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CFD Analysis of EFD-CFD Workshop Case 3 using Commercial and Open Source CFD codes

상용 및 오픈소스 CFD 코드를 이용한 EFD-CFD 워크샵 Case 3 해석

  • Received : 2016.11.06
  • Accepted : 2017.01.17
  • Published : 2017.03.01

Abstract

Computational fluid dynamics analysis was performed for the case 3 of the EFD-CFD workshop. Solvers were used for three commercial CFD codes(Star-CCM+, Fluent and CFX) and an open source CFD code(SU2). The grid were generated four types depending on the total cells using commercial grid generation code(Pointwise). Mach number of 0.4 and 0.8, 2 degree angle of attack and Mach number of 0.9, 1 degree angle of attack were calculated. Similar pressure coefficient curve and normal force coefficient were showed from the coarse grid to fine grid of four codes. But there is a difference in the drag coefficient. The position of the shock wave was predicted forward as the discretization order increased in calculations using Star-CCM+ and Fluent. The computation time to converge, Fluent, Star-CCM +, CFX are in order, and SU2 takes much time to converge.

EFD-CFD 워크샵 중 Case3인 RAE Wing A 형상에 대해 전산유체역학 해석을 수행하였다. 해석자로 3개의 상용 CFD 해석 코드(Star-CCM+, Fluent, CFX)와 오픈 소스 CFD 코드(SU2)를 사용하였다. 격자는 상용 격자 생성 코드인 Pointwise를 이용하여 격자의 수에 따라 4가지를 생성하였다. 마하수 0.4, 0.8에서 는 받음각 2도, 마하수 0.9에서 받음각 1도에서 해석하였다. coarse격자부터 fine 격자까지는 압력계수 곡선과 수직력 계수는 비슷한 결과를 보였으나 항력 계수에서는 차이가 있었다. Star-CCM+과 Fluent의 해석에서 차분법의 차수가 높을수록 충격파의 위치를 앞으로 예측하였다. 수렴에 다다르는 계산시간은 Fluent, Star-CCM+, CFX의 순으로 나타났고 SU2는 이에 비해 수렴하는데 많은 시간이 들었다.

Keywords

References

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