경사진 벽충돌 디젤 분무에 대한 수치해석에서 오류확산이 미치는 영향Analysis of the False Diffusion Effects in Numerical Simulation of Diesel Spray Impinging on Inclined Walls
- Authors
- 권혁록; 이성혁
- Issue Date
- 2008
- Publisher
- 한국액체미립화학회
- Keywords
- False Diffusion; Impinging Sprays; Spray Penetration Length; Inclined Wall; 오류확산; 충돌분무; 분무침투거리; 경사진 벽
- Citation
- 한국액체미립화 학회지, v.13, no.1, pp 22 - 27
- Pages
- 6
- Journal Title
- 한국액체미립화 학회지
- Volume
- 13
- Number
- 1
- Start Page
- 22
- End Page
- 27
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/31010
- ISSN
- 1226-2277
- Abstract
- The false diffusion occurs generally when the flow is oblique to the grid lines and when there is a non-zero gradient of the dependent variable in the direction normal to the flow. This numerical problem can overestimate diffusion terms in the continuous phase, causing the numerical inaccuracy for the simulation of impinging sprays on inclined walls because most of spray calculation uses rectangular grid system. Therefore, the main objective of this article is to investigate numerically the influence of false diffusion on numerical simulation for spray-wall impingement on inclined walls. It is found that unlike the spray impingement normal to the wall, the numerical diffusion exists in the case when diesel sprays impinge on the inclined walls with different angles. The results show that the correction function should be considered for accurate prediction of spray penetration length and more elaborate numerical schemes should be utilized to reduce the false diffusion.
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