Abstract
With the recent increase in the design of light and flexible structures, numerical investigations of fluid and structure together play a significant role in most engineering applications. Therefore, the current study presents an examination of fluid-structure interaction involving flexible structures. The problem is numerically solved by a commercial software ANSYS-Workbench. Two-way coupled three-dimensional transient simulations are carried out for the flexible flaps of different thicknesses in glycerin for a laminar flow and Reynolds number ranging from 3 < Re < 12. The bending line of the flaps is compared with experimental data for different alignments of the flaps relative to the fluid flow. The study reports the computation of the maximum tip-deflection and deformation of flaps fixed at the bottom and mounted normal to the flow. Additionally, drag coefficients for flexible flaps are computed and flow regimes in the wake of the flaps are presented. As well, the study gives an understanding on how the fluid response changes as the structure deforms and the model is appropriate to predict the behavior of thick and comparatively thinner flaps. The results are sufficiently encouraging to consider the present model for analyzing turbulent flow processes against flexible objects.
Highlights
Fluid-structure interaction (FSI) states the mutual interaction of a structure with a flowing fluid and develops the fluid and solid motions and the dependency of these motions on each other
Numerical calculations play an important role in most engineering areas and have become more challenging due to the prediction of different flow regimes which cannot be seen in experiments (EXP) but it is still a challenge to have accurate numerical simulation of a FSI problem because of strong fluid-structure coupling
FSI problems are ever present in nature for example flapping wings, flags [1,2,3,4,5,6,7,8,9], aquatic animals [10], flexible vegetation [11,12,13], in hemodynamics [1,14] and human hair and hair sensors [15]
Summary
Fluid-structure interaction (FSI) states the mutual interaction of a structure with a flowing fluid and develops the fluid and solid motions and the dependency of these motions on each other. A two-dimensional (2D) numerical study [26] presents the dynamic response of a flexible plate engrossed in laminar condition for Reynolds numbers of 100, 200, 400 and 800 by an immersed boundary method (IBM). A scheme that has treated the deflection line of single and tandem beam configurations is presented by Axtmann et al [32] It is attained by interacting both experiments and direct numerical simulations (DNS) for Reynolds numbers ranging from 1–60 in a viscous fluid. The focus of this study is to explore the motion of an elastic flap immersed in a rectangular fluid domain and to analyze the bending of flexible structures in 3D under laminar flow conditions.
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