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Reconfiguration of bio-inspired poroelastic cluster
Minhyeong Lee(이민형),Ehsan Mahravan,Daegyoum Kim(김대겸) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Plumed seeds, such as dandelion or milkweed seeds, can fly a distance of kilometers while other types of wind-dispersal seeds disperse a few hundred meters at maximum. The plumed seed consists of many microscopically thin and elastic plumes, and it is well known that this porous structure enables superior flight performance. Although the effects of porosity have been of interest recently, it remains unexplored how the elastic deformation of individual plumes and the resulting reconfiguration of the whole seed change aerodynamic loading. In this study, we numerically examine the effect of elasticity on reconfiguration and drag force for a porous cluster of elastic cylinders, by adopting simplified two-dimensional models. In contrast to common plants or elastic fins that streamline and reduce drag forces when subjected to a fluid flow, the poroelastic cluster reconfigures to enlarge the frontal area and therefore increases the total drag force.
Reconfiguration of bio-inspired poroelastic cluster
Minhyeong Lee(이민형),Ehsan Mahravan,Daegyoum Kim(김대겸) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Plumed seeds, such as dandelion or milkweed seeds, can fly a distance of kilometers while other types of wind-dispersal seeds disperse a few hundred meters at maximum. The plumed seed consists of many microscopically thin and elastic plumes, and it is well known that this porous structure enables superior flight performance. Although the effects of porosity have been of interest recently, it remains unexplored how the elastic deformation of individual plumes and the resulting reconfiguration of the whole seed change aerodynamic loading. In this study, we numerically examine the effect of elasticity on reconfiguration and drag force for a porous cluster of elastic cylinders, by adopting simplified two-dimensional models. In contrast to common plants or elastic fins that streamline and reduce drag forces when subjected to a fluid flow, the poroelastic cluster reconfigures to enlarge the frontal area and therefore increases the total drag force.
Dynamic interaction between a poroelastic cluster and unsteady flows
Minhyeong Lee(이민형),Ehsan Mahravan,Daegyoum Kim(김대겸) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Plumed seeds like dandelion or milkweed seeds are the most representative poroelastic cluster in nature. Owing to their extraordinary flight performance superior to other types of wind-dispersal seeds, the aerodynamics of plumed seeds has drawn substantial academic attentions in the field of fluid-structure interaction. Aerodynamic roles of porosity and elasticity during the steady flight of poroelastic seed is well known. However, although dynamic response under the flow also significantly affects the flight for all fliers, how the freely flying poroelastic cluster dynamically interact with the unsteady flow still remains elusive. In this study, we numerically investigate the dynamic interaction between poroelastic clusters and unsteady flows by adopting simplified two-dimensional models with various porosity and elasticity.