Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Effects of Uniform and Turbulent Inflow Conditions on Wake Topology and Vortex Growth Behind a Ramp

균일 및 난류 입구조건이 램프 후류 형상 및 성장에 미치는 영향

  • Lokesh Kalyan Gutti (School of Mechanical Engineering, Pusan National University) ;
  • Mustafa Z. Yousif (School of Mechanical Engineering, Pusan National University) ;
  • Hee-Chang Lim (School of Mechanical Engineering, Pusan National University)
  • Received : 2023.05.10
  • Accepted : 2023.07.11
  • Published : 2023.07.31
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Abstract

This work is to observe the wake flow generated behind a ramp. We have conducted a large eddy simulation with two ramp models having different heights with two different inflow conditions. Reynolds number based on the height of the large ramp (LR) and small ramp (SR) are Reh = 2.8×104 and 1.4×104 respectively. The wake flow visualization shows the formation of streamwise counter-rotating vortices pairs at the downstream of the obstacle. These primary vortices are stretched and lifted up when moving downstream. In order to observe the effect of the inflow condition on the wake transition, two different inlet flow conditions are given on the inlet section as an inlet boundary condition. Induced counter-rotating vortices pairs due to sharp-edged triangular ramp obstacles are developed and propagated downstream. In the result, the large ramp shows a more complicated wake structure of the boundary layer than the small ramp.

Keywords

Acknowledgement

이 논문은 2021년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원(20214000000140, 청정에너지 융합 발전 융합대학원과 2019년도 정부(교육부)의 재원으로 2019(한국연구재단)의 지원을 받아 수행된 연구임(2019R1I1A3A01058576, 공학기술기반의 격리챔버 내 극한압력 생성 및 다물리해석)

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