GCI와 벽면격자거리를 고려한 2차원 분사유동의 검증

VERIFICATION OF 2D INJECTION FLOWS WITH GCI AND NEAR-WALL GRID LINE SPACINGS

  • 원수희 (서울대학교 대학원 항공우주공학과) ;
  • 정인석 (서울대학교 항공우주공학과) ;
  • 최정열 (부산대학교 항공우주공학과)
  • 발행 : 2005.10.01

초록

The flowfields generated by gaseous slot injection into a supersonic flow at a Mach number of 3.75 and a Reynolds number of $2.07{\times}10^7$ are simulated numerically. Fine-scale turbulence effects are represented by a two-equation(k-w SST model) closure model which includes $y^+$ effects on the turbulence model. Grid convergence index(GCI) is also considered to provide a measure of uncertainty of the grid convergence. Comparison is made with experimental data and other turbulence model in term of surface static pressure distributions, the length of the upstream separation region, and the penetration height. Results indicate that the k-w SST model correctly predicts mean surface pressure distribution and upstream separation length. However, it is also observed that the numerical simulation over predicts the pressure spike and penetration height compared with experimental data. All these results are taken within $1\%$ error band of grid convergence.

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