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Direct numerical simulation of confined swirling jets |
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| Authors: | Nan Gui Jie Yan Jianren Fan |
| Institution: | 1. Department of Thermal Power Engineering, College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, P.R. China;2. Institute of Manned Space System Engineering, China Academy of Space Technology, Beijing, P.R. China;3. State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou, P.R. China |
| Abstract: | This study investigates the Lagrangian acceleration and velocity of fluid particles in swirling flows via direct numerical simulation. The intermittency characteristics of acceleration and velocity of fluid particles are investigated at different swirl numbers and Reynolds numbers. The flatness factor and trajectory curvature are used to analyse the effect of Lagrangian intermittency. The joint probability density function of Lagrangian acceleration and turbulence intensity is shown to explain the augmentation effect of Lagrangian intermittency by the strongly swirling levels under the relatively low intensity of turbulence. In addition, the correlation between the Lagrangian acceleration and the turbulence intensity is enhanced as the swirl level increases. It shows the important effect of swirl on the motion behaviour of fluid particles in the strongly swirling flows. |
| Keywords: | fluid particle swirling flow direct numerical simulation turbulence Lagrangian intermittency |