Simulation of Parachute Fluid Structure Interaction in Supersonic Flow

Lingard, J. Stephen; Darley, Matt

doi:10.2514/6.2005-1607

Cited by 33 publications

(15 citation statements)

References 4 publications

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“…This commercial finite element analysis tool allows solving FSI problems using a coupling code. Taylor, Tutt and their colleagues 6-11 as well as Lingard and his team [12][13][14] have also applied it to parachutes systems. This second FSI method, in which the structural and the fluid responses are calculated simultaneously in a single code, is often referred as monolithic approach.…”

Section: Introductionmentioning

confidence: 99%

Improvements in Fluid Structure Interaction Simulations of Parachutes Using LS-Dyna®

Coquet¹,

Bordenave²,

Capmas

et al. 2011

21st AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

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The French Ministry of Defence's procurement agency, the Direction Générale de l'Armement (DGA), is in charge of assessing and testing armament systems in order to equip the armed forces and prepare for the future. DGA Aeronautical Systems, the technical centre dedicated to evaluate and test aircraft, combines test and evaluation to clear, among others, parachute systems. The parachute evaluation is historically based on experimental data and so requires numerous flight tests which can prove expensive and time consuming. In order to have a greater understanding of the parachute dynamic behavior and to optimize the parachute systems flight tests, DGA Aeronautical Systems developed a modeling and simulation capability as a support to evaluation. For this purpose, DGA Aeronautical Systems, with the help of ISAE, developed Fluid Structure Interaction (FSI) simulations of parachutes using the LS-Dyna commercial Finite Element Analysis (FEA) tool. This tool is largely used for solving highly nonlinear transient problems and enables doing coupled multi-physics simulations such as FSI simulations. DGA Aeronautical Systems has been using the software since 2003. In the recent years, the parachute simulation has been much improved thanks to the implementation of a porosity algorithm in LS-Dyna at the common request of DGA and parachute industry. The paper presents recent improvements in Arbitrary Lagrangian Eulerian (ALE) techniques used to analyze the canopy inflation and the quasi-steady state descent phases characteristics. Up to now, only infinite mass type simulations were developed by constraining the parachute confluence point and applying a prescribed airflow to the fluid. The applied airflow velocity came from real in-flight measurements of paratrooper or load trajectory determinations. This simulation type is representative to wind tunnel tests. From now on, thanks to considerable computational resources, finite mass type simulations are also possible. It consists in applying the force of gravity to the parachute system. This allows simulating both the inflation phase (from vertical packed parachute geometry) and the quasi-steady state descent. Among others, the static line parachute of the new French Army troop parachute system called EPC (Ensemble de Parachutage du Combattant) was modeled at real scale. Modeling techniques are presented and results of the EPC static line parachute simulation are compared with real inflight measurements. The benefits of FSI simulations prior to parachute testing are presented. In a near future, incompressible and compressible Navier-Stokes solvers will be available in the next version of LS-Dyna. These code enhancements will be tested to simulate the parachute flight and hopefully will bring the ability to analyze more accurately the aerodynamics of the canopy and the structural behavior of the fabrics. These future capabilities are also discussed.

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Section: Introductionmentioning

confidence: 99%

Improvements in Fluid Structure Interaction Simulations of Parachutes Using LS-Dyna®

Coquet¹,

Bordenave²,

Capmas

et al. 2011

21st AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

View full text Add to dashboard Cite

show abstract

“…Tutt and Taylor used the Euler-Lagrange penalty algorithm to simulate the inflation process of a flat circular parachute [19]. en, they applied a new Euler-Lagrange coupling algorithm to introduce the permeability into the FSI simulation and simulated the inflation performance of the disk-gap-band parachute for supersonic Mars exploration under the influence of the wake of capsule [20][21][22][23]. Subsequently, they simulated the inflation process of a flat circular parachute in a finite mass scenario and conducted a series of indoor vertical parachute tests to verify the simulation results [24].…”

Section: Introductionmentioning

confidence: 99%

Study on Transient Dynamics and Aerodynamic Characteristics of a New Type of High-Damping Four-Winged Rotating Parachute Inflation Process

Jiang

Mao

et al. 2020

Mathematical Problems in Engineering

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To decrease the opening shock as well as improve the resistance coefficient and stability of the parachute of aviation weapon under subsonic conditions, a new kind of high-damping four-winged rotating (HFWR) parachute is investigated in this paper. e transient dynamic behavior and aerodynamic characteristics of the parachute during the inflation process are studied. Considering the permeability, the 3D folded finite element (FE) model of the HFWR parachute is established based on the direct folding modeling technique, and the inflation process of the parachute under subsonic flow is simulated using the multimaterial arbitrary Lagrange-Euler (ALE) method. A series of wind tunnel tests are conducted to verify the numerical results. Besides, the opening performances of the HFWR parachute and the round parachute, which includes the inflation process, the dynamic response of the swing angle, and the opening shock load varying with time, are compared under the same conditions. e results show that the opening performance of the HFWR parachute is superior to the round parachute under specific military background. e fluid-structure interaction (FSI) simulation results show good consistency with the wind tunnel tests, which indicates that the numerical modeling can effectively simulate and predict the opening performance and aerodynamic characteristics of the rotating parachute. e modeling method in this paper can help shorten the development cycle, improve the cost effectiveness, and optimize the design of the parachute.

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“…Tutt et al built the airflow model based on Eulerian algorithm and obtained the inflation characteristics of parachute through ALE algorithm [4][5][6]. Lingard et al demonstrated the stimulation and analysis of parachute performance in supersonic flow, highlighting the numerical modeling of parachute and airflow and airflow mesh generation [7][8]. Jia He et al and Cheng Han et al studied the kinematics of parachute inflation process and surrounding flow field, providing parameters of parachute and flow field variations during parachute inflation process [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Analysis of the Wind Field inside the Air Deflector of a Sugarcane Leaf Cutting and Returning to Field Machine

Xu¹,

Wang²,

Zhen³

et al. 2016

Proceedings of the 2016 International Conference on Civil, Structure and Environmental Engineering

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This work investigated the self-excited wind field caused by rotating knife rollers inside the air deflector during the operation of the sugarcane leaf cutting and returning to field machine. Based on the arbitrary Lagrangian-Eulerian (ALE) method, a fluid-structure interaction simulation of wind field inside the air deflector was carried out under the condition of two clockwise rotating knife rollers, exploiting the finite element software LS-DYNA．The simulation results revealed an airflow confluence surface generated during the process of the airflow interaction, accompanied by formation of vortices. The wind field in the left and right outlets of the air deflector and regions near the ground between the two knife rollers is regular and stable. Airflow velocities below the deflector near the ground were measured. With both simulation and experimental evidences, we demonstrate that the horizontal wind velocity decreases with an increasing elevation above the ground, with a simulation deviation of velocity decreasing rate no more than 12%. In contrast, the vertical wind velocity shows an opposite correlation with height, and the simulation deviation of velocity increasing rate is no more than 26%. Our simulation and experimental data indicate a consistent variation trend of wind velocity. Insights from this study can be useful in designing and optimization of relevant structures and mechanisms involving air deflectors and knife rollers.

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Simulation of Parachute Fluid Structure Interaction in Supersonic Flow

Cited by 33 publications

References 4 publications

Improvements in Fluid Structure Interaction Simulations of Parachutes Using LS-Dyna®

Improvements in Fluid Structure Interaction Simulations of Parachutes Using LS-Dyna®

Study on Transient Dynamics and Aerodynamic Characteristics of a New Type of High-Damping Four-Winged Rotating Parachute Inflation Process

Simulation and Experimental Analysis of the Wind Field inside the Air Deflector of a Sugarcane Leaf Cutting and Returning to Field Machine

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