Practical CAD-Centric Modeling of Transport Phenomena in Liquid Breeder Blankets

Numerous advances have been made in recent times in computer modeling of phenomena such as neutron transport, MHD, heat and mass transfer in complex geometries of importance to liquid breeder blanket modules. Modeling approaches over the years have not only involved high performance computing, but also modern CAD-based techniques, and an array of computer models ranging from ideal cycle analysis to 3D flow solvers. This has been particularly true in MHD and mass transfer simulations, and each of these approaches has met with a fair measure of success in limited sets of applications. We propose here a systematic sequence of advancements wherein a hierarchy of models is identified, integrated in a comprehensive software management system, and formal validation procedures are developed and performed. We expect that this will be of immediate interest to researchers in fusion nuclear science and technology (FNST). A framework for CAD-centric modeling for blanket modules was recently developed at HyPerComp in collaboration with TEXCEL. We are currently also developing advanced simulation tools for mass transport phenomena. We propose here to evolve a procedure for combining numerical and semi-numerical approaches for modeling MHD, heat and mass transport. Faced with the large computational expense in high-end solvers, the uncertainties in the physical models used in detailed mass transport studies, and the need to model the complete flow circuits (including blanket, manifold system, heat exchanger/steam generator, etc.), a hybrid simulation procedure seems to suggest itself as a valuable resource. These will include the coupling of codes which perform simplified modeling such as fully developed flow, quasi one-dimensional flow, reactor analysis using lumped flow elements, as well as detailed CFD. An effective graphical user interface will drive the simulation and exchange data across these models. Formal validation procedures will be developed in parallel. Commercial applications and other benefits: Proper evaluation of transport processes in liquid metal MHD flows, including Tritium permeation, MHD pressure drop, corrosion and transport of corrosion products, including their deposition in the cold section of the liquid metal loop is vital to the design of breeding fusion blankets, their safety and reactor economic feasibility