Speaker
Description
Neutronics simulations in fusion facilities are done typically with Monte Carlo radiation transport tools like MCNP. While these tools use geometries based on Constructive Solid Geometry (CSG), fusion facilities are typically modelled as CAD models using the B-rep (boundary representation) system. The most successful approach to overcome this limitation is CAD model conversion into CSG models. In conversion tools, automatic void generation is one of the key features. Although engineering CAD tools are able to create the empty space that surrounds the CAD model, this approach is prohibitive for highly complex CAD models, like those of the ITER reactor, and therefore conversion tools have automatic void generation capabilities (García et al., 2021).
In this work it is presented, for GEOUNED conversion tool (Catalán et al., 2024), the parallelisation of the automatic void generation. Main design objectives were to achieve an optimal workload among several CPU cores and the progressive use of the parallel resources. Two parallel implementations were developed: block and progressive ones. Using a complex ITER CAD model, it was evaluated the GEOUNED computational parallel performance generating the void space. The two parallel implementations and a sequential one (without parallel capabilities) were evaluated. Finally, it was concluded that void space generation was faster with both parallel implementations compared with the sequential one, being the progressive parallel one the fastest. Also, the progressive parallel implementation achieved a better parallel workload distribution, a faster parallel data exchange and a progressive use of parallel resources.
Keywords: Conversion tools, Parallelisation, Automatic void generation, Particle Transport, Monte Carlo, CAD-based simulation
Acknowledgements: This work has been supported by UNED for the funding of the predoctoral contract (FPI). Also, this work has been made as part of the ETS Ingenieros Industriales-UNED doctoral program. The author also recognises Juan Pablo Catalán and Javier Sanz from UNED regarding the discussions about the development of the presented work.
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