A Coupled Fluid-Structure Parachute Inflation Model

Johari, Hamid; Desabrais, Kenneth J.

doi:10.2514/6.2003-2146

Cited by 9 publications

(11 citation statements)

References 10 publications

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“…The canopy is made from eight gores, and the suspension line length is 0.75 m. The following assumptions are made: (1) the air permeability is zero; (2) the initial canopy shape is assumed by referring to experiments; (3) the effect of gravity is ignored; (4) two-dimensional axisymmetric model is adopted [6][7][8][9][10][11]. In order to computer the flow field around the canopy, the standard k-ε turbulent model is used.…”

Section: Computational Fluid Dynamics Modelmentioning

confidence: 99%

“…Second, the flow field around canopy turns to be very complex with significant turbulence inside the canopy and large flow separation outside the canopy, meanwhile some airflow passes through the chute porosity, and all these are difficult to deal with. Third, the complexity of the problem arises mainly from the fact that the flow field and the canopy shape are interactive, and thus this is also a complex problem involving fluid structure interaction [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Because the canopy experiences a large deformation during the inflation process which lasts only a short time, it would also be difficult to get the velocity and pressure distributions around the canopy by experiments on parachute opening process. Therefore, numerical simulation methods are adopted to investigate the opening process as many scholars did [6][7][8][9][10][11][12][13][14]. The parachute research abroad based on the Fluid Structure Interaction (FSI) method was developed early in the 1990s [6][7][8][9][10], however, little information about models and simulation results can be acquired because of confidentiality and other reasons.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, numerical simulation methods are adopted to investigate the opening process as many scholars did [6][7][8][9][10][11][12][13][14]. The parachute research abroad based on the Fluid Structure Interaction (FSI) method was developed early in the 1990s [6][7][8][9][10], however, little information about models and simulation results can be acquired because of confidentiality and other reasons. In China, the FSI research on parachute began just two or three years ago, however, focuses were mainly laid on one or another aspect of the flow or the structure [11][12][13][14], and experimental results were absent or insufficient for validation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study on transient aerodynamic characteristics of parachute opening process

Xiao

2007

Acta Mech. Sin.

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In the research of parachute, canopy inflation process modeling is one of the most complicated tasks. As canopy often experiences the largest deformations and loadings during a very short time, it is of great difficulty for theoretical analysis and experimental measurements. In this paper, aerodynamic equations and structural dynamics equations were developed for describing parachute opening process, and an iterative coupling solving strategy incorporating the above equations was proposed for a small-scale, flexible and flat-circular parachute. Then, analyses were carried out for canopy geometry, time-dependent pressure difference between the inside and outside of the canopy, transient vortex around the canopy and the flow field in the radial plane as a sequence in opening process. The mechanism of the canopy shape development was explained from perspective of transient flow fields during the inflation process. Experiments of the parachute opening process were conducted in a wind tunnel, in which instantaneous shape of the canopy was measured by high velocity camera and the opening loading was measured by dynamometer balance. The theoretical predictions were found in good agreement with the experimental results, validating the proposed approach. This numerical method can improve the situation of strong dependence of parachute research on wind tunnel tests, and is of significance to the understanding of the mechanics of parachute inflation process.

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Section: Computational Fluid Dynamics Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on transient aerodynamic characteristics of parachute opening process

Xiao

2007

Acta Mech. Sin.

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“…These investigations are involved with semiempirical models combining theoretical (i.e., analytical or numerical), and experimental data to gain an insight into the subject. Although recent research takes benefit from high speed computing facilities to obtain more accurate simulations (e.g., [1][2][3][4]), the phenomena are still lacking in a physical understanding because of simplifications imposed to the models. This has caused, at least for a short-term scope, more reliance on experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Decisive Roll of Filling Time on Classification of Parachute Types

Mohaghegh¹,

Jahannama²

2008

Journal of Aircraft

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In a low altitude recovery, a parachute has to reduce the recovery mass velocity to a predefined velocity before its ground impact within a vertical distance as low as possible. The article classifies various parachutes based on the parachute opening shock and distance necessary to satisfy the steady descent condition in an unreefed situation using numerical solutions of experimental and theoretical relations linked with the parachute opening and flight dynamics. Results show that the parachute filling time is the main parameter to differentiate all parachutes from each other. Based on the parachute filling time, slotted parachutes velocity history coverage locates between ribbon and ringsail parachutes, whereas solid textile parachutes span a range between extended skirt 14.3% and guide surface parachutes. In each group, a decrease in the parachute filling time as a result of the change in the parachute type causes an increase in the parachute opening shock as well as a decrease in the parachute steady distance.parachute drag force F max = opening shock g = gravity acceleration m = total recovery mass n = parachute filling parameter R m = mass ratio t = elapsed time t f = parachute filling time V = velocity X p = parachute shock reduction factor x = parachute filling distance = correlation coefficient = power of filling function = correlation exponent = air density Subscripts O = opening instant p = projected t = instant 0 = nominal

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Fluid-Structure Interaction Analysis of Parachute Finite Mass Inflation

Gao

Zhang

Qian

2016

International Journal of Aerospace Engineering

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Parachute inflation is coupled with sophisticated fluid-structure interaction (FSI) and flight mechanic behaviors in a finite mass situation. During opening, the canopy often experiences the largest deformation and loading. To predict the opening phase of a parachute, a computational FSI model for the inflation of a parachute, with slots on its canopy fabric, is developed using the arbitrary Lagrangian-Euler coupling penalty method. In a finite mass situation, the fluid around the parachute typically has an unsteady flow; therefore, a more complex opening phase and FSI dynamics of a parachute are investigated. Navier-Stokes (N-S) equations for uncompressible flow are solved using an explicit central difference method. The three-dimensional visualization of canopy deformation as well as the evolution of dropping velocity and overload is obtained and compared with the experimental results. This technique could be further applied in the airdrop test of a parachute for true prediction of the inflation characteristics.

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A Coupled Fluid-Structure Parachute Inflation Model

Cited by 9 publications

References 10 publications

Study on transient aerodynamic characteristics of parachute opening process

Study on transient aerodynamic characteristics of parachute opening process

Decisive Roll of Filling Time on Classification of Parachute Types

Fluid-Structure Interaction Analysis of Parachute Finite Mass Inflation

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