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논문 기본 정보

자료유형
학술저널
저자정보
Toru Yamahara (Tohoku University) Kazuhiro Nakahashi (Tohoku University) Hyoungjin Kim (Kyung Hee University)
저널정보
한국항공우주학회 International Journal of Aeronautical and Space Sciences International Journal of Aeronautical and Space Sciences Volume.18 Number.4
발행연도
2017.12
수록면
601 - 613 (13page)
DOI
10.5139/IJASS.2017.18.4.601

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초록· 키워드

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An adjoint-based error estimation and mesh adaptation study is conducted for two-dimensional viscous flows on unstructured hybrid meshes. The error in an integral output functional of interest is estimated by a dot product of the residual vector and adjoint variable vector. Regions for the mesh to be adapted are selected based on the amount of local error at each nodal point. Triangular cells in the adaptive regions are refined by regular refinement, and quadrangular cells near viscous walls are bisected accordingly. The present procedure is applied to single-element airfoils such as the RAE2822 at a transonic regime and a diamond-shaped airfoil at a supersonic regime. Then the 30P30N multi-element airfoil at a low subsonic regime with a high incidence angle (α=21deg.) is analyzed. The same level of prediction accuracy for lift and drag is achieved with much less mesh points than the uniform mesh refinement approach. The detailed procedure of the adjoint-based mesh refinement for the multi-element airfoil case show that the basic flow features around the airfoil should be resolved so that the adjoint method can accurately estimate an output error.

목차

Abstract
1. Introduction
2. Methodology
3. Flow and Adjoint Analysis
4. Results for Single-Element Airfoils
5. Results for Multi-Element Airfoils
6. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2018-558-001709895