Thermal Performance and Flow Characteristics of Supercritical Hydrogen in Variable-Aspect-Ratio Regenerative Cooling Channels: A CFD Investigation. - Gibreel, Mohammednour; Jamea, Ali Mohammed Adam; Adam, Abdalazeem; Xiaohu, Chen; Elmouazen, Hisham; Wahballa, Hosham (Fluids, 2026)