Study On Key Technologies Of Dynamic Simulation For Virtual Nuclear Facilities Prototype

Virtual nuclear facilities prototype is a virtual simulation system which can be used to simulate the operating of the nuclear facilities and perform the various design scenarios and the dangerous experiment virtually. The virtual nuclear facilities prototype can solve the difficult of the core parts’ assembly design and the difficult of the evaluation to evolution process of the core accident. The reactor core components are complicate in motion and compact in internal space as well, thus lead to the complex motion behaviors. The real-time performance and accuracy of the collision detection will be required obviously. At the same time, physical fields in accident situations have the characteristics such as a variety of data source, high dimensions, large amount of data and so on. Therefore, the real-time performance and synchronicity of the rendering for the large-scale time-varying physical fields will be required. This thesis has deeply studied the key technologies of the dynamic simulation in virtual nuclear facilities prototype. The related research of the two technologies can improve the sense of reality in virtual prototype and they can also contribute to the feasible assembly design and evaluation to the evolution process of the core accident. Main innovations are as follows:(1) A kind of collision detection method which is coupling of block and ray query is proposed. The method involved creating multiple bounding boxes in the light of complex model. Bounding box collision detection was performed and got the approximate location of the collision zone. Then, ray query collision detection was performed and got the collision position at the precise level of triangles. It had avoided more triangles’ calculation in check of the ray query and ensured the accuracy in dynamic simulation. It had solved the contradiction problem between the real-time performance and the accuracy in collision detection and successfully achieved the precision simulation of the complex assembly scene. The proposed method can be benefit to the structural design of the complex nuclear facilities. The test result which was on behalf of the China LEAd-based Research Reactor CLEAR-I model estimated that the method had a thirty-fold better speed rate under the condition of the same precise level. It can also guide the structural design of the geometric models of nuclear facilities.(2) A real-time and dynamic rendering method for large-scale time-varying data field is developed. Particle system was used to simulate time-varying data fields. GPU-based asynchronous transmission method and data field’s continuous transmission strategy was used to implement real-time transmission for large-scale time-varying data field. Thus not only saved the GPU memory load, but also improved the transmission speed. CPU-based thread scheduling strategy was used to achieve the multivariate synchronous rendering. All the above methods were united to achieve the real-time rendering of the time-varying data field whose capacity had exceeded the system memory. The test result which was on behalf of the single pump estimated the average frame rate more than twenty four every second and met the real-time requirement in dynamic simulation. It can also display the change rule of the time-varying data field intuitively.(3) Based on the integrated system SuperMC/RVIS2.3, the simulation of the virtual refueling assembly and the evolution process of Loss of Heat Sink in the engineering applications for China Lead-based Research Reactor CLEAR-I are achieved and expected to assist the feasible structural refueling design and the objective evaluation to the evolution process of the core accident.