Lagrangian Vortex Dynamics in the Open Cavity Flow

• Published in: Hangkong Gongcheng Jinzhan Vol. 10; no. 5; pp. 691 - 697,734
• Main Authors: Han Shuaibin, Luo Yong, Zhang Shuhai
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Advances in Aeronautical Science and Engineering 01.10.2019
• Subjects: direct numerical simulation; lagrangian coherent structures; open cavity flow; vortex dynamics
• ISSN: 1674-8190
• DOI: 10.16615/j.cnki.1674-8190.2019.05.015

The open cavity flow contains various physical phenomena relating to vortex structures. The study on the vortex dynamics in the open cavity can provide theoretical insights into flow control and noise reduction. Direct numerical simulation is performed to obtain high order accuracy flow field of the open cavity. The vortex structures are identified using the Lagrangian coherent structures. Together with the Q-criterion and vorticity flux analysis, the formation, convection, impingement and split of the vortex in the cavity is studied and the dynamical characteristics are revealed. Results show that in a flow cycle, the rolling up and shedding of Lagrangian coherent structures at the leading edge corresponds to the formation and shedding of the vortex developed downstream; and at the trailing edge the split of Lagrangian coherent structures corresponds to the split of Q and Vortex. The main vortex in the cavity remains stable during the whole period of the flow.