element Analysis on Elastic-Plastic Micromechanical Response of the Particle Volume Fraction

2019 ◽  
Vol 962 ◽  
pp. 210-217
Author(s):  
Yong Ming Guo ◽  
Nozomi Fukae
Keyword(s):  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Three Dimensional ◽  
Particle Volume ◽  
Two Phase ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Microstructural Parameters ◽  
Commercial Software Package ◽  
Properties Of Materials

It is well known that the properties of materials are a function of their microstructural parameters. The FEM is a good selection for studies of three-dimensional microstructure-property relationships. In this research, the elastic-plastic micromechanical response of the particle volume fraction of two-phase materials have been calculated using a commercial software package of the FEM, some new knowledges on the microstructure-property relationships have obtained.

scholarly journals Two-Phase Linear Hybrid Reluctance Actuator with Low Detent Force

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5162
Author(s):  
Jordi Garcia-Amorós ◽  
Marc Marín-Genescà ◽  
Pere Andrada ◽  
Eusebi Martínez-Piera
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Permanent Magnets ◽  
Thrust Force ◽  
Experimental Tests ◽  
Force Density ◽  
Two Phase ◽  
Element Analysis ◽  
Switched Reluctance ◽  
Detent Force

In this paper, a novel two-phase linear hybrid reluctance actuator with the double-sided segmented stator, made of laminated U cores, and an interior mover with permanent magnets is proposed. The permanent magnets are disposed of in a way that increases the thrust force of a double-sided linear switched reluctance actuator of the same size. To achieve this objective, each phase of the actuator is powered by a single H-bridge inverter. To reduce the detent force, the upper and the lower stator were shifted. Finite element analysis was used to demonstrate that the proposed actuator has a high force density with low detent force. In addition, a comparative study between the proposed linear hybrid reluctance actuator, linear switched reluctance, and linear permanent magnet actuators of the same size was performed. Finally, experimental tests carried out in a prototype confirmed the goals of the proposed actuator.

scholarly journals The Finite Element Analysis for a Mini-Conductance Probe in Horizontal Oil-Water Two-Phase Flow

Sensors ◽  
2016 ◽  
Vol 16 (9) ◽  
pp. 1352 ◽  
Author(s):  
Weihang Kong ◽  
Lingfu Kong ◽  
Lei Li ◽  
Xingbin Liu ◽  
Ronghua Xie ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Conductance Probe ◽  
Oil Water

Analysis of the corner effect on excavation behaviors

1998 ◽  
Vol 35 (3) ◽  
pp. 532-540 ◽  
Author(s):  
Chang-Yu Ou ◽  
Bor-Yuan Shiau
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Case Histories ◽  
Element Analysis ◽  
Corner Effect ◽  
Large Computer ◽  
Infinite Element ◽  
Dimensional Finite Element ◽  
Wall Deformation ◽  
Three Dimensional Finite Element

This paper presents three-dimensional finite-element studies on excavation problems. Large computer storage and computation time are normally required for the conventional finite-element analysis, for which the boundary should be located distant from the excavation zone so that convergence can be reached. In this paper the infinite element is incorporated into a three-dimensional finite-element computer program for minimizing the number of elements used. Research results indicate that adequate convergence for the wall deflection and ground surface settlement is obtained for infinite elements located at a distance of one wall depth. This substantially reduces the number of elements used in the analysis. Furthermore, two excavation case histories are provided to confirm the appropriateness of employing the infinite element as well as the corner effect on the deformation behavior. Based on the field observations and three-dimensional analysis of the case histories, it is found that the wall deformation at the short wall is smaller than that at the long wall. The wall deformation decreases with decreasing distance from the corner. These studies further verify the corner effect on the excavation behavior.Key words: Corner effect, Finite-element method, Deep excavation, Infinite element

GA Wavelet Transform Direction for γ-Phase Shaped Finite Element Analysis

2013 ◽  
Vol 791-793 ◽  
pp. 573-576
Author(s):  
Lei Meng
Keyword(s):  
Finite Element ◽  
Single Crystal ◽  
Phase Distribution ◽  
Tensile Creep ◽  
Von Mises Stress ◽  
Initial Population ◽  
Two Phase ◽  
Element Analysis ◽  
Multimodal Function ◽  
Von Mises

1040 °C was studied during the period imposed 137MPa tensile creep nickel-base single crystal superalloys γ/γ the evolution of two-phase approach. ANSYS finite element method is using a single crystal alloy with / without external load when the Von Mises stress in the gand γ two phase distribution. The comprehensive analysis of the formula, the coefficient values usually experience, not very accurate, this article dealing with GA coefficient. This algorithm uses orthogonal crossover to generate initial population and uses elitist-crossover to increase the good patterns of the population and uses hybrid mutation to increase the ability of local and global optimization. It has shown fascinating results when being used in the optimization of multimodal function. The results showed that: In the creep period, the corresponding cubic γ along the von Mises stress and strain energy density of the crystal face to form raft-like organizations.

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