Real-time Visualization System for Large-scale Calculation Using Distributed Network

在各个领域进行超大规模的数值计算变得非常重要。在这个研究项目中，我们从计算流体力学、计算结构分析、计算材料工程、船舶动力学仿真等多个领域进行了如此大规模的计算，其中一些是为了可视化而需要实时进行的。主要结论如下：1)开发了拥堵航道海上交通模拟器。并在该模拟器生成的虚拟海域中进行了船模试验。模拟器是虚拟海上交通流的服务器，也是模型船控制的服务器。船上的PC机用于发送和接收GPS位置数据、陀螺仪船舶运动数据以及对模型船的舵角和螺旋桨转速等命令。该系统是本项目的主要成果，充分利用了Internet和串口的分布式计算网络。2)开发了船舶倾覆仿真程序。对数学模型进行了修正，与船模试验结果进行了比较，得到了更准确的结果。此外，还开发了动画程序来演示船只将如何倾覆。这是一个很好的例子，说明了分布式计算必须获得更快的计算速度。该程序有助于直观地了解倾覆现象，并为船长提供实时模拟器，指导他们如何避免倾覆。3)对海上和陆地运输进行了生命周期评估。将其对环境的影响与海运和陆运进行了比较，发现海运的环境影响是卡车运输的四分之一。

It becomes of great importance to conduct very large-scale numerical calculation in various fields. It is generally said that the computation cost and time is nearly proportional to the square of the solution-space scale.In this research project, we have conducted such large-scale computation in various fields from computational hydrodynamics, computational structure analysis, computational material engineering, and simulation of ship dynamics, some of which are necessary to be conducted in real time for visualization. The following conclusions are drawn.1) Marine traffic simulator for congested waterways is developed. Further, model ship experiment was conducted in a virtual sea area produced by this simulator. The simulator was the server for the virtual marine traffic flow and for the control of the model ship. PCs on board are used to send and receive data such as GPS position data, Gyro ship motion data and command for the model ship such as rudder angle and propeller revolutions. This system is the main result of this project and distributed computation network is fully utilized using Internet and serial link.2) Simulation program for ship capsize was developed. Mathematical model was revised to get more accurate result compared with model ship experiments. Besides, animation program was also developed to show how the ship will capsize. It is very good example of necessity of distributed computing to get faster computation. The program may be useful to understand the capsize phenomena visually and to use as a real-time simulator for ship masters to teach them how to avoid capsizing.3) Life cycle assessment for marine and land transportation was conducted. The environmental effect was compared with marine and land transportation and it is found the effect of marine transportation is a fourth of that of trucks.