Abstract
ἀ e C9 parachute was the research object in this work and was studied by using a fluid-structure interaction method and CFD method. An arbitrary Lagrangian-Eulerian method, a kind of fluid-structure interaction method, was used to simulate the inflation process. ἀ e dynamic relationship between canopy shape and flow field was obtained. ἀ e canopy shape in a stable phase was exported and was transformed into the porous media domain. ἀ en the flow around the canopy shape was simulated by the CFD method we used based on the k-ε turbulence model. ἀ e experiments verified the accuracy of structural change and the feasibility of the porous media model. ἀ e arbitrary Lagrangian-Eulerian method not only can obtain the dynamic results of structure and flow field but also can provide a more accurate bluff body for further CFD analysis. ἀ e CFD method based on porous media and the turbulence model can obtain more detailed and accurate flow field results, which can be used as a complement to fluid-structure interaction analysis. ἀi s mixed method can improve the accuracy of analysis and be useful for other permeable fabric research.
Highlights
A p arachute i s a n im portant aer odynamic de celerator and is widely used in aviation, aerospace, weaponry, and other areas. ἀ e working style is simple, but t he inflation i s a t ypical interaction of s tructure a nd fluid t hat is a complex transient and nonlinear process (Yu, Ming 2007; Potvin et al . 2011)
Fluid-structure in teraction (FS I) m ethods, w hich are a pplied in aer odynamic de celerator sys tem (ADS) research, have developed rapidly over the past few years. ἀ e r epresentatives a re a rbitrary L agrangian-Eulerian (ALE) method (Coquet et al 2011; Tutt et al 2011), the immersed b oundary (IB) m ethod (K im, P eskin 2009), etc. (Kenji 2012; P otvin et al 2011)
There exists a smaller velocity vector in porous media domain, which indicates weak airflow through the canopy surface. ἀ e weak airflow and the airflow around the canopy produce a small eddy near the canopy surface. ἀ e direction is opposite to the big eddy that is produced in the upper flow field of the parachute
Summary
Present position: professor and doctoral tutor in College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics. Present position: professor and doctoral tutor in Beijing Institute of Space Mechanics & Electricity, China Academy of Space Technology. Research interests: spacecraft ADS design, ἀuid structure interaction, EDL design and simulation. Present position: ADS design engineer at Beijing Institute of Space Mechanics & Electricity, China Academy of Space Technology
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