항공우주시스템공학회지 (Journal of Aerospace System Engineering)

  • 제13권6호
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  • Pages.1-8
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  • 2019
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  • 1976-6300(pISSN)
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  • 2508-7150(eISSN)
항공우주시스템공학회 (The Society for Aerospace System Engineering)
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LES을 이용한 후향 계단 유동에서의 Synthetic turbulence 효과 연구

Synthetic Turbulence Effect in Subsonic Backward Facing Step Flow Using LES

  • 안상훈 (한국항공대학교, 항공우주 및 기계공학과) ;
  • 성홍계 (한국항공대학교, 항공우주 및 기계공학부)
  • Ahn, Sang-Hoon (Department of Aerospace Engineering, Korea Aerospace University) ;
  • Sung, Hong-Gye (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • 투고 : 2019.06.10
  • 심사 : 2019.10.25
  • 발행 : 2019.12.31
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초록

아음속 유동이 흐르는 후향 계단에서, 입구 경계면에서의 난류를 모사하는 3가지 기법을 조사하였다. 입구 경계면으로 유입되는 평균 유동장과 레이놀즈 응력 프로파일은 실험에서 측정된 결과를 사용하였으며, 입구 경계면의 난류 유동 모사기법으로 synthetic eddy method(SEM), 무작위 변동(random noise) 그리고 균일한 유동 조건(uniform)을 사용하였다. 3차원 유동장의 난류 유동의 모사를 위해 대와동모사(Large Eddy Simulation, LES)를 적용하였다. 3가지 기법에 대한 입구 경계면으로 유입된 유동의 난류 특성과 유동의 재 부착(reattachment) 거리와 속도, 레이놀즈 응력(Reynolds stress)을 비교하였다.

The synthetic turbulence generation model for inlet boundary conditions of subsonic Backward Facing Step (BFS) was investigated. The average u-velocity and Reynolds stress at inlet boundary follows experimental data. Synthetic Eddy Method (SEM), random noise, and uniform flow conditions were implemented relative to the synthetic turbulence generation method. A three dimensional Large Eddy Simulation (LES) was applied for turbulent flow simulation. Turbulent and mean flow characteristics such as flow reattachment length, velocity profiles, and Reynolds stress profiles of BFS were compared with respect to the turbulent effects.

키워드

참고문헌

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