Prometech Software Inc.

Bunkyo-ku, Japan

Prometech Software Inc.

Bunkyo-ku, Japan

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Okukubo K.,Toppan Printing Co. | Yagi K.,Toppan Printing Co. | Yoshino K.,Toppan Printing Co. | Watanabe T.,Toppan Printing Co. | And 4 more authors.
ACM SIGGRAPH 2012 Posters, SIGGRAPH'12 | Year: 2012

ViewPaint is a viewing system for paintings. This system was produced to propose a new exhibition method using digital technology to art museums. In developing this system, we have tried to realize the idea that if viewers can explore a painting converted into a three-dimensional space, it is possible to foster understanding and imagination, with viewers considering why artists chose certain compositions, what motifs are depicted, and what the background to the period was. © 2012 ACM.


Murotani K.,University of Tokyo | Oochi M.,University of Tokyo | Fujisawa T.,Prometech Software Inc. | Koshizuka S.,University of Tokyo | Yoshimura S.,University of Tokyo
Transactions of the Japan Society for Computational Engineering and Science | Year: 2012

In this research, a new distributed memory parallel algorithm of the explicit MPS (Moving Particle Simulation) method is presented. The analysis region is divided for a distributed memory parallel computation using ParMETIS. Two communication techniques of an overlapping method and a non-overlapping method are estimated by parallel scalability tests. Since we find that load balance is most important for the distributed memory parallel algorithm of the explicit MPS method, we find that the non-overlapping method is more effective than the overlapping method. As a result, we have been able to do the MPS analysis of 268 million particles in 38 seconds per one time step. Performance during large scale simulation is examined by computing tsunami wave run-up on a virtual gulf area using up to 58 million particles. © 2012 by the Japan Society for Computational Engineering and Science.


Shibata K.,University of Tokyo | Koshizuka S.,University of Tokyo | Masaie I.,Prometech Software Inc.
Computer Methods in Applied Mechanics and Engineering | Year: 2016

We developed an ellipsoidal particle model to reduce the number of particles and the computational costs of the moving particle semi-implicit (MPS) method. A coordinate transformation was conducted to treat ellipsoidal particles in the same manner as sphere particles. The model for the MPS method's Laplacian operator was extended for use with ellipsoidal particles. The developed method is effective in cases where the rate of change of a physical quantity or shape in any given direction is smaller than that in other directions, and the authors have applied it to dam breaking problems in both two and three dimensions. As a result, the developed method's ability to reduce the required number of particles and the computational costs of particle simulations has been confirmed. The developed ellipsoidal particle model was also applied to smoothed particle hydrodynamics. © 2016.


Arai J.,University of Tokyo | Koshizuka S.,University of Tokyo | Murozono K.,Prometech Software Inc.
International Journal for Numerical Methods in Fluids | Year: 2013

A turbulent channel flow and the flow around a cubic obstacle are calculated by the moving particle semi-implicit method with the subparticle-scale turbulent model and a wall model, which is based on the zero equation RANS (Reynolds Averaged Navier-Stokes). The wall model is useful in practical problems that often involve high Reynolds numbers and wall turbulence, because it is difficult to keep high resolution in the near-wall region in particle simulation. A turbulent channel flow is calculated by the present method to validate our wall model. The mean velocity distribution agrees with the log-law velocity profile near the wall. Statistical values are also the same order and tendency as experimental results with emulating viscous layer by the wall model. We also investigated the influence of numerical oscillations on turbulence analysis in using the moving particle semi-implicit method. Finally, the turbulent flow around a cubic obstacle is calculated by the present method to demonstrate capability of calculating practical turbulent flows. Three characteristic eddies appear in front of, over, and in the back of the cube both in our calculation and the experimental result that was obtained by Martinuzzi and Tropea. Mean velocity and turbulent intensity profiles are predicted in the same order and have similar tendency as the experimental result. © 2012 John Wiley & Sons, Ltd.


Yamada Y.,University of Tokyo | Yamada Y.,Japan Society for the Promotion of Science | Sakai M.,University of Tokyo | Mizutani S.,University of Tokyo | And 3 more authors.
Transactions of the Atomic Energy Society of Japan | Year: 2011

In nuclear engineering, fluid flows involving free surface were well studied, e.g., pipe thinning produced by liquid droplet impingement, and steam explosion triggered by molten metal immersed in water. The moving particle simulation (MPS) method was often used in past studies. In this method, the Poisson equation was solved to obtain the pressure field. Solving the Poisson equation becomes a dominant process. Reducing the time of calculation of the Poisson equation is important for using the CFD in the engineering fields. Thereat, we propose a new MPS method by which the pressure field is calculated explicitly. We call it the explicit (E-)MPS method. The E-MPS method was applied to a static water and dam break problem to show its adequacy. Besides, we compare the calculation time between the E-MPS method and traditional one. © 2011 Atomic Energy Society of Japan, All Rights Reserved.


Ui A.,Japan Nuclear Energy Safety Organization | Ebata S.,Japan Nuclear Energy Safety Organization | Kasahara F.,Japan Nuclear Energy Safety Organization | Iribe T.,Prometech Software Inc. | And 2 more authors.
Journal of Nuclear Science and Technology | Year: 2010

It has been a concern that sump screen clogging would occur in pressurized water reactors (PWRs) in the case of a loss-of-coolant accident (LOCA), because two-phase jet flow would strip off thermal insulation from the piping and wash down the broken and fragmented debris to sump screens. It is necessary for the evaluation of the effectiveness of sump screens to estimate the amount of transported debris from a break position to sumps. In general, conservative logic trees have been used to determine debris transport rates. Realistic debris transport evaluation is useful for considering measures and rational decision making in licensing. The purpose of this study is to develop a debris transport evaluation model and to apply the model to this issue. We developed a solid-liquid multiphase model that is capable of simulating debris transport, settling, and resuspension. The model is able to treat solid particles of different sizes, which are smaller than uniform-sized liquid particles. This approach contributes to reducing the calculation cost in a large-scale simulation. The model and a turbulence model were implemented into a code based on the moving particle semi-implicit (MPS) method. Several open-channel hydraulic experiments with fibrous debris were conducted. The code named SANSUI 2.0 was validated by the comparison of the analytical results with experiments. This method was applied to the debris transport analysis of a full-scale PWR containment vessel floor, and the debris transport behavior was evaluated. © Atomic Energy Society of Japan.


Iribe T.,University of Ryukyus | Fujisawa T.,Prometech Software Inc. | Koshizuka S.,University of Tokyo
Coastal Engineering Journal | Year: 2010

Methods for reduction in communication time during parallel computation of a particle method for flow simulation of seaside areas are presented. Since the analysis region was divided for parallel computation using a PC cluster, communications among processors were necessary. Two techniques were tested. The first was renumbering, which reduced the amount of communication. The second was the use of a communication list including the maximum and minimum particle numbers. These techniques improved communication speed. Performance during large-scale simulation was examined by computing tsunami wave run-up on a seaside area using 6,300,000 particles. A calculation time of 237 hr was used to generate real time data for 60 s. © 2010 World Scientific Publishing Company and Japan Society of Civil Engineers.


Hanada Y.,Prometech Software Inc. | Kitaoka S.,Prometech Software Inc. | Ye X.,Sentan Digital Co.
Procedia Engineering | Year: 2013

We optimized Moving Particle Simulation (MPS) method for Kepler GPU. Solving sparse matrix occupies a large portion of particle simulation because it is a casus of performance bottlenecks. We reported at NVIDIA's GPU Technology Conference 2012 that we achieved to accelerate MPS method about 7x faster on NVIDIA Tesla C2070 compared with on Intel Core i7 920 (4 cores). Last year, NVIDIA released the latest GPU, Kepler. We optimized and accelerated particle simulation on Kepler GPU by using new shuffle instruction and read-only data cache. We obtained to accelerate Sparse Matrix-Vector multiplication operation 1.48x faster on Kepler (Tesla K20c) compared with on Fermi (Tesla C2075). © 2013 The Authors.


Trademark
Prometech Software Inc. | Date: 2015-07-17

Telecommunication machines and apparatus; electronic machines, apparatus and their parts; electronic circuits, CD-ROMs and DVDs recorded with computer programs; electronic publications, downloadable; magnetic or optical data carriers recorded with video or music; downloadable computer programs, image files or music files via Internet and mobile phone network. Computer programming; technological advice relating to computers, automobiles and industrial machines; rental of computers; providing computer programs on data networks.


Trademark
Prometech Software Inc. | Date: 2016-11-18

Telecommunication machines and apparatus; electronic machines, apparatus and their parts; electronic circuits, CD-ROMs and DVDs recorded with computer programs; electronic publications, downloadable; magnetic or optical data carriers recorded with video or music; downloadable computer programs, image files or music files via Internet and mobile phone network. Computer programming; technological advice relating to computers, automobiles and industrial machines; rental of computers; providing computer programs on data networks.

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