scholarly journals A Coupled Modeling Simulator for Near-Field Processes in Cement Engineered Barrier Systems for Radioactive Waste Disposal

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 767
Author(s):  
Steven J. Benbow ◽  
Daisuke Kawama ◽  
Hiroyasu Takase ◽  
Hiroyuki Shimizu ◽  
Chie Oda ◽  
...  
Keyword(s):  
Finite Element ◽  
Radioactive Waste ◽  
Waste Disposal ◽  
Near Field ◽  
Coupled Model ◽  
Element Model ◽  
Simulation Software ◽  
Radioactive Waste Disposal ◽  
Hydrogeological Model ◽  
Coupled Modeling

Details are presented of the development of a coupled modeling simulator for assessing the evolution in the near-field of a geological repository for radioactive waste disposal where concrete is used as a backfill. The simulator uses OpenMI, a standard for exchanging data between simulation software programs at run-time, to form a coupled chemical-mechanical-hydrogeological model of the system. The approach combines a tunnel scale stress analysis finite element model, a discrete element model for accurately modeling the patterns of emerging cracks in the concrete, and a finite element and finite volume model of the chemical processes and alteration in the porous matrix and cracks in the concrete, to produce a fully coupled model of the system. Combining existing detailed simulation software in this way with OpenMI has the benefit of not relying on simplifications that might be necessary to combine all of the modeled processes in a single piece of software.

Simulation Analysis of an Ambulance Carriage Interior Noise

2014 ◽  
Vol 535 ◽  
pp. 581-585
Author(s):  
Shi Ke Hou ◽  
Song Bai ◽  
Hao Jun Fan ◽  
Hui Ding ◽  
Yong Zhong Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Boundary Element ◽  
Simulation Analysis ◽  
Coupled Model ◽  
Element Model ◽  
Simulation Software ◽  
Vehicle Body ◽  
Field Point ◽  
Acoustic Contribution ◽  
Multi Body

Based on the theory of multi-body system dynamics, the analytical method of finite element and boundary element, the finite element model of vehicle body, the rigid-flexible coupled model of vehicle and the acoustic boundary element model of carriage were established by applying a variety of simulation software. Road roughness was simulated and the SPL of field point in carriage under the excitation was computed at the frequency range of 20-150Hz. Considering the size and the positive /negative nature of panels acoustic contribution at SPL peak of field point, damping treatments were taken on different combinations of panels to decrease multiple field points SPL peak and the optimal treatment was finally confirmed. The results showed that noise reduction measures can generally decrease the SPL peak around the crew.

General discussion

1986 ◽  
Vol 319 (1545) ◽  
pp. 189-189
Keyword(s):  
Radioactive Waste ◽  
Waste Disposal ◽  
Near Field ◽  
Radioactive Waste Disposal ◽  
Radiological Protection ◽  
Individual Dose

R. H. Flowers. We have seen during this meeting that near-field, tar-field and biosphere all represent effective barriers to limit the risk from radioactive waste disposal. It therefore seems that the operators of disposal sites will have no difficulty in meeting ICRP limits on individual dose. The principal concern will be with the understanding and application of ALARA in a practical way. Can Mr Webb, who gave us that very clear paper on radiological protection procedures, offer any advice to the industry on how to apply ALARA in practice?

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