"Development of Numerical Turbulence Simulation Library"

我们的研究小组使用了多个EWS系统，这些系统与东京大学的主网络系统以及我们研究所的主机系统相连。本研究的目的是在现有的计算机环境下设计湍流分析软件库，主要针对机械工程、建筑环境工程、等离子体工程和湍流模拟等领域的定常或非定常雷诺平均模型、大涡模拟（LES）和直接数值模拟（DNS）进行了计算机的开发和改造。结果，大约30个分析程序被选择用于数值流动模拟库。特别是大涡模拟在分离流动中的应用，以及在复杂几何条件下的旋流和分离流动的代数应力模型和各向异性k-ε模型的验证等方面取得了显著的进展。通过对分布式处理环境下的数值计算方法的研究、大涡模拟结果的数据库和图像处理技术的建立以及大涡模拟模型的检验，开展了大尺度分析的研究，并将研究成果公开展示，通过在会议上提交研究论文、在期刊上发表论文、向公众开放模拟图书馆、组织研讨会和撰写总结报告等方式，这些活动有助于促进数值流体模拟的合作联合研究，也为研究人员之间共享软件指明了方向。

Our research group utilizes several EWS systems, which are systematically connected with University of Tokyo main network system and also with the main frame computers in our institute. The objective of the research is to design the software library for turbulent flow analysis based on the present computer environment.Development and modification of computer have been conducted mainly for steady or unsteady Reynolds averaged model, large eddy, simulation(LES), and direct numerical simulation (DNS) in various fields such as mechanical engineering, architectural environmental engineering, plasma engineering and turbulence modeling. As a result, approximately thirty analysis programs are selected for the numerical flow simulation library. Significant progress has been achieved, particularly in application of LES to a separation flow, and in verification of algebraic stress model and anisotropic k-epsilon model for a swirl and a separation flows in a complicated geometry. In addition, reliability of the numerical simulation codes has been improved.Research on large size analysis was carried out by examining numerical algorithm in the distributed processing environment, constructing data base and picture processing technique using LES results, and examining LES model.On the other hand, another objective of the research, which is to present the research progress in public, has been done by presenting research papers at the conferences, publishing papers in the journals, opening simulation library to the public, organizing seminars, and writing summary reports. These activities contributed to promoting cooperative joint research for numerical fluid simulation and also indicated the direction for sharing software among researchers.