Parallel Analysis of Incompressible Flow and Structure Interaction Using Partitioned Iterative Method

2012 ◽  
Author(s):  
Shunji Kataoka ◽  
Hiroshi Kawai ◽  
Satsuki Minami ◽  
Shinobu Yoshimura
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Analysis Model ◽  
Iterative Coupling ◽  
Structure Interaction ◽  
Large Scale Analysis ◽  
Coupling Approach ◽  
Analysis System ◽  
Partitioned Method ◽  
Partitioned Methods

Dynamic response considering fluid structure interaction (FSI) is crucial in many engineering fields and the numerical methods to solve the FSI problems are keenly demanded in engineering field. Generally coupled phenomena can be simulated in either monolithic or partitioned methods, however the application of FSI analysis are limited because of its calculation costs. The partitioned method is now focused because it can re-use the existing flow and structural analysis solver without elaborated modification and it gives the same accuracy when iterative coupling approach is taken. When the partitioned method combined with the existing flow and structure solver which can solve large-scale analysis model, it is expected to solve realistic three dimensional complex FSI problems in acceptable durations. In this work, the partitioned FSI analysis system are developed using existing flow and structure solvers. The system is applied to several validation models and accuracy and efficiency of the solver are shown.

A Three-Dimensional Pedestrian–Structure Interaction Model for General Applications

2018 ◽  
Vol 18 (09) ◽  
pp. 1850107 ◽  
Author(s):  
Yan-An Gao ◽  
Qing-Shan Yang ◽  
Yun Dong
Keyword(s):  
Large Scale ◽  
Damping Ratio ◽  
Three Dimensional ◽  
Interaction Model ◽  
Dynamic Interaction ◽  
Structure Interaction ◽  
Numerical Studies ◽  
Structure Dynamic ◽  
Proposed Model ◽  
Reaction Forces

A three-dimensional (3D) pedestrian–structure interaction (PSI) system based on the biomechanical bipedal model is presented for general applications. The pedestrian is modeled by a bipedal mobile system with one lump mass and two compliant legs, which comprise damping and spring elements. The continuous gaits of the pedestrian are maintained by a self-driven walking kinetic energy, which is a new driven mechanism for the mobile unit. This self-driven mechanism enables the pedestrian to operate at a varying total energy level, as an important component for further modeling of the crowd-structure dynamic interaction. Numerical studies show that the pedestrian walking on the structure leads to a reduction in the natural frequency, but an increase in the damping ratio of the structure. This model can also reproduce the reaction forces between the feet and structure, similar to those measured in the field. In addition, the proposed model can well describe the 3D pedestrian–structure dynamic interaction. It is recommended for use in further study of more complicated scenarios such as the dynamic interaction between a large scale kinetic crowd and slender footbridge.

scholarly journals Large-scale comparative visualisation of sets of multidimensional data

2016 ◽  
Vol 2 ◽  
pp. e88 ◽  
Author(s):  
Dany Vohl ◽  
David G. Barnes ◽  
Christopher J. Fluke ◽  
Govinda Poudel ◽  
Nellie Georgiou-Karistianis ◽  
...  
Keyword(s):  
High Resolution ◽  
Physical Environment ◽  
Large Scale ◽  
Three Dimensional ◽  
Research Process ◽  
Multidimensional Data ◽  
Discovery Process ◽  
System 2 ◽  
Analysis System ◽  
High Level

We presentencube—a qualitative, quantitative and comparative visualisation and analysis system, with application to high-resolution, immersive three-dimensional environments and desktop displays.encubeextends previous comparative visualisation systems by considering: (1) the integration of comparative visualisation and analysis into a unified system; (2) the documentation of the discovery process; and (3) an approach that enables scientists to continue the research process once back at their desktop. Our solution enables tablets, smartphones or laptops to be used as interaction units for manipulating, organising, and querying data. We highlight the modularity ofencube, allowing additional functionalities to be included as required. Additionally, our approach supports a high level of collaboration within the physical environment. We show how our implementation ofencubeoperates in a large-scale, hybrid visualisation and supercomputing environment using the CAVE2 at Monash University, and on a local desktop, making it a versatile solution. We discuss how our approach can help accelerate the discovery rate in a variety of research scenarios.

Development of the Next-Generation Computational Fracture Mechanics Simulator on the Earth Simulator 2

2012 ◽  
Author(s):  
Kaworu Yodo ◽  
Hiroshi Kawai ◽  
Hiroshi Okada ◽  
Masao Ogino ◽  
Ryuji Shioya
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Large Scale ◽  
Three Dimensional ◽  
Intensity Factors ◽  
Element Analysis ◽  
Mechanics Analysis ◽  
Analysis System

Fracture mechanics analysis using the finite element method has been one of the key methodologies to evaluate structural integrity for aging infrastructures such as aircraft, ship, power plants, etc. However, three-dimensional crack analyses for structures with highly complex three-dimensional shapes have not widely been used, because of many technical difficulties such as the lack of enough computational power. The authors have been developing a fracture mechanics analysis system that can deal with arbitrary shaped cracks in three-dimensional structures. The system consists of mesh generation software, a finite element analysis program and a fracture mechanics module. In our system, a Virtual Crack Closure-Integral Method (VCCM) for the quadratic tetrahedral finite elements is adopted to evaluate the stress intensity factors. This system can perform the three-dimensional fracture analyses. Fatigue and SCC crack propagation analyses with more than one cracks of arbitrary complicated shapes and orientations. The rate and direction of crack propagation are predicted by using appropriate formulae based on the stress intensity factors. When the fracture mechanics analysis system is applied to the complex shaped aging structures with the cracks which are modeled explicitly, the size of finite element analysis tends to be very large. Therefore, a large scale parallel structural analysis code is required. We also have been developing an open-source CAE system, ADVENTURE. It is based on the hierarchical domain decomposition method (HDDM) with the balancing domain decomposition (BDD) pre-conditioner. A general-purpose parallel structural analysis solver, ADVENTURE_Solid is one of the solver modules of the ADVENTURE system. In this paper, we combined VCCM for the tetrahedral finite element with ADVENTURE system and large-scale fracture analyses are fully automated. They are performed using the massively parallel super computer ES2 (Earth Simulator 2) which is owned and run by JAMSTEC (Japan Agency for Marine-Earth Science and Technology).

Automated FE Analysis for Heat Sink of LED Modules

2013 ◽  
Vol 302 ◽  
pp. 765-771 ◽  
Author(s):  
Joon Seong Lee ◽  
Dong Keun Park ◽  
Youn Jong Choi
Keyword(s):  
Heat Sink ◽  
Geometric Model ◽  
Three Dimensional ◽  
Fe Analysis ◽  
Present System ◽  
Analysis Model ◽  
Solid Geometry ◽  
Analysis System ◽  
Definition Of ◽  
Interactive Operations

This paper describes an automatic finite element (FE) mesh generation for FE analysis of LED modules. It is consisting of element generation, bubble packing and solid geometry modeler. This automated FE analysis system including bubble packing method consists of three sub-processes: (a) definition of geometric model, i.e. analysis model, (b) generation of bubbles, and (c) generation of elements. One of commercial solid modelers is employed for three-dimensional solid structures. Bubble is generated if its distance from existing bubble points is similar to the bubble spacing function at the point. The Delaunay method is introduced as a basic tool for element generation. The developed system allows designers to evaluate detailed physical behaviors of structures through some simple interactive operations to their geometry models. To demonstrate practical performances of the present system, the system was used to an analysis of heat sink. Practical performances of the present system are demonstrated through several examples for heat sink of LED modules.

Large scale three-dimensional seepage analysis model test and numerical simulation research on undersea tunnel

2016 ◽  
Vol 59 ◽  
pp. 510-520 ◽  
Author(s):  
Shu-cai Li ◽  
Hong-liang Liu ◽  
Li-ping Li ◽  
Qian-qing Zhang ◽  
Kai Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Large Scale ◽  
Three Dimensional ◽  
Analysis Model ◽  
Seepage Analysis ◽  
Simulation Research

scholarly journals Constraining a 3DVAR Radar Data Assimilation System with Large-Scale Analysis to Improve Short-Range Precipitation Forecasts

2016 ◽  
Vol 55 (3) ◽  
pp. 673-690 ◽  
Author(s):  
Eder Paulo Vendrasco ◽  
Juanzhen Sun ◽  
Dirceu Luis Herdies ◽  
Carlos Frederico de Angelis
Keyword(s):  
Data Assimilation ◽  
Short Range ◽  
Large Scale ◽  
Three Dimensional ◽  
Radar Data ◽  
Scale Analysis ◽  
Large Scale Analysis ◽  
Assimilation Process ◽  
The Cost ◽  
Radar Data Assimilation

AbstractIt is known from previous studies that radar data assimilation can improve short-range forecasts of precipitation, mainly when radial wind and reflectivity are available. However, from the authors’ experience radar data assimilation, when using the three-dimensional variational data assimilation (3DVAR) technique, can produce spurious precipitation results and large errors in the position and amount of precipitation. One possible reason for the problem is attributed to the lack of proper balance in the dynamical and microphysical fields. This work attempts to minimize this problem by adding a large-scale analysis constraint in the cost function. The large-scale analysis constraint is defined by the departure of the high-resolution 3DVAR analysis from a coarser-resolution large-scale analysis. It is found that this constraint is able to guide the assimilation process in such a way that the final result still maintains the large-scale pattern, while adding the convective characteristics where radar data are available. As a result, the 3DVAR analysis with the constraint is more accurate when verified against an independent dataset. The performance of this new constraint on improving precipitation forecasts is tested using six convective cases and verified against radar-derived precipitation by employing four skill indices. All of the skill indices show improved forecasts when using the methodology presented in this paper.

scholarly journals Nonlinear analysis of multilayer composite pipes

2019 ◽  
Author(s):  
DC Pham
Keyword(s):  
Composite Structures ◽  
Large Scale ◽  
Global Analysis ◽  
Three Dimensional ◽  
Axial Loading ◽  
Large Scale Analysis ◽  
External Pressures ◽  
Highly Nonlinear ◽  
Composite Pipe ◽  
Composite Pipes

The use of composite materials has constantly increased in aerospace and offshore applications. One of typical composite structures for offshore application is multilayer unbonded composite pipe. The composite pipe comprised of several layers such as helically wound steel layers and polymeric layers, among which the helically wound steel wires play essential roles in providing axial and flexural stiffnesses of the pipe. Because of the geometric nonlinearity of each layer of the composite pipe and the flexibility in motion of individual layers against their adjacent layers, analyses of the composite pipe are highly nonlinear and computationally challenging. In this study, detailed three-dimensional Representative Volume Element models of the multilayer unbonded composite pipe are developed, and nonlinear analyses of the composite pipe are performed. The developed FE models effectively predict nonlinear responses of the pipe including slipping effects of steel layers under application of axial loading, bending, internal and external pressures. Based on the predicted results, a constitutive model of the pipe under various loadings is obtained which can be employed in the large scale analysis of the composite pipe to improve the accurate and computational efficiency of the global analysis.

Large Scale Dynamic Response Analysis of Rod Bundles in Fluid Using Partitioned Coupling Technique

2011 ◽  
Author(s):  
Shunji Kataoka ◽  
Satsuki Minami ◽  
Hiroshi Kawai ◽  
Shinobu Yoshimura
Keyword(s):  
Degrees Of Freedom ◽  
Large Scale ◽  
Three Dimensional ◽  
Dynamic Responses ◽  
Coupled Analysis ◽  
Response Analysis ◽  
Dynamic Interactions ◽  
Coupling Technique ◽  
Structure Interaction ◽  
Preconditioned Iterative

Dynamic responses considering fluid structure interaction (FSI) is important in many engineering fields and some of the FSI phenomena are treated as an acoustic fluid and structure interaction (AFSI) problem. The dynamic interactions between the fluid and structure can change dynamic characteristics of structures and their responses to external excitation such as seismic loading. The authors have developed a coupled simulation system for the large scale AFSI problems using an iterative partitioned coupling technique. In the system, the authors employed ADVENTURE system which adopted an efficient preconditioned iterative linear algebraic solver, and ADVENTURE Coupler is used to handle interface variable efficiently on various parallel computational environments. The authors employ Broyden method for updating interface accelerations to obtain the robust and fast convergence property of fixed point iterations. This paper presents the overview of the coupled analysis system and the results of its application to several AFSI problems are shown. The system runs efficiently in a parallel environment and it is capable for analyses of complex shaped three dimensional structures with more than 20 million degrees of freedom model.

Numerical Simulation of Fluid-Structure Interaction for Tension Membrane Structures

2012 ◽  
Vol 457-458 ◽  
pp. 1062-1065
Author(s):  
Xiang Yang Zhou ◽  
Qi Lin Zhang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Fluid Structure Interaction ◽  
Nonlinear Problems ◽  
Membrane Structures ◽  
Iterative Coupling ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Coupling Approach ◽  
Coupling Algorithm

Comprehensive studies on effect of fluid-structure interaction and dynamic response for tension structure were conducted by the numerical simulation. An iterative coupling approach for time-dependent fluid-structure interactions is applied to tension membranous structures with large displacements. The coupling method connects a flow-condition-based interpolation element for incompressible fluids with a finite element for geometrically nonlinear problems. A membranous roof with saddle shape exposed to fluctuating wind field at atmosphere boundary layer was investigated for the coupling algorithm. The dynamic response and the fluctuating pressure on member structure were calculated according to the coupling configuration.

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