A further study of inverted hydrodynamic drafting for flow past two flexible filaments in tandem arrangement. (2018)

• Record Type: Journal Article
• Authors: Xie, Fangfang; Deng, Jian
• Is Part Of: Progress in computational fluid dynamics. Volume 18:Number 3(2018)
• Page Start: 164
• Page End: 176
• Publication Date: 2018
• Subjects: fluid-structure interaction -- flexible filaments -- inverted hydrodynamic drafting; Fluid dynamics -- Data processing -- Periodicals; Fluid dynamics -- Mathematics -- Periodicals; 620.10640285
• Languages: English
• ISSNs: 1468-4349

Abstract

Two tandem filaments in a uniform flow are simulated by using a penalty immersed boundary method. First, we investigate two identical filaments, duplicating the 'inverted drafting'. We then fix the structural parameters of the leader while vary that of the follower in k b 2 and ρ s 2 . It is found as the follower is stiffer or lighter than the leader, the follower flaps in larger amplitude than the leader. While the drag force acting on the follower is lower than that of the leader, which is in conflict with the so-called 'inverted drafting'. However, if we compare the dynamics of the follower to that of an isolated filament with the same structural properties, the 'inverted drafting' holds again. Furthermore, we investigate the characteristic of energy transfer between filaments and their surrounding fluid. The correlation parameter Clv indicates the follower extracts more energy than the leader except for the cases with ρ s 2 ≤ 0.2.