scholarly journals Iterative coupling between the MFS and Kansa’s method for acoustic problems

2013 ◽  
Author(s):  
L. Godinho ◽  
D. Soares ◽  
A. Pereira ◽  
C. Dors
Keyword(s):  
Iterative Coupling

Performance Evaluation of Numerical Finite Element Coupled Algorithms for Structure–Electric Interaction Analysis of MEMS Piezoelectric Actuator

2019 ◽  
Vol 16 (07) ◽  
pp. 1850106 ◽  
Author(s):  
Prakasha Chigahalli Ramegowda ◽  
Daisuke Ishihara ◽  
Tomoya Niho ◽  
Tomoyoshi Horie
Keyword(s):  
Finite Element ◽  
Piezoelectric Actuator ◽  
3D Structure ◽  
Time Integration ◽  
Low Frequency ◽  
Piezoelectric Actuators ◽  
Piezoelectric Bimorph ◽  
Iterative Coupling ◽  
Electric Interaction ◽  
Numerical Finite Element

This work presents multiphysics numerical analysis of piezoelectric actuators realized using the finite element method (FEM) and their performances to analyze the structure-electric interaction in three-dimensional (3D) piezoelectric continua. Here, we choose the piezoelectric bimorph actuator without the metal shim and with the metal shim as low-frequency problems and a surface acoustic wave device as a high-frequency problem. More attention is given to low-frequency problems because in our application micro air vehicle’s wings are actuated by piezoelectric bimorph actuators at low frequency. We employed the Newmark’s time integration and the central difference time integration to study the dynamic response of piezoelectric actuators. Monolithic coupling, noniterative partitioned coupling and partitioned iterative coupling schemes are presented. In partitioned iterative coupling schemes, the block Jacobi and the block Gauss–Seidel methods are employed. Resonance characteristics are very important in micro-electro-mechanical system (MEMS) applications. Therefore, using our proposed coupled algorithms, the resonance characteristics of bimorph actuator is analyzed. Comparison of the accuracy and computational efficiency of the proposed numerical finite element coupled algorithms have been carried out for 3D structure–electric interaction problems of a piezoelectric actuator. The numerical results obtained by the proposed algorithms are in good agreement with the theoretical solutions.

scholarly journals An Assessment of Stress States in Passive Margin Sediments: Iterative Hydro-Mechanical Simulations on Basin Models and Implications for Rock Failure Predictions

Geosciences ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 469 ◽  
Author(s):  
Bouziat ◽  
Guy ◽  
Frey ◽  
Colombo ◽  
Colin ◽  
...  
Keyword(s):  
Careful Consideration ◽  
Rock Failure ◽  
Hydrocarbon Exploration ◽  
Passive Margin ◽  
Geological Time ◽  
Iterative Coupling ◽  
Modelling Studies ◽  
Failure Predictions ◽  
Stress States ◽  
Strong Control

Capturing the past and present hydro-mechanical behavior of passive margin sediments raises noticeable interest, notably in geo-hazard risk assessment and hydrocarbon exploration. In this work, we aim at assessing the stress states undergone by these sedimentary deposits through geological time. To do so, we use an iterative coupling between a basin simulator and a finite element mechanical solver. This method conciliates a computation of the full stress tensors with a dynamic and geologically detailed modelling of the sedimentation. It is carried out on a dedicated set of 2D synthetic basin models, designed to be representative of siliciclastic deposition in passive margins and integrating variations in their geological history. Contrary to common assumptions in operational basin modelling studies, our results imply that passive margin sedimentary wedges are multidimensional mechanical systems, which endure significant non-vertical stress without external tectonic input. Our results also highlight the variability of the stress states through space and time, with a strong control from the geometry and lithological heterogeneities of the deposits. Lastly, we used the simulation results to predict a location and timing for the development of weakness zones in the sedimentary stacks, as privileged areas for rock failure. The outcome underlines the influence of the basal tilt angle, with a slight tilt impacting the wedges stability to a similar extent as a substantial increase in sedimentation rate. Altogether, this study emphasizes the need for careful consideration of non-vertical stresses in basin simulations, including in passive tectonic contexts. It also suggests that the iterative coupling method employed is a promising way to match industrial needs in this regard.

Iterative coupling of BEM and FEM for nonlinear dynamic analyses

2004 ◽  
Vol 34 (1) ◽  
Author(s):  
D. Soares Jr ◽  
O. von Estorff ◽  
W. J. Mansur
Keyword(s):  
Nonlinear Dynamic ◽  
Iterative Coupling ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses

Wellbore Failure During Water-Alternating-Gas Injection by Use of Flow-Stress Coupling Method

SPE Journal ◽  
2016 ◽  
Vol 22 (01) ◽  
pp. 172-183 ◽  
Author(s):  
Mahmood Bataee ◽  
Sonny Irawan ◽  
Syahrir Ridha ◽  
Hamed Hematpour ◽  
Zakaria Hamdi
Keyword(s):  
Coupling Method ◽  
Injection Wells ◽  
Iterative Coupling ◽  
Water Alternating Gas ◽  
Porosity And Permeability ◽  
Volume Method ◽  
Pressure Changes ◽  
Wellbore Failure

Summary Accurate evaluation of failure pressure is crucial in the design of injection wells. Besides, in-situ stresses play an important role in obtaining the results. Pressure and rock stresses are related together as the role of effective-stress theorem. In fact, pressure changes with stress alteration caused by change in porosity and permeability. Therefore, it should be obtained with the coupling method. Moreover, to calculate pressure, temperature, and stress in the fully coupling method, a huge matrix should be solved, and it takes long processing time to implement it. Therefore, this study developed a wellbore geomechanical model for stability during injection by use of the iterative coupling method. The processing speed was enhanced in this study because the parameters were calculated separately. The parameters of pressure, temperature, saturation, and stress were obtained for the multiphase-flow condition with numerical modeling. Furthermore, in this study, the finite-difference method (FDM) had been used to solve pressure, temperature, and saturation, whereas the finite-volume method (FVM) was applied to solve the wellbore stress. On top of that, the iterative coupling method was used to improve the accuracy of the stress results. As a result, a correction of approximately 20 psi (0.14 MPa) was noted for pressure in relation to stress, which is 1 psi (6.89 kPa). Moreover, the Drucker-Prager failure criterion was used to model the fracturing on the basis of the stress results. Other than that, sensitivity analysis on horizontal maximum (σH) and minimum (σh) stresses showed that by increasing σH, the maximum injection pressures to avoid fracturing had been reduced, whereas in the case for σh, an increment was observed.

scholarly journals Large-Scale Fracture Mechanics Analysis Using Partitioned Iterative Coupling Algorithm

2012 ◽  
Vol 78 (791) ◽  
pp. 966-975 ◽  
Author(s):  
Yasunori YUSA ◽  
Shunji KATAOKA ◽  
Hiroshi KAWAI ◽  
Shinobu YOSHIMURA
Keyword(s):  
Fracture Mechanics ◽  
Large Scale ◽  
Iterative Coupling ◽  
Mechanics Analysis ◽  
Coupling Algorithm
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