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2025 Vol.30, Issue 2 Preview Page

Original Article

LARGE EDDY SIMULATION ON DAE-51 AIRFOIL FLOW AT LOW REYNOLDS NUMBER CONDITIONS

저 레이놀즈수 조건의 DAE-51 익형 유동에 대한 대와류모사

D. Park1†
박 동훈1†
1Department of Aerospace Engineering, Pusan National University
1부산대학교 항공우주공학과
*Corresponding Author
30 June 2025. pp. 141-169
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Abstract

A large eddy simulation (LES) has been performed to examine the flow over a DAE-51 airfoil at low Reynolds number conditions (less than 105). A grid dependency test was conducted to validate the reliability of the results and validate the feasibility of LES with the commercial code. The characteristics of the flow field were examined in detail, including the formation of a laminar separation bubble (LSB) and transition process at chosen angle of attack and Reynolds number. Criteria were established to identify laminar separation, transition onset, and reattachment points based on the mean shear stress along the airfoil surface. The variations in separation, transition onset, and reattachment points with changes in angle of attack and Reynolds number were investigated, and their impact on aerodynamic performance were evaluated. The position and length of LSB were found to significantly affect the distribution of pressure and skin friction coefficients on the airfoil surface, thereby influencing aerodynamic coefficients. Under low Reynolds number conditions, the formation, position, and length of LSB vary significantly with angle of attack, which complicates the drag polar pattern. As the Reynolds number decreases, the separation bubble or separated region lengthens, resulting in a substantial deterioration in the lift-to-drag ratio due to a significant increase in pressure drag.

Keywords
대와류 모사(Large eddy simulation)
저 레이놀즈수(Low reynolds number)
층류 박리 기포(Laminar separation bubble)
익형(Airfoil)
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Information
  • Publisher :Korean Society for Computational Fluids Engineering
  • Publisher(Ko) :한국전산유체공학회
  • Journal Title :Journal of Computational Fluids Engineering
  • Journal Title(Ko) :한국전산유체공학회지
  • Volume : 30
  • No :2
  • Pages :141-169
  • Received Date : 2025-05-19
  • Revised Date : 2025-06-04
  • Accepted Date : 2025-06-07
  • DOI :https://doi.org/10.6112/kscfe.2025.30.2.141
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