Abstract
The motion of fluid consists of different scales of coherent vortical structures. These vortical structures determine the characteristics of fluid motion and are key to understand fluid dynamics. In this paper, we study the fine control method of vortical structures based on the Liutex force field model. This is achieved by constructing a source term using Liutex and directly add it to the Navier-Stokes equations. To investigate the influence of the constructed Liutex force model on vortical structures, a flow past a cylinder at Reynolds number of 100 is numerically studied with different source term magnitude and region. The drag and lift forces on the cylinder, as well as the flow field near and behind the cylinder are compared and analyzed. Results show that Liutex force model can effectively strengthen or weaken the vortical structures based on different purpose.
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Acknowledgment
Communications with Profs. Lian-di Zhou and Zheng Ma are highly appreciated.
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Project supported by the National Natural Science Foundation of China (Grant Nos. 51909160, 51879159), the National Key Research and Development Program of China (Grant Nos. 2019YFB1704200, 2019YFC0312400).
Biography
Wei-wen Zhao (1990-), Male, Ph. D., Assistant Professor, E-mail: weiwen.zhao@sjtu.edu.cn
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Zhao, Ww., Wang, Yq., Chen, St. et al. Parametric study of Liutex-based force field models. J Hydrodyn 33, 86–92 (2021). https://doi.org/10.1007/s42241-021-0014-z
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DOI: https://doi.org/10.1007/s42241-021-0014-z