| Project/Area Number |
14540129
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General mathematics (including Probability theory/Statistical mathematics)
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| Research Institution | Kanazawa University (2003-2004)
Kumamoto University (2002) |
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Principal Investigator |
HATAUE Itaru Kanazawa University, Graduate School of Natural Science and Technology, Professor, 自然科学研究科, 教授 (50218476)
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| Co-Investigator(Kenkyū-buntansha) |
IMAI Hitoshi Tokushima University, Department of Applied Physics and Mathematics, Professor, 工学部, 教授 (80203298)
ZHANG Shao-Liang University of Tokyo, Department of Applied Physics, Associate professor, 工学系研究科, 助教授 (20252273)
IWASA Manabu Kanazawa University, Graduate School of Science and Technology, Associate professor, 自然科学研究科, 助教授 (30232648)
SAISHO Yasumasa Kanazawa University, Graduate School of Engineering, Associate professor, 工学研究科, 助教授 (70195973)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | iteration process / convergence speed / linear system / Infinite-Precision Numerical Simulation / Krylov-subspace / Multivariate Analysis / stochastic differential equation / ランダム項 / 確率差分方程式 / リアプノフ指数 / 流体シミュレーション / 移動境界問題 / 数値解の安定的構造 / 確率微分方程式 |
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| Research Abstract |
For the purpose of construction of noble schemes in which influence of errors are extremely removed, we did consideration about setting of the reasonable condition for convergence of numerical solutions in iterative steps in solving the linear systems and about speed-up of convergence. In addition, we applied them to the issues of real fluid calculation and the problem of traffic jam in order to analyze several factors which govern nonlinear phenomena. First, we analyzed the structure of dynamical systems which are produced by discretizing the nonlinear differential equations from several viewpoints such as numerical experiments, visualization of nonlinear structure of attractors and statistical consideration. Concretely, we clarified essential structure of numerical solutions in discrete dynamical system and proposed the criterion to judge reliability of solutions.
Next, we tried to discuss how structure of numerical solutions of a stochastic differential equation changes by the insertion of errors with the random style from the viewpoints of probabilistic approaches. Concretely, we tried to investigate the dependence of the structure of numerical solutions on insertion of random errors. As a fundamental study, the stochastic differential equation based on the deterministic logistic differential equation was considered and the relation between the size of noise and characteristics of obtained numerical solutions was discussed. Furthermore, we tried to discuss the dependence of the structure of numerical solutions of incompressible fluid equations on insertion of random errors in solving simultaneous equations.
Next, direct numerical simulation to an integral equation of the first kind was carried out by using IPNS(Infinite-Precision Numerical Simulation). Numerical results are very satisfactory in accuracy. Moreover, they also show some interesting facts. These numerical results show IPNS facilitates numerical analysis for such inverse problems.
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