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Article type: Cover
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Published: September 15, 2006
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Article type: Appendix
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Published: September 15, 2006
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Article type: Appendix
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Published: September 15, 2006
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Article type: Appendix
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Published: September 15, 2006
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Article type: Index
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A1-A16
Published: September 15, 2006
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Li-Xia Sun, Li-Rong Wang, Guang-Hui Cen, Jia-Cai Wang, Ichiro Hagiwara
Article type: Article
Session ID: 2001
Published: September 15, 2006
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Peer-to-peer networks have recently become one of the hottest topics both in academic research and commercial applications. This paper presents development and current P2P network from aspects of architecture topology, discovery mechanism, developer platforms and application. Finally, challenges faced by P2P network are discussed.
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Tauseef Aized, Koji Takahashi, Ichiro Hagiwara
Article type: Article
Session ID: 2002
Published: September 15, 2006
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The objective of this study is to analyze a pull type multi-product, multi-stage, multi-line Flexible Manufacturing System whose resources are subject to planned and unplanned breakdowns. Hence, the process and routing flexibility in the material flow is developed to ensure the continual supply of the finished products. The machine resources are flexible in this system and are capable to produce more than one item. At each production/assembly station, the items produced/assembled are inspected for quality through automated inspection units to ensure the quality of the products. The system is modelled and analyzed through coloured Petri net methodology and some results are presented.
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Yanxue liang, Ichiro Hagiwara
Article type: Article
Session ID: 2003
Published: September 15, 2006
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In present paper, source identification using blind source separation is discussed. For acoustic signal, we generally measure it using microphones for further analysis. However, due to complexity of acoustic environment, some other acoustic sources always exist so that the pure target signal can not be obtained. Using proposed blind source separation method, not only waveform of all sources can be recovered, but also their Direction Of Arrival (DOA) are detected.
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Junichi SHINODA, Wenjie CHENG, ZHUOQI Wu, Hidetoshi OTSUBO, Ichiro HAG ...
Article type: Article
Session ID: 2004
Published: September 15, 2006
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In recent years, the technologies in the reverse engineering have become more and more important not only for the engineering field but also many other fields. In fact the reverse engineering is exploited for comparison of a trial product with CAD data in mechanical industry, retention of ruins and statues of Buddha as digital archives in archaeology, creation of order-made dresses in dress industry and so on. In this article, the technologies of the reconstruction from the point clouds, that is the technologies to generate triangular meshes on the surfaces of the target models, is presented. It can also eliminate some kind of noise which gives the serious influence on mesh generation. Finally some examples demonstrate the applicability of the proposed method.
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Ittetsu INUZUKA, Hideki FUJII, Shinobu YOSHIMURA
Article type: Article
Session ID: 2005
Published: September 15, 2006
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Driving simulators are frequently used in training, developments of cars, and so on. But, almost all of them can reproduce only predefined situations. In a field of traffic engineering, a variety of traffic simulators have been developed and used in many cases. In this study, we attempt to combine these two kinds of simulators. We can simulate many kinds of interaction of a car that user controls and other cars or pedestrians that move and act autonomously according of their own rules and preference. In this paper, we develop an interactive interface for a multi agent based traffic and environmental simulator MATES as traffic simulator. We examine this system's real-time performance.
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Teppei Terane, Hiroshi Uchida, Ichiro Hagiwara
Article type: Article
Session ID: 2006
Published: September 15, 2006
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Recently, co-design of the products is getting more important on the development site of the product. This situation is caused by the change of user's demand from the product performance to the functionarity. In this report, we optimize the vehicle door closing sound. It affects people's impression of the vehecle, so the door closing sound should be designed carefully with the consideration about targeted customers' preference. We use the psychoacoustic parameters as the objective function to express the large sound quality area, and optimize the door shape by changing the door design properly.
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Yoshinori TOICHI, Yoshifusa MATSUURA, Hajime TAKADA, Kei AOKI, Masaaki ...
Article type: Article
Session ID: 2007
Published: September 15, 2006
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This paper describes an evaluation method for the ease of an ingress motion into a car based on an evaluative structure. An ingress motion is composed of 3 basic motions. The first motion is putting the inner foot on the car floor, and the second is sitting. The last motion is putting the outer foot on the car floor. It is thought that the human evaluative structures are different and independent in each motion. In order to discuss the relation between the biomechanical characteristics and the evaluation, it is important to clarify the structures in each motion. So experiments are carried out by using a mock-up of real-size front passenger seat and with using a questionnaire survey as Kansei evaluation. Through the results of the experiments, it is found that there is the correlation between the car configuration and the evaluation. With using of this relation, the ease of ingress motion can be indicated by getting the information about car configuration and personal size.
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Tetsuko Kitaoka, Ichiro HAGIWARA
Article type: Article
Session ID: 2008
Published: September 15, 2006
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A lot of crimes can be prevented beforehand by this research. It has on the system of crime prevention is sensational because a general person can adequately do this diagnosis in a short time. The mechanism (the check on a potential criminal and following) is necessary and indispensable at the former stage to the crime to decrease the crime. An important judgment of the presence of the mental trouble however is made it reel in the entire specialist's diagnosis, and becomesthe fetter of the necessity of large time, and crime prevention ..drawing a conclusion.,. the wall "Human rights issue". This research is an expression judgment support device that doesn't rely on specialist's experience rule of the possibility that a potential criminal perpetrates a crime by a general person, and can evaluate it from the expression of the face based on psychology, criminology, and psychiatry.
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Toshio NAGASHIMA, Naoki MIURA
Article type: Article
Session ID: 2009
Published: September 15, 2006
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The X-FEM in conjunction with the level set method can be used to simplify the modeling of continua containing several cracks and hence perform effective stress analyses related to fracture mechanics. In this study, numerical procedures for elastic-plastic X-FEM analysis including selections of the near-tip enrichment functions are examined. As numerical examples, two-dimensional crack problems of elastic-plastic materials under plane strain condition are solved to evaluate the crack opening displacement and the J-integrals around the crack tip. Obtained results are compared with those obtained using conventional finite element analysis.
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Yasuhiro TERABARU, Toshio NAGASHIMA, Naoki MIURA
Article type: Article
Session ID: 2010
Published: September 15, 2006
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In this study, numerical procedures for thee-dimensional elastic-plastic X-FEM analysis including selections of the near-tip enrichment functions are examined. The utilized enrichment functions approximate the asymptotic displacement field near the crack tip obtained by the HRR solution. As a numerical example, a surface crack problem of elastic-plastic materials is solved to evaluate the crack opening displacement and the J-integrals along the crack front, which is evaluated using the domain integral method. Obtained results are compared with those obtained using conventional finite element analysis.
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Rong TIAN
Article type: Article
Session ID: 2011
Published: September 15, 2006
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Kenitirou KOGI, Seiya HAGIHARA, Takesi MATUMOTO, Mitsugu TODO, Ryuji N ...
Article type: Article
Session ID: 2012
Published: September 15, 2006
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In recent, many total arthroplasty have been performed to aging people. The artificial joints are not analyzed including the bone by the three dimensional finite element method in all. It is well-known the bone is remodeled by itself. It is important to analyze the artificial joint and the bone. This paper presents the three-dimensional finite element analyses of both artificial joint and bone. The stress distribution and the results of the bone remodeling are obtained from these analyses.
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Hitoshi MIYOSHI, Tetsuyuki HIROE
Article type: Article
Session ID: 2013
Published: September 15, 2006
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The SPH solver of the AUTODYN-3D was applied to the numerical simulation of shaped charges. The hypervelocity particles of SPH precisely represented the profiles of shaped charges, including the jet velocity, the velocity gradient and the elastic-plastic phase changes of the liner material. Using the calculated jet particles, the target penetration process was simulated. The results of the calculation were time-consuming and some parameters did not conform with the traditional theory of the penetration.
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Eiji ISHII, Toru ISHIKAWA, Yoshiyuki TANABE
Article type: Article
Session ID: 2014
Published: September 15, 2006
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Automobile engine fuel spray includes multi-scale free surfaces ; a liquid film forms at the outlet of the fuel injector, and then the liquid film breaks up into droplets. To simulate multi-scale free surfaces, we developed a hybrid particle/grid method where the free surfaces within a sub-grid region were simulated with the particle method, and other regions were simulated with the grid method. In the particle method, we used two particles for gas and liquid to simulate the interaction between them. We tested the new method on a dam-break problem, and the predicted configurations for the water column were consistent with measurements of Koshizuka and Oka. We then simulated the fuel spray near the outlet of an automobile engine fuel injector and found that our method correctly simulated the breakup of the liquid film.
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Kazuhiro SATO, Hiroshi SHIMOYAMA
Article type: Article
Session ID: 2015
Published: September 15, 2006
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A CFD simulation solver that uses a Meshfree method and eliminates complicated grid generation processes was developed. This method uses a moving least squares interpolation in order to improve the analysis accuracy of the virtual boundary method. It was applied to the numerical simulation of high Reynolds number flow around a two-dimensional circular cylinder and a three-dimensional automobile to verify the accuracy of the flow analysis. The simulation results show good agreement with results from wind tunnel experiments.
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Rio YOKOTA, Shinnosuke OBI
Article type: Article
Session ID: 2016
Published: September 15, 2006
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The wake of a bluff body is calculated using a 3-D Vortex Method and turbulence statistics are calculated from the results, which are then compared with measurements by Particle Image Velocimetry and a URANS calculation. It is shown that when compared to a 2-D Vortex Method calculation, which was previously performed by the authors, the results of the 3-D calculation is much closer to the PIV measurements and URANS calculation.
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Yuya YAMASHITA, Hiroshi OKADA, Yuzuru SAKAI, Yasuyoshi FUKUI
Article type: Article
Session ID: 2017
Published: September 15, 2006
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In this paper, the problem definition of and the numerical procedures of smoothed particle hydrodynamics (SPH) on the analysis of semi-solid forming process of Al-SiC functionally graded material (FGM). FGMs are know to have many advanced features such as the reduction of thermal stress, enhanced resistance to wear, etc. However, Al-SiC FGM which is manufactured by a centrifugal method is difficult to machine. Thus, a semi-solid forming as a near net shape process has been attempted. SPH is used to clarify the flow of melt containing solid phase as distributed particles.
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Seiichi KOSHIZUKA
Article type: Article
Session ID: 2018
Published: September 15, 2006
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MPS (Moving Particle Semi-implicit) method has been developed for solid and shell dynamics. Since the particle methods are expected to apply to large deformation and fracture, geometrical non-linearity is studied for the MPS methods. Quaternion is employed as the nonlinear rotation angle system. Finite rigid-body rotation can be removed from the deformation gradient tensor using the quaternion. Strain is defined using the right stretch tensor involving the first-order sensitivity. When the quaternion of each particle is implicitly calculated, Hamiltonian can be derived and energy conservation is achieved by employing symplectic schemes.
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Takayuki KOIZUMI, Nobutaka TSUJIUCHI, Jun MATSUMOTO
Article type: Article
Session ID: 2019
Published: September 15, 2006
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The Distinct Element Method (DEM) has been applied for the analysis of dynamic interactions between soil and vehicle. The DEM makes it possible to analyze the discrete behavior of soil. However, the cohesive property of soil should be considered additionally because the cohesion influences the soil behavior largely. In this study, the adhesive force caused by liquid bridge was applied to the DEM, and the wet soil model was constructed. To investigate the validity of the wet soil model, we conducted the simulation of bar penetration. The result of simulation is corresponding to the similar experiment in the soil deformation.
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Satoyuki TANAKA, Hiroshi OKADA
Article type: Article
Session ID: 2020
Published: September 15, 2006
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An adaptive B-spline wavelet Galerkin method is adopted to the solid and structural analyses. The B-spline scaling function and wavelets used as the basis functions have simple forms and are relatively easy to integrate and differentiate. The basis functions have the so called multiresolution properties. High gradient region of stresses and strains can be refined by the superposition of the different length scale basis functions. As the wavelet Galerkin method is discretized based on structured cells, there are no re-meshing processes for the refinement of the solution. Due to control the spatial resolution of the wavelet Galerkin solution based on the posteriori estimate of its discretization error, an adaptive analysis is adopted. In this paper, adaptive B-spline wavelet Galerkin analyses to the stress concentration problems are performed.
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Shinji SASAKI, Tatsuya YASUKOUCHI, Seiya HAGIHARA, Mitsuyoshi TSUNORI, ...
Article type: Article
Session ID: 2021
Published: September 15, 2006
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In the present paper, The error of numerical solutions of the element free Galerkin method (EFGM) is estimated to eveluate accuracy of the EFGM. A method of smoothing the distribution of nodes is applied to the relocation of all nodes in the domain of an analysis model. The nodal relocation method in which nodes are relocated using physical interbubble force called bubble meshing for the FEM is applied to the adaptive analysis. The node allocation after relocation have higher accuracy than the initial node allocation.
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Hideyuki SAKURAI
Article type: Article
Session ID: 2022
Published: September 15, 2006
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Moving least squares (MLS) are used as promising approximation in meshfree methods. However, known drawbacks of MLS, such as the accuracy sensitivity to the support size of the weight function and to the steep changes of the node distribution, have not yet been discussed sufficiently. In this paper, these problems are spotlighted from a standpoint of the improvement of the solution reliability and the computational efficiency on MLS. Two questions are submitted against the well-known advantages of MLS. A computational bottleneck of MLS, which is setting of the support size corresponding to the node distribution, is also presented concretely.
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Kazuo MATSUURA, Hiroshi KANAYAMA
Article type: Article
Session ID: 2023
Published: September 15, 2006
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Numerical simulations of hydrogen dispersion in a partially open space are performed in this paper. The transient behavior of hydrogen and the process of hydrogen accumulation in the space are discussed. Also, the effects of changing vent position on the distribution of hydrogen concentration are shown.
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Hiroshi Kanayama, Kazuo Matsuura, Yuya Tachikawa
Article type: Article
Session ID: 2024
Published: September 15, 2006
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A two-dimensional computational model of fuel cells has been developed by Yi and Nguyen in 1999. Here, we examine their model using the finite element method and a simple time difference scheme. Our numerical results are consistent with their results.
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Bunkou GO, Serban Georgescu, Hiroshi OKUDA
Article type: Article
Session ID: 2025
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Hydrogen, as a sustainable and clean energy, has become the center of public attention. The technology about hydrogen is developing fast every year. On the other hand, there are still many problems upon the practical use of hydrogen. In this paper, we propose the scenario of the diffusion of the fuel cellvehicle (FCV). In consideration of car makers, consumers and government, we built up a social network using multi-agent simulation and tried to figure out the guidelines for each agent in the network.
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Serban Georgescu, Hiroshi Okuda
Article type: Article
Session ID: 2026
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In the current study, we apply the MADS diffusion framework the the diffusion of fuel cell vehicles. We first define models for consumers, suppliers and their interactions. Then, combining historical data with technological forecasts, we compute the evolution of vehicle attributes. We then simulate the diffusion of FCVs and hybrids on six scenarios. We find agreement between our results and literature. Using MADS for designing the simulation proves to be very efficient.
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Toshihiko UMEKAGE, Masatomo KADOWAKI, Motoki HAMASAKI, Shinichi YUU
Article type: Article
Session ID: 2114
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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We have numerically simulated the particle and gas flows in the raceway region in a real blast furnace of which dimension is the same as that of Nippon Steel Co., Oita No.1 BF using Distinct Element Method for the computation of the multi body interaction among coke particles, Hard Sphere Model for two-body interaction of powder particles based on Direct Simulation of Monte-Carlo Method and Finite Difference Method for the numerical analysis of Navier-Stokes equations with the interaction terms between gas and particles for the gas flows. We have taken the existence of softening melting cohesive zones into account. In this study, we have examined the effects of tuyere angles on the flow stability in the raceway region. Calculated results indicate the raceway pattern, its fluctuations and its various periods. The results also indicate the velocity distributions of coke, powder and gas, and packing ratio distributions of these particles. The calculated data show that steady state raceway is formed at about seven degrees downward in the tuyere angle.
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Yusuke DOI, Akihiro NAKATANI
Article type: Article
Session ID: 2115
Published: September 15, 2006
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Localized structures in anharmonic lattice systems called intrinsic localized modes (ILMs) are investigated numerically. ILMs are time-periodic and spatial-localized structures due to nonlinearity and discreteness of anharmonic lattices systems. We find that two types of ILMs exist in two dimensional square lattice systems in terms of structures: quasi-one dimensional ILMs and two dimensional ones. Adding to this, we find ILMs envelope and internal frequency are highly depend on lattice structures and interaction potential. We also show that quasi-one dimensional ILMs can move with keeping their localized structures.
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Tadao FUKUTA, Yasuhiro AKAHOSHI, Yuki TAKAYAMA, Koichi OZAKI
Article type: Article
Session ID: 2116
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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At present, the demand to the improvement in the characteristic of steel material is expanded in the various directions with development of industrial technology, and investigation of the improvement is performed. We focus on precipitation hardening in strengthening mechanism of steel materials. In this study, we simulate an influence of copper precipitates on motion of an edge dislocation using Molecular Dynamics (MD) method in the iron-copper model alloys. In this paper, we compare the motion of the dislocation between copper precipitates of 3nm and 5nm, and discuss their difference.
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Hiroyasu Kondo, Tomoyasu Aihara
Article type: Article
Session ID: 2117
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Molecular dynamics computer simulation was performed for model polymer under heating and /or cooling condition. Crystalline polyethylene gives isotropic amorphous structure under T_g=226K. Plastic deformation processes under 300K, are simulation under tensile, compressive and shear stress condition Middle and long range correlation of the polyethylene structure materials processing engineering. In addition, about plastic deformation behavior of a macromolecule polymer single-phase alternating current, I assume that I clarify it and analyze the change of the economic structure a by-end of this study.
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Yukitaka YASUZAWA, Shoko TABUCHI
Article type: Article
Session ID: 2118
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Large ship structures are designed considering vibrations induced bypropeller or engine excitation, to prevent structural failure due to metal fatigue and to guarantee comfortable habitability. Vibration analysis of large complex structures such as ships needslarge-scale computation and much time for modeling, computation and post-processing. Therefore, parallel computing is expected to be applied for the ship vibration analysis. In the present study, the authors have developed parallel vibration analysis software by application of DDM based on CG method. As one of options for DDM analysis procedure, we have proposed a 'domain decomposition before mesh generation' and have showed the data structure. Moreover, the effect of pre-conditioning on the convergence is discussed.
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Gaku NAKAMURA, Yukiko KIMURA, Junji HORIGUCHI, Kohei YUGE
Article type: Article
Session ID: 2119
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In this study an axial compression test for a square FRP tube was conducted to observe the failure mode and a finite element analysis using LS-DYNA was also done to simulate it. To express the splay failure mode, the surface tiebreak method, where the layered shell elements are separated with a certain failure criterion, was employed as well as the constitutive equations based on the progressive damage model. The calculated deformation procedure is similar to the observed splay mode and the obtained load displacement curve was in good agreement with the experimental one.
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Yohei Tsuganezawa, Kaoru Kobayashi, Kohei Yuge
Article type: Article
Session ID: 2120
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In this paper a topology optimization algorithm of shell structure subject to crashing deformations is presented. As a topology optimization method the density method is used and the work done by the external loads is employed as the object function. In the density method the element density is taken as the design variable and material properties such as Young's modulus, the tangent modulus or the yield stress are assumed to be power functions of it. The bilinear shell element, which is widely used for the car crash analysis, is employed in the crash analysis with the explicit time integration scheme. The sensitivity analysis is conducted numerically using the history of nodal displacements and the density of the elements are updated with the optimality criteria method. Through several numerical examples it was shown that the present method is useful to design a shell structure.
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Hiroaki OSAKI, Kohei MUROTANI, Hitoshi MATSUBARA, Genki YAGAWA
Article type: Article
Session ID: 2121
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper describes the 3D complicated crack propagation analysis using the Fee Mesh Method (FMM). The computational fracture mechanics involves frequent re-meshing as the crack propagates. Therefore, the FMM is considered to be useful in the crack propagation analysis. In order to show the effectiveness of the FMM in crack propagation analysis, we study the 3D complicated crack propagation problems with the FMM.
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Shinsuke NAGAOKA, Masakazu INABA, Genki YAGAWA
Article type: Article
Session ID: 2122
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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In recent years, the performance of a computer has been improving by leaps and bounds. Numerical computation technology is developing greatly with improvement in the performance of a computer. On the other hand, the object for analysis becomes complicated and the meshing is more and more difficult. The Free Mesh Method which is one of the mesh-less methods is considered to make large-scale analysis more easier without the so-called meshing process. This paper describes the 3D animation system which is intended to be a post-processor for dynamic analysis with the free mesh method.
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Keiichi TSUJIMOTO, Hiroshi OKUDA, Joonhong AHN
Article type: Article
Session ID: 2123
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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An uncertainty analysis has been made by using the multiple-canister model, VR, for performance assessment for the high-level radioactive waste repository. However in the previous VR calculations, the number of connected canisters in the same water stream was determined arbitrary. In this study, the uncertainty resulting from fracture networks in host rock has been taken into account by applying the probability distribution function of the numbers of connected canisters by a fracture cluster obtained by the FFDF code. The release rate of ^<237>Np from a hypothetical repository model containing 100 canisters has been evaluated by using the VR code resulting from variations of the number of connected canisters.
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Kazuhiro HORIE, Yasukazu Nishi, Kazuto Nakagawa, Kazuyoshi Hoshino
Article type: Article
Session ID: 2124
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Poisonous substances such as dioxin exhausted in waste management have become a problem recently. This paper will examine the processing method that uses supercritical water as a solution. This processing method can resolve to water a safe inorganic substance of waste without exhausting the poisonous substance by using excellent supercritical water for resolution, however there is a problem of corrosion in the stored tank. This research aims to define the rules concerning corrosion by using cellular automata to bring the simulation result and the experiment result of metallic corrosion together to simulate with the tank, and to forecast the limit of usage.
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Masako IWATA, Kenji ONO, Tsuyoshi TAMAKI
Article type: Article
Session ID: 2125
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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This paper describes a simulation of octree AMR using Fully Threaded Tree with Pedigree (pFTT) data structure that is most suitable for adaptive mesh strategy among standard, FTT and pFTT data structures. To validate the present approach, a scalar transport equation was calculated on pFTT, using AMR with scalar gradient as an index for joining and splitting cells. According to numerical experiments, it was found that this method was able to capture a face of discontinuity appropriately. Skipping the process of joining and splitting, however, leads to the decline of the numerical accuracy and the increase of the calculation costs. Reasonably good results were obtained with every or every 2 steps joining and splitting on pFTT using AMR.
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Takeshi AKITA, Kyoichi NAKASHINO, M.C. NATORI
Article type: Article
Session ID: 2126
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A modeling of wrinkled membranes based on projection operator is presented within the classical membrane theory. The total strains in wrinkled membranes are decomposed into elastic and zero-strain energy parts. A projection matrix that extracts the elastic parts from the total strains is derived. The resulting modified elasticity matrix that represents the stress-strain relations in wrinkled membranes is thus obtained as product of the classical elasticity matrix and the projection matrix. A numerical example is presented to demonstrate the accuracy of the proposed method.
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Takayuki UTSUMI, Makoto ARAKI, Daisuke SAITOH
Article type: Article
Session ID: 2201
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Feng Xiao
Article type: Article
Session ID: 2202
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Being sophisticated numerical methods for CFD, both CIP/multi-moment finite volume method (CIP/MM FVM) and discontinuous Galerkin (DG) use more than one so-called moment in their formulations to increase the degrees of freedom on a local base. We compare the two in this paper in regard to underlying concept, moment definition and solution procedure.
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Yohsuke IMAI, Takayuki AOKI, Kenji TAKIZAWA
Article type: Article
Session ID: 2203
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A conservative form of Interpolated Differential Operator (IDO) scheme (IDO-CF) is presented for compressible and incompressible fluid dynamics. Fluid equations are solved for multi-moments those are volume integral, surface integral, line integral, and point value of conservative quantities. For Riemann problems of compressible fluid flow, the IDO-CF scheme gives the same or better results compared with Riemann solvers. Direct Numerical Simulation of incompressible turbulent flow shows that the proposed scheme has better resolution than that of non-conservative form of the IDO scheme.
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Satoshi II, Feng XIAO
Article type: Article
Session ID: 2204
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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We propose a high-order finite volume method based on multi-moment, namely constrained interpolation profile/multi-moment finite volume method (CIP/MM FVM), on the icosahedral spherical grid. In this method, two kinds of moments are defined as model variables on physical field, for example the point value (PV) and the volume-integrated average (VIA), and updated independently in time. Therefore, a CIP/MM FVM appears to be more attractive regarding the stability and flexibility in comparison with other conventional single-moment finite volume methods that use only the VIA as the model variable. The icosahedral spherical grid has a significant advantage of grid uniformity. We have developed a CIP/MM FVM formulations for the advection equation and the shallow-water equations on the sphere, and carried out some numerical experiments to varify the numerical schemes.
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Xingliang Li, Feng Xiao, Chungang Chen, Dehui Chen, Xueshun Shen
Article type: Article
Session ID: 2205
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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A conservative semi-Lagrangian transport scheme based on CIP/Multi-moment finite volume method has been developed on the Yin-Yang spherical grid. The underlying concept of the CIP/MM method used here is to treat two kinds of moments, namely the volume integrated average (VIA) and the point value (PV), as the prognostic variables different from those used in the conventional finite volume method. At the same time, the single-cell piecewise interpolation function over each mesh element is constructed in terms of both the VIA and the PV moments. In this paper, we present some numerical tests and verifications for implementing the CIP/MM finite volume method on the Yin-Yang grid.
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Satoi OGAWA, Takayuki AOKI
Article type: Article
Session ID: 2206
Published: September 15, 2006
Released on J-STAGE: August 01, 2017
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Overset-Grid Method is essential for simulation of moving boundary problem. In order to keep accurate interpolation at overlapping area, we adopt Interpolated Differential Operator scheme (IDO). That can solve Poisson equation with fourth-order accuracy. As the first step to simulate moving objects, we applied the method to the flow around stationary object.
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