Large-scale gas-liquid-solid coupled analysis with large deformation

2017 ◽  
Vol 2017.30 (0) ◽  
pp. 141
Author(s):  
Tatsuhiro SHONO ◽  
Gaku HASHIMOTO ◽  
Hiroshi OKUDA
Keyword(s):  
Large Deformation ◽  
Large Scale ◽  
Coupled Analysis

Numerical Simulations of Dynamic Fracture in Thin Pipes

2009 ◽  
Author(s):  
Y. Shie
Keyword(s):  
Numerical Simulations ◽  
Large Deformation ◽  
Dynamic Fracture ◽  
Thin Shell ◽  
Large Scale ◽  
Shell Structures ◽  
Theory Approach ◽  
Continuum Approach ◽  
Ill Conditioning ◽  
High Flexibility

We present a meshless methodology for large scale computations of fractureing thin shell structures subjected to internal pressure loads. The contribution is the first step of an efficient numerical methodology for such kind of events. In this paper, numerical simulations of large deformation dynamic fracture in thin shell structures using 3-D meshfree methods is presented. Due to the smoothness of the meshfree shape functions, they are well suited to simulate large deformation of thin shell structures while avoiding ill-conditioning as well as stiffening in numerical computations. The 3D meshfree representation allows high flexibility since thin structures as well as thick structures can be studied by the same methodology. The meshfree approach makes the methodology more flexible and independent as compared to finite elements, i.e. there is no need for creation of mesh. Dynamic fracture is modeled by a simple criterion, i.e. removing connectivity between adjacent nodes once a fracture criterion is met. The main advantage of such a 3-D meshfree continuum approach is its simplicity in both formulation and implementation as compared to shell theory approach, or degenerated continuum approach. Moreover, it is believed that the accuracy of the computation may increase because of using 3-D exact formulation.

Large Deformation Analysis and Experiments With Double Parallelogram Compliant Mechanisms

2018 ◽  
Author(s):  
Abhijit A. Tanksale ◽  
Prasanna S. Gandhi
Keyword(s):  
Large Deformation ◽  
High Precision ◽  
Large Deformations ◽  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Vertical Plane ◽  
Coupled Analysis ◽  
Deformation Analysis ◽  
Flexible Beams ◽  
Straight Line

Compliant mechanisms are highly preferred in applications demanding motion with high precision. These mechanisms provide friction-less, backlash-free precise motion obtained through deformation of flexible members. The double parallelogram compliant mechanism (DPCM) is one the most important compliant mechanisms to obtain highly precise straight-line motion. DPCM when operated in horizontal plane yield high precision straight-line motion (even with large deformations) useful in several engineering applications. However, constraints such as space, dead loads, etc. may demand DPCMs to be used in the vertical plane. For DPCMs operating in a vertical plane, the axial load due to gravity causes tension and compression in flexible beams which get coupled to bending under large deformations. This ultimately affects the parasitic error of straight-line motion. This paper presents a coupled analysis, along with experimental validation, of DPCM operating in vertical plane considering gravity effects with large deformation.

scholarly journals In- and ex-vessel coupled analysis of IVR-ERVC phenomenon for large scale PWR

2015 ◽  
Vol 80 ◽  
pp. 322-337 ◽  
Author(s):  
Yue Jin ◽  
Wei Xu ◽  
Xiaojing Liu ◽  
Xu Cheng
Keyword(s):  
Large Scale ◽  
Coupled Analysis

Numerical Modeling and Ocean Testing of a Direct-Drive Wave Energy Device Utilizing a Permanent Magnet Linear Generator for Power Take-Off

2009 ◽  
Author(s):  
David Elwood ◽  
Al Schacher ◽  
Ken Rhinefrank ◽  
Joe Prudell ◽  
Solomon Yim ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Large Scale ◽  
Intermediate Energy ◽  
Coupled Analysis ◽  
Analysis Tool ◽  
State University ◽  
Direct Drive ◽  
Test Bed ◽  
Modeling Approach

For the past several years an inter-disciplinary research group at Oregon State University (OSU), working in conjunction with Columbia Power Technologies (CPT) has been researching innovative direct-drive wave energy systems. These systems simplify the conversion of wave energy into electricity by eliminating intermediate energy conversion processes. In support of this research OSU and CPT have developed a hybrid numerical/physical modeling approach utilizing a large scale linear test bed (LTB), and a commercial coupled analysis tool. This paper will present an overview of this modeling approach and its application to the design of a 10kW prototype wave energy conversion system that was tested in the open ocean in the fall of 2008. The data gathered during ocean testing was used to calibrate the numerical model of the device and predict the energy capture potential of the system.

Study on spudcan reinstallation next to a footprint using large deformation finite element method

2020 ◽  
pp. 147509022096751
Author(s):  
Qilin Yin ◽  
Jinjin Zhai ◽  
Sheng Dong
Keyword(s):  
Finite Element ◽  
Shear Strength ◽  
Large Deformation ◽  
Penetration Depth ◽  
Practical Interest ◽  
Coupled Analysis ◽  
Centrifuge Tests ◽  
Offset Distance ◽  
Initial Penetration ◽  
Moment Load

Safety problems may occur to the jack-up rig when it is installed near the old footprint. In this study, three-dimensional large deformation finite element simulations using the Coupled Eulerian–Lagrangian (CEL) method have been carried out on the spudcan–footprint interaction problem. The correctness of the CEL method is verified through comparison with existing centrifuge tests. Uniform and non-uniform clays with different shear strength profiles encompassing the typical strength range of practical interest are considered as the subsea soil. The principle of thermo-mechanical coupled analysis is provided, after which this method is used to realize the updating of clay strength profiles in non-uniform clays. The influences of initial penetration depth, offset distance and shear strength profile on horizontal and moment loads are investigated. Distributions of soil load on the spudcan are presented, and their effect on the resulted inclined loads during spudcan reinstallation is analyzed. In both uniform and non-uniform clays, two peak values are obtained on the horizontal and moment load profiles during the reinstallation near the footprint. The relationship between the normalized maximum value of the horizontal load and initial penetration depth is described as a combination of linear and quadratic equations. While for the peak moment load, the offset distance is the main influencing factor. Finally, failure mechanisms of the surrounding soil during the penetration influenced by the footprint are discussed by defining four failure mechanism stages.

Modal Analysis and Design on the Base Plate of Large-Scale Linear Vibration Screen

2012 ◽  
Vol 155-156 ◽  
pp. 514-518 ◽  
Author(s):  
Xin Du
Keyword(s):  
Modal Analysis ◽  
Large Deformation ◽  
Fatigue Damage ◽  
Large Scale ◽  
Computer Software ◽  
Base Plate ◽  
Linear Vibration ◽  
Side Plate ◽  
Analysis And Design ◽  
Nature Frequency

Large-scale vibration screen produced modal deformation under the influence of their quality. They often leaded to destruction in the linear vibration screen. This damage often occurred in side plates and screen boxes. Because rivets connected the side plate, it was individually analyzed. There were large deformation of linear vibration screen ZX3175 by computer software COSMOSWorks. The nature frequency of the screen plate was close to the screen source. There were large modal deformations at the edge of the plate. This was the main reason for fatigue damage of the plate. This paper put forward some methods to reduce modal deformation of the base plate.

scholarly journals A scalable and modular Material Point Method for large-scale simulations

2019 ◽  
Author(s):  
Krishna Kumar ◽  
Jeffrey Salmond ◽  
Shyamini Kularathna ◽  
Christopher Wilkes ◽  
Ezra Yoanes Setiasabda ◽  
...  
Keyword(s):  
Large Deformation ◽  
Large Scale ◽  
Material Point Method ◽  
Material Point ◽  
Point Method ◽  
Background Mesh ◽  
Data Structures And Algorithms ◽  
Material Points ◽  
Large Scale Simulations ◽  
Large Deformation Problems

In this paper, we describe a new scalable and modular material point method (MPM) code developed for solving large-scale problems in continuum mechanics. The MPM is a hybrid Eulerian-Lagrangian approach, which uses both moving material points and computational nodes on a background mesh. The MPM has been successfully applied to solve large-deformation problems such as landslides, failure of slopes, concrete flows, etc. Solving these large-deformation problems result in the material points actively moving through the mesh. Developing an efficient parallelisation scheme for the MPM code requires dynamic load-balancing techniques for both the material points and the background mesh. This paper describes the data structures and algorithms employed to improve the performance and portability of the MPM code.

scholarly journals Numerical Studies on Two-Way Coupled Fluid Flow and Geomechanics in Hydrate Deposits

SPE Journal ◽  
2012 ◽  
Vol 17 (02) ◽  
pp. 485-501 ◽  
Author(s):  
J.. Kim ◽  
G.J.. J. Moridis ◽  
D.. Yang ◽  
J.. Rutqvist
Keyword(s):  
Fluid Flow ◽  
Gas Hydrate ◽  
Large Scale ◽  
Elliptic Boundary ◽  
Pressure Rise ◽  
Coupled Analysis ◽  
System Behavior ◽  
Coupled Flow ◽  
Porosity And Permeability ◽  
Hydrate Reservoirs

Summary Coupled flow and geomechanics play an important role in the analysis of gas-hydrate reservoirs under production. The stiffness of the rock skeleton and the deformation of the reservoir, as well as porosity and permeability, are directly influenced by (and interrelated with) changes in pressure and temperature and in fluid-(water and gas) and solid-(hydrate and ice) phase saturations. Fluid and solid phases may coexist, which, coupled with steep temperature and pressure gradients, result in strong nonlinearities in the coupled flow and mechanics processes, making the description of system behavior in dissociating hydrate deposits exceptionally complicated. In previous studies, the geological stability of hydrate-bearing sediments was investigated using one-way coupled analysis, in which the changes in fluid properties affect mechanics within the gas-hydrate reservoirs, but with no feedback from geomechanics to fluid flow. In this paper, we develop and test a rigorous twoway coupling between fluid flow and geomechanics, in which the solutions from mechanics are reflected in the solution of the flow problem through the adjustment of affected hydraulic properties. We employ the fixed-stress split method, which results in a convergent sequential implicit scheme. In this study of several hydrate-reservoir cases, we find noticeable differences between the results from one- and two-way couplings. The nature of the elliptic boundary value problem of quasistatic mechanics results in instantaneous compaction or dilation over the domain through loading from reservoir-fluid production. This induces a pressure rise or drop at early times (low-pressure diffusion), and consequently changes the effective stress instantaneously, possibly causing geological instability. Additionally, the pressure and temperature regime affects the various phase saturations, the rock stiffness, porosity, and permeability, thus affecting the fluid-flow regime. These changes are not captured accurately by the simpler one-way coupling. The tightly coupled sequential approach we propose provides a rigorous, twoway coupling model that captures the interrelationship between geomechanical and flow properties and processes, accurately describes the system behavior, and can be readily applied to large-scale problems of hydrate behavior in geologic media.

scholarly journals Large deformation coupled analysis of embedded pipeline – Soil lateral interaction

2021 ◽  
Vol 78 ◽  
pp. 102971
Author(s):  
Xiaoyu Dong ◽  
Wangcheng Zhang ◽  
Hodjat Shiri ◽  
Mark F. Randolph
Keyword(s):  
Large Deformation ◽  
Lateral Interaction ◽  
Coupled Analysis
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