Design Of Integrated Radiation Transport Simulation Modeling System For Multiple Codes

With the rapid development of the computer software and hardware, the nuclear and radiation numerical simulation methods and codes obtained the widespread and considerable development. The Computer Aided Design (CAD) based and medical images based automatic modeling techniques and software have been developed in recent years to speed up the modeling process significantly and use the complex models for nuclear and radiation transport analysis.However, the early automatic modeling tools were developed aiming at one specific simulation code. It is low expansible to support other simulation codes. Also, they have only a unitary function. Some of them only implemented the visualization of simulation model with providing an assistant graphical interface; others only provide a translation interface between CAD models or medical images and radiation transport simulation models. Therefore, it becomes the urgent needs to design and develop an integrated multi-functional automatic modeling software system with an advanced architecture in the field of nuclear and radiation transport analysis.In order to meet the new demand of automatic modeling, this thesis concluded the current status of existing automatic modeling techniques and tools for radiation transport codes at home and abroad and analysis their development trends. Then, this thesis designed an integrated multi-functional automatic modeling software system to support various simulation codes based on Monte Carlo method, discrete ordinates method and method of characteristics. The design included architecture design and functionality design. For the architecture design, the scientific workflow mechanism based system architecture and a self-defined extensible markup language (XML) based data interface method was proposed and designed. For the functionality design, four main functions of the integrated modeling system were detailed designed including geometric preprocess, geometric translation, calculation supervision and post-processing.On the basis of the self-developed CAD/Image-based Modeling Program for Nuclear and Radiation System (MCAM), two key technologies were studied including feature recognition based CAD model decomposition technique and similarity estimation based model reuse technique. These techniques effectively improved the existing automatic modeling algorithm in efficiency of modeling process and quality of modeling results.The design of integrated modeling system in this thesis would give an important reference direction for the future development of the automatic modeling methods and software for radiation transport simulation.