엔트로피 수정 기법을 이용한 HIFiRE-1 모델의 극초음속 층류 및 난류 경계층 수치해석

Abstract

This study presents a case study of hypersonic laminar and turbulent boundary layers on the HIFiRE-1 model, proposed as a benchmark in the 2024 High-Fidelity CFD Verification Workshop. Computations were initially performed with the Roe flux-differencing scheme, but non-physical carbuncle phenomena appeared near the cone nose. To improve numerical stability, an entropy fix was applied by modifying the eigenvalues comprising the dissi- pation term. The improved simulation captured key shock structures and showed good agreement with reference data including surface pressure and heat flux. The turbulent heat flux is up to four times higher than in the laminar one, highlighting the impact of the boundary layer state on the aerothermodynamics of a high-speed vehicle.