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Hazama, Osamu; Nakajima, Norihiro; Post, P.*; Wolf, K.*
Proceedings of 8th US National Congress on Computational Mechanics (USNCCM-8) (CD-ROM), 1 Pages, 2005/07
Computational science has always played an import role in nuclear engineering because it is quite difficult, if not impossible, to carry out experiments on the actual full-scale reactors in operation. We have been developing a numerical simulation infrastructure for carrying out numerical experiments on the virtual reactors constructed within computers. In order to understand the physical behavior of a reactor, interactions among various physial phenomena must be considered and understood. Therefore, a generic coupler has been developed to connect various software and hardware for the purposes of coupled simulations. Since this type of simulation requires large amount of computational resources, the coupler development is carried out on the ITBL GRID infrastructure. The development of this coupler and its applications to parallel and distributed coupled simulations with future development plans are reported.
Hazama, Osamu; Nakajima, Norihiro
Keisan Kogaku Koenkai Rombunshu, 10(1), p.259 - 260, 2005/05
It is impossible to carry out a controlled laboratory experiments on an operational full-scale power plant. Therefore, construction of a testbed to assess the safety of such systems by numerical means is believed to be meaningful. At CCSE/JAERI, a project to develop a numerical testbed to assess the safety of nuclear reactors have been begun. Simulations of such complex systems will inevitably require tremendous amount of computational resources. Therefore, the numerical testbed is constructed on the ITBL Grid middleware. A prototype of a generic software coupling interface was developed to couple various simulation software within the ITBL Grid environment to execute large-scale multi-disciplinary simulations on the testbed. This coupler and its application to some fluid-structure problems will be illustrated.
Hazama, Osamu; Nakajima, Norihiro
Proceedings of 6th MpCCI User Forum, p.76 - 77, 2005/05
In order to accurately solve complex physical phenomena, interactions of various phenomena must be considered, which makes simulations multi-disciplinary. We have been developing a virtual nuclear reactor simulator on the ITBL Grid infrastructure in order to assess the safety of the nuclear reactors. This simulator system allows for numerical experiments on the full-scale and fully operational virtual nuclear reactors which is not possible in real-life experiments. In order to clarify various complex physical phenomena within the reactors, multi-disciplinary simulations, which are computationally demanding, are required. We have been developing a software to allow concurrent use of arbitrary combination of hardware and software to realize a multi-disciplinary simulation system on the ITBL. We have used STAMPI, developed by CCSE/JAERI, and MpCCI, developed by Fraunhofer SCAI, to construct the system. The system is now functional on the ITBL and will be introduced.
Hazama, Osamu; Guo, Z.*
Keisan Kogaku Koenkai Rombunshu, 9(2), p.617 - 620, 2004/05
Although multi-disciplinary coupled simulations are considered important and necessary by many to reflect reality into the numerical simulations, there still exist many obstacles which inhibit such numerical simulations. There still exist very few software packages in the market which satisfy user needs in such numerical simulations. In many instances, self-development of software packages which allow for such coupled simulations will also be quite burdensome simply because considering multi-physics require more knowledge, experience, time 
. Parallel processing of the simulations will definitely be required to aquire meaningful coupled solutions within a given practical time. Under the international collaborative efforts between CCSE/JAERI and Fraunhofer SCAI, a generic code coupling mechanism and implementation are developed for multi-disciplinary simulation of continua in a meta-computing environment. Two libraries, STAMPI, by CCSE/JAERI, and MpCCI, by Fraunhofer SCAI, will be implemented together to allow such simulations.
Hazama, Osamu; Guo, Z.
Proceedings of International Conference on Supercomputing in Nuclear Applications (SNA 2003) (CD-ROM), p.119 - 120, 2003/09
In order for the numerical simulations to reflect textquotedblleft real-worldtextquotedblright phenomena and occurrences, incorporation of multidisciplinary and multi-physics simulations considering various physical models and factors are becoming essential. However, there still exist many obstacles which inhibit such numerical simulations. For example, it is still difficult in many instances to develop satisfactory software packages which allow for such coupled simulations and such simulations will require more computational resources. A precise multi-physics simulation today will require parallel processing which again makes it a complicated process. Under the international cooperative efforts between CCSE/JAERI and Fraunhofer SCAI, a German institute, a library called the MpCCI, or Mesh-based Parallel Code Coupling Interface, has been implemented together with a library called STAMPI to couple two existing codes to develop an textquotedblleft integrated numerical simulation systemtextquotedblright intended for meta-computing environments.
Hazama, Osamu; Guo, Z.
Keisan Kogaku Koenkai Rombunshu, 8(2), p.759 - 760, 2003/05
no abstracts in English
Guo, Z.; Hirayama, Toshio; Matsuzawa, Teruo*; Watanabe, Masahiro*
Keisan Kogaku Koenkai Rombunshu, 7(1), p.173 - 176, 2002/05
no abstracts in English
Guo, Z.; Hirayama, Toshio; Matsuzawa, Teruo*
Application of High-Performance Computing in Engineering VII, p.125 - 134, 2002/00
The objective of the presented study is to develop a LC (Loose Coupling) simulation system implementing two commercial numerical simulation software packages linked by a library called MpCCI (Mesh-based paralle Code Coupling Interface). This library is an essential and a robust tool for carrying out interpolations of the physical variables (values) between different numerical models. We have programmed the MpCCI library into two commercial codes, Mecano and Star-CD, and implemented the developed LC simulation system on a distributed parallel computer by a MPMD (Multi Program Multi Data) parallel programming style. Numerical simulation results of an aneurysm diseased artery acquired by dynamic CSD (Computational Structure Dynamics) coupled transient CFD (Computational Fluid Dynamics) undergoing pulsation blood flow with the LC simulation system is presented which illustrate the mechanical behaviors of the arterial wall.
Guo, Z.; Onishi, Ryoichi*; Kimura, Toshiya*; Hirayama, Toshio
Proceedings of International Conference on Computational Engineering & Science (ICES 2001) (CD-ROM), 6 Pages, 2001/00
no abstracts in English