Unsteady nonlinear coupled constitutive relations model based on the PHengLEI framework. - Junyuan, Yang; Shuhua, Zeng; Wenwen, Zhao; Yanlan, Zhang; Jiaqi, An; Ao, Sun; Weifang, Chen (Acta Aerodynamica Sinica / Kongqi Donglixue Xuebao, 2026)