2차원 밀폐 캐비티의 고레이놀즈수 흐름에 관한 연구

A Study on High Reynolds Number Flow in Two-Dimensional Closed Cavity

  • 최민선 (목포해양대학교 기관공학과) ;
  • 송치성 (한국기계연구원 산업기계설계부) ;
  • 이영호 (한국해양대학교 기계시스템공학부)
  • 발행 : 1996.06.01

초록

Two-dimensional lid-driven closed flows within square cavity were studied numerically for four Reynolds numbers : $10^4$, 3$\times10^4$, 5$\times10^4$ and 7.5$\times10^4$. A convective difference scheme to maintain the same spatial accurary by irregular grid correction is adopted by applying the interior division principle. Grid number is $80\times80$and its minimum size is about 1/400 of the cavity height. At Re=$10^4$, periodic migration of small eddies appearing in corner separation region and its temporal sinusoidal fluctuation are represented. At three higher Reynolds numbers(3$\times10^4$, 5$\times10^4$ and 7.5$\times10^4$), an organizing structure of four consecutive vorticles at two lower corners is revealed from time-mean flow patterns. But, instantaneous flow characteristics show very random unsteady fluctuation mainly due to the interaction between rotating shed vortices and stationary eddies within the corners.

키워드

참고문헌

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