This Special Technology Session addresses critical industrial challenges around hydrogen deployment by bridging computational mechanics, measurements, and techno-economic reasoning. We invite contributions that quantify where hydrogen is technically and economically justified across heavy industry and transport, and that demonstrate validated models capable of guiding design and operations. Target topics include multiphysics modelling of electrolyzers and the operation of fuel cells; Hydrogen storage and transport; hydrogen effects on materials (embrittlement, fatigue, fracture); dispersion, combustion, and safety; as well as plant- and network-scale simulations integrating electricity markets and heat recovery. The session also emphasizes value network analysis across supply chains—linking component performance, reliability, and maintenance to system cost, lifecycle impacts, and its risks.